Doug Ingraham
Jul 01, 1996, 01:00 AM
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<title>Speed 400 Motor Analysis Pt 2</title>
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<pre>This is part 2 of my look at speed 400 motors and how they can be used. In
this part I am focusing on 7 cell operation with gear reduction. The goal
of this part is to characterize those setups usable for Limited Motor Run
(LMR). I include only data for the Graupner and Aeronaut folding props
and I limit the ranges to those appropriate for that motor. (There is
one Robbe prop that got included as well.)
First lets look at just the motors when operated on 7 cells.
Graupner Speed 400 7.2V on 7 Sanyo 500AR cells.
BEST 3.2 Amps 8.2 MTV 10516 RPM 18.3 Wo 71.1% 570 secs
MAX 9.0 Amps 7.7 MTV 6217 RPM 34.9 Wo 49.8% 199 secs
Graupner Speed 400 6.0V on 7 Sanyo 500AR cells.
BEST 5.8 Amps 8.0 MTV 14839 RPM 34.3 Wo 73.6% 307 secs
MAX 16.4 Amps 7.2 MTV 8842 RPM 63.4 Wo 54.0% 110 secs
Graupner Speed 400 4.8V on 7 Sanyo 500AR cells.
BEST 7.3 Amps 7.8 MTV 20894 RPM 43.3 Wo 75.2% 246 secs
MAX 20.2 Amps 6.9 MTV 12499 RPM 78.7 Wo 56.5% 89 secs
The 4.8 volt motor is clearly the BEST when it comes to getting the power
out most efficiently. The MAX power levels are also clearly wrong for
both the 6V and 4.8V motor. I would not suggest trying to run the 6V
motor over 12 amps unless it is timed perfectly and the brushes are fully
seated. The same goes for the 4.8 volt motor but set the amp limit to 14
amps. Even these numbers might be a little high, especially if you are
trying to make a 2 minute motor run.
On 7 cells the 7.2V motor will put out a maximum of 34.9 watts and the
other motors have no trouble putting almost twice this much so there is
no reason at all to even think about using it on 7 cells. For that reason
I didn't include the tables here because they would just add confusion.
The gear ratios explored are 1.50, 1.72, 1.85, 2.30, 2.33, 2.60, 3.7,
4.00, 5.25, and 5.90 reduction ratios that are listed in the Hobby Lobby
catalog as usable with Speed 400 motors. The 2.30 and 2.33 might be the
same but since they were listed this way I computed them this way. The
3.7 ratio is from the Robbe Planeta speed 400 planetary gearbox. I
didn't include any amp draws less than 9 for the 6V motor or greater than
14 because it is impractical. On the 4.8 volt motor the bottom range is
still 9 amps but the top is 15 amps. Again I don't believe the motor
will do this for very long because the brushes heat up very quickly and
then the brush resistance skyrockets which causes the current to drop.
The 500AR cells were selected because they will give a full power
duration of 2 minutes at currents of 15 amps which is more than is
practical with these motors.
When selecting a size you need to consider more than just using the
largest prop. Even before that you have to look at if the prop will
clear your wing. I have props I can't put on my Timothy because the nose
is too short and the prop hits the wing. The other thing to consider is
the speed of flight of the plane. You are probably not going to have
enough power to go straight up so you will have to fly the plane up on
the wing. Because of this you will need to consider the speed that the
plane has to fly in order to get a good rate of climb. The largest prop
is not going to be a very fast prop. The plane may fly ok but not climb
very fast. Tremendous thrust doesn't fly planes. Airspeed is what flies
planes. You may have to try a couple of props to get what you want. I
would err on the side of too much speed rather than not enough.
Now the data and some comments will follow.
-------------------------------------------------------------------------------
Graupner Speed 400 6.0V geared (1.50:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 6.0x6.0 7.5 11.6 11584 87.1 57.3 65.8% 66 mph 156 sec
GR 7.0x3.0 7.6 11.2 11807 84.5 56.3 66.6% 34 mph 161 sec
Graupner Speed 400 6.0V geared (1.72:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 6.0x6.0 7.7 9.5 11138 72.9 50.9 69.8% 63 mph 190 sec
GR 7.0x3.0 7.7 9.1 11317 70.4 49.6 70.4% 32 mph 197 sec
AN 7.0x6.0 7.4 12.6 9560 94.3 59.8 63.4% 54 mph 142 sec
Graupner Speed 400 6.0V geared (1.85:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 8.0x4.5 7.4 12.8 8823 95.2 60.0 63.1% 38 mph 141 sec
AN 7.0x6.0 7.5 11.5 9420 86.7 57.2 66.0% 54 mph 156 sec
AN 8.0x5.0 7.4 13.4 8564 98.8 61.0 61.8% 40 mph 135 sec
Graupner Speed 400 6.0V geared (2.30:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 8.0x4.5 7.7 9.4 8344 72.6 50.8 69.9% 36 mph 190 sec
GR 8.0x6.0 7.6 10.9 7808 82.5 55.5 67.2% 44 mph 165 sec
GR 9.0x5.0 7.5 12.4 7246 92.6 59.2 64.0% 34 mph 145 sec
AN 8.0x5.0 7.6 10.0 8150 76.2 52.6 69.0% 38 mph 181 sec
AN 9.0x5.0 7.5 12.4 7246 92.6 59.2 64.0% 34 mph 145 sec
AN 9.0x6.5 7.4 13.8 6729 101.5 61.6 60.7% 41 mph 130 sec
AN 9.5x5.0 7.4 13.5 6818 100.0 61.3 61.3% 32 mph 133 sec
Graupner Speed 400 6.0V geared (2.33:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 8.0x4.5 7.7 9.2 8306 71.3 50.1 70.2% 35 mph 194 sec
GR 8.0x6.0 7.6 10.7 7781 81.2 54.9 67.6% 44 mph 168 sec
GR 9.0x5.0 7.5 12.2 7230 91.2 58.8 64.5% 34 mph 148 sec
AN 8.0x5.0 7.7 9.8 8115 74.9 52.0 69.3% 38 mph 184 sec
AN 9.0x5.0 7.5 12.2 7230 91.2 58.8 64.5% 34 mph 148 sec
AN 9.0x6.5 7.4 13.6 6719 100.2 61.4 61.2% 41 mph 132 sec
AN 9.5x5.0 7.4 13.3 6807 98.7 61.0 61.8% 32 mph 135 sec
Graupner Speed 400 6.0V geared (2.60:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 8.0x6.0 7.7 9.1 7506 70.0 49.4 70.6% 43 mph 198 sec
GR 9.0x5.0 7.6 10.5 7039 79.8 54.3 68.0% 33 mph 172 sec
GR 9.0x7.0 7.5 12.2 6466 91.5 58.9 64.4% 43 mph 147 sec
GR 10.0x6.0 7.4 13.6 5998 100.6 61.4 61.0% 34 mph 132 sec
AN 9.0x5.0 7.6 10.5 7039 79.8 54.3 68.0% 33 mph 172 sec
AN 9.0x6.5 7.5 11.8 6594 88.9 58.0 65.2% 40 mph 152 sec
AN 9.5x5.0 7.5 11.6 6673 87.3 57.4 65.8% 32 mph 155 sec
Graupner Speed 400 6.0V geared (3.70:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 11.0x7.5 7.6 11.2 4768 85.0 56.5 66.5% 34 mph 160 sec
GR 11.0x8.0 7.5 11.6 4692 87.2 57.4 65.8% 36 mph 155 sec
GR 12.5x6.0 7.4 12.8 4419 95.0 60.0 63.1% 25 mph 141 sec
GR 12.5x6.5 7.4 13.2 4322 97.7 60.7 62.2% 27 mph 136 sec
AN 10.0x7.0 7.7 9.0 5288 69.6 49.1 70.6% 35 mph 200 sec
AN 10.5x6.0 7.7 9.2 5242 71.0 49.9 70.3% 30 mph 196 sec
AN 11.0x6.5 7.6 10.5 4939 80.0 54.4 68.0% 30 mph 171 sec
AN 11.5x7.0 7.5 11.8 4638 88.8 58.0 65.3% 31 mph 152 sec
AN 12.0x7.0 7.4 12.7 4430 94.7 59.9 63.3% 29 mph 142 sec
AN 12.0x8.0 7.4 13.4 4266 99.2 61.1 61.6% 32 mph 134 sec
AN 12.5x6.5 7.4 13.2 4322 97.7 60.7 62.2% 27 mph 136 sec
AN 12.5x7.5 7.4 14.0 4143 102.6 61.9 60.3% 29 mph 129 sec
AN 13.0x6.5 7.3 14.0 4127 103.0 62.0 60.1% 25 mph 128 sec
Graupner Speed 400 6.0V geared (4.00:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 11.0x7.5 7.6 10.1 4665 76.9 53.0 68.8% 33 mph 179 sec
GR 11.0x8.0 7.6 10.4 4596 79.1 54.0 68.2% 35 mph 173 sec
GR 12.0x10.0 7.4 13.4 3959 98.9 61.0 61.7% 37 mph 135 sec
GR 12.5x6.0 7.5 11.5 4350 86.9 57.3 65.9% 25 mph 156 sec
GR 12.5x6.5 7.5 12.0 4261 89.7 58.3 65.0% 26 mph 150 sec
GR 13.0x7.5 7.4 13.5 3920 100.0 61.3 61.3% 28 mph 133 sec
AN 11.0x6.5 7.7 9.4 4817 72.0 50.5 70.1% 30 mph 192 sec
AN 11.5x7.0 7.6 10.6 4549 80.6 54.7 67.8% 30 mph 170 sec
AN 12.0x7.0 7.5 11.5 4361 86.6 57.1 66.0% 29 mph 157 sec
AN 12.0x8.0 7.5 12.2 4211 91.2 58.8 64.5% 32 mph 148 sec
AN 12.5x6.5 7.5 12.0 4261 89.7 58.3 65.0% 26 mph 150 sec
AN 12.5x7.5 7.4 12.7 4100 94.6 59.9 63.3% 29 mph 142 sec
AN 13.0x6.5 7.4 12.8 4083 95.1 60.0 63.1% 25 mph 141 sec
Graupner Speed 400 6.0V geared (5.25:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 12.0x10.0 7.7 9.2 3699 70.8 49.8 70.4% 35 mph 196 sec
GR 13.0x7.5 7.7 9.3 3673 71.9 50.4 70.1% 26 mph 193 sec
GR 14.0x8.0 7.6 11.1 3378 84.3 56.2 66.7% 26 mph 162 sec
AN 12.5x10.0 7.6 10.0 3569 76.3 52.6 69.0% 34 mph 180 sec
AN 13.5x7.0 7.7 9.7 3608 74.7 51.8 69.4% 24 mph 185 sec
AN 14.0x7.0 7.6 10.5 3489 79.7 54.2 68.1% 23 mph 172 sec
AN 14.0x8.5 7.5 11.5 3326 86.4 57.1 66.0% 27 mph 157 sec
AN 15.0x9.5 7.4 13.5 2993 99.8 61.2 61.4% 27 mph 133 sec
Graupner Speed 400 6.0V geared (5.90:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 14.0x8.0 7.7 9.4 3261 72.2 50.6 70.0% 25 mph 192 sec
RB 15.0x13.0 7.4 13.3 2693 98.5 60.9 61.9% 33 mph 135 sec
AN 14.0x8.5 7.7 9.7 3218 74.3 51.6 69.5% 26 mph 186 sec
AN 15.0x9.5 7.5 11.6 2932 87.7 57.6 65.6% 26 mph 154 sec
-------------------------------------------------------------------------------
Graupner Speed 400 4.8V geared (1.85:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 7.0x3.0 7.3 15.0 12876 109.3 72.9 66.7% 36 mph 120 sec
Graupner Speed 400 4.8V geared (2.30:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 6.0x6.0 7.5 11.4 11897 86.0 62.1 72.2% 68 mph 158 sec
GR 7.0x3.0 7.6 11.0 12088 83.0 60.4 72.7% 34 mph 164 sec
Graupner Speed 400 4.8V geared (2.33:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 6.0x6.0 7.6 11.2 11840 84.5 61.2 72.5% 67 mph 161 sec
GR 7.0x3.0 7.6 10.7 12029 81.5 59.5 73.0% 34 mph 168 sec
AN 7.0x6.0 7.3 15.0 10219 109.4 73.0 66.7% 58 mph 120 sec
Graupner Speed 400 4.8V geared (2.60:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 6.0x6.0 7.7 9.3 11309 71.7 53.3 74.4% 64 mph 193 sec
GR 8.0x4.5 7.3 14.5 9361 106.1 71.7 67.6% 40 mph 124 sec
AN 7.0x6.0 7.4 12.9 9950 96.1 67.4 70.1% 56 mph 139 sec
Graupner Speed 400 4.8V geared (3.70:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 8.0x6.0 7.7 9.8 7812 75.3 55.7 73.9% 44 mph 183 sec
GR 9.0x5.0 7.5 11.5 7374 86.6 62.4 72.1% 35 mph 157 sec
GR 9.0x7.0 7.4 13.6 6823 100.2 69.3 69.1% 45 mph 132 sec
AN 9.0x5.0 7.5 11.5 7374 86.6 62.4 72.1% 35 mph 157 sec
AN 9.0x6.5 7.4 13.1 6947 97.2 67.9 69.8% 43 mph 137 sec
AN 9.5x5.0 7.4 12.8 7024 95.3 67.0 70.3% 33 mph 140 sec
Graupner Speed 400 4.8V geared (4.00:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 9.0x5.0 7.6 10.1 7153 77.4 57.0 73.6% 34 mph 178 sec
GR 9.0x7.0 7.5 12.1 6670 90.7 64.6 71.3% 44 mph 149 sec
GR 10.0x6.0 7.4 13.8 6260 101.5 69.8 68.8% 36 mph 130 sec
AN 9.0x5.0 7.6 10.1 7153 77.4 57.0 73.6% 34 mph 178 sec
AN 9.0x6.5 7.5 11.6 6780 87.7 63.0 71.9% 42 mph 154 sec
AN 9.5x5.0 7.5 11.4 6846 85.9 62.0 72.2% 32 mph 158 sec
AN 10.0x7.0 7.3 14.8 6016 107.8 72.4 67.1% 40 mph 122 sec
AN 10.5x6.0 7.3 15.0 5953 109.4 73.0 66.7% 34 mph 120 sec
Graupner Speed 400 4.8V geared (5.25:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 10.0x6.0 7.7 9.0 5664 69.3 51.7 74.6% 32 mph 200 sec
GR 11.0x7.5 7.5 12.4 5017 93.0 65.8 70.8% 36 mph 144 sec
GR 11.0x8.0 7.4 12.8 4942 95.6 67.1 70.2% 37 mph 140 sec
GR 12.5x6.0 7.3 14.3 4678 104.6 71.1 68.0% 26 mph 126 sec
GR 12.5x6.5 7.3 14.8 4582 107.9 72.4 67.1% 28 mph 122 sec
AN 10.0x7.0 7.7 9.8 5510 75.2 55.6 73.9% 36 mph 184 sec
AN 10.5x6.0 7.6 10.0 5467 76.7 56.6 73.7% 31 mph 179 sec
AN 11.0x6.5 7.5 11.6 5180 87.2 62.8 72.0% 32 mph 156 sec
AN 11.5x7.0 7.4 13.1 4890 97.4 68.0 69.8% 32 mph 137 sec
AN 12.0x7.0 7.3 14.2 4688 104.3 71.0 68.1% 31 mph 126 sec
AN 12.5x6.5 7.3 14.8 4582 107.9 72.4 67.1% 28 mph 122 sec
Graupner Speed 400 4.8V geared (5.90:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 11.0x7.5 7.6 10.4 4810 79.0 58.0 73.4% 34 mph 174 sec
GR 11.0x8.0 7.6 10.7 4749 81.5 59.5 73.0% 36 mph 168 sec
GR 12.0x10.0 7.3 14.3 4165 104.6 71.1 68.0% 39 mph 126 sec
GR 12.5x6.0 7.5 12.1 4527 90.5 64.5 71.3% 26 mph 149 sec
GR 12.5x6.5 7.4 12.6 4446 93.7 66.2 70.6% 27 mph 143 sec
GR 13.0x7.5 7.3 14.5 4130 105.9 71.6 67.7% 29 mph 124 sec
AN 11.0x6.5 7.7 9.6 4942 73.5 54.5 74.2% 30 mph 188 sec
AN 11.5x7.0 7.6 11.0 4706 83.3 60.6 72.7% 31 mph 164 sec
AN 12.0x7.0 7.5 12.0 4537 90.1 64.3 71.4% 30 mph 150 sec
AN 12.0x8.0 7.4 12.8 4400 95.5 67.1 70.2% 33 mph 140 sec
AN 12.5x6.5 7.4 12.6 4446 93.7 66.2 70.6% 27 mph 143 sec
AN 12.5x7.5 7.4 13.5 4297 99.5 69.0 69.3% 30 mph 134 sec
AN 13.0x6.5 7.4 13.6 4282 100.1 69.2 69.2% 26 mph 133 sec
AN 13.5x7.0 7.3 15.0 4042 109.2 72.9 66.8% 27 mph 120 sec
-------------------------------------------------------------------------------
There is some explanation of the terms used in Part 1. Refer to that if
necessary.
The only Gearbox I have used is the 4:1 with the 4.8V motor and the only
props I have tried on that setup are the AN 10x7 and the 9x6.5 which did
match the table closely. This was how I discovered that 15 amps is too
much current. It works but is really hard on the motor.
Disclaimer: As always I want you to treat these numbers as if they were
generated by a computer (they were) and may or may not have anything to
do with reality. I have done a lot of playing with the program that
generates these numbers and for middle of the road sport motors that are
not being pushed to the limits it does a good job. For motors and
batteries that are being pushed to the limits it does a less good job.
Remember that for Speed 400 motors and 500AR batteries anything over 10
amps is being pushed beyond the design limits. Don't expect to get long
life from this equipment when pushed this hard. The one thing that
should work reliably is comparisons. Since everything was generated in
the same way and the physics are well understood the relationships should
be reasonable.
I decided to do a part 3 which will explore interesting combinations for
sport use. In particular I will find some use for those 7.2 volt motors
that are just a waste when used on 7 cells. (Hint: they are neat motors
when used with 10 or more cells.) Stay tuned to this channel for more
information.
As always comments and discussion are welcome.
Doug Ingraham
<a href="http://rcgroups.com/shared/nospam.php?u=dpi&d=rapidnet.com">dpi(at)rapidnet.com</a></pre>
<address>
Lofty Pursuits<br>
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Rapid City, SD 57702<br>
Phone: 605 343-8760<br>
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<head>
<title>Speed 400 Motor Analysis Pt 2</title>
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<body bgcolor="#FFFFFF">
<pre>This is part 2 of my look at speed 400 motors and how they can be used. In
this part I am focusing on 7 cell operation with gear reduction. The goal
of this part is to characterize those setups usable for Limited Motor Run
(LMR). I include only data for the Graupner and Aeronaut folding props
and I limit the ranges to those appropriate for that motor. (There is
one Robbe prop that got included as well.)
First lets look at just the motors when operated on 7 cells.
Graupner Speed 400 7.2V on 7 Sanyo 500AR cells.
BEST 3.2 Amps 8.2 MTV 10516 RPM 18.3 Wo 71.1% 570 secs
MAX 9.0 Amps 7.7 MTV 6217 RPM 34.9 Wo 49.8% 199 secs
Graupner Speed 400 6.0V on 7 Sanyo 500AR cells.
BEST 5.8 Amps 8.0 MTV 14839 RPM 34.3 Wo 73.6% 307 secs
MAX 16.4 Amps 7.2 MTV 8842 RPM 63.4 Wo 54.0% 110 secs
Graupner Speed 400 4.8V on 7 Sanyo 500AR cells.
BEST 7.3 Amps 7.8 MTV 20894 RPM 43.3 Wo 75.2% 246 secs
MAX 20.2 Amps 6.9 MTV 12499 RPM 78.7 Wo 56.5% 89 secs
The 4.8 volt motor is clearly the BEST when it comes to getting the power
out most efficiently. The MAX power levels are also clearly wrong for
both the 6V and 4.8V motor. I would not suggest trying to run the 6V
motor over 12 amps unless it is timed perfectly and the brushes are fully
seated. The same goes for the 4.8 volt motor but set the amp limit to 14
amps. Even these numbers might be a little high, especially if you are
trying to make a 2 minute motor run.
On 7 cells the 7.2V motor will put out a maximum of 34.9 watts and the
other motors have no trouble putting almost twice this much so there is
no reason at all to even think about using it on 7 cells. For that reason
I didn't include the tables here because they would just add confusion.
The gear ratios explored are 1.50, 1.72, 1.85, 2.30, 2.33, 2.60, 3.7,
4.00, 5.25, and 5.90 reduction ratios that are listed in the Hobby Lobby
catalog as usable with Speed 400 motors. The 2.30 and 2.33 might be the
same but since they were listed this way I computed them this way. The
3.7 ratio is from the Robbe Planeta speed 400 planetary gearbox. I
didn't include any amp draws less than 9 for the 6V motor or greater than
14 because it is impractical. On the 4.8 volt motor the bottom range is
still 9 amps but the top is 15 amps. Again I don't believe the motor
will do this for very long because the brushes heat up very quickly and
then the brush resistance skyrockets which causes the current to drop.
The 500AR cells were selected because they will give a full power
duration of 2 minutes at currents of 15 amps which is more than is
practical with these motors.
When selecting a size you need to consider more than just using the
largest prop. Even before that you have to look at if the prop will
clear your wing. I have props I can't put on my Timothy because the nose
is too short and the prop hits the wing. The other thing to consider is
the speed of flight of the plane. You are probably not going to have
enough power to go straight up so you will have to fly the plane up on
the wing. Because of this you will need to consider the speed that the
plane has to fly in order to get a good rate of climb. The largest prop
is not going to be a very fast prop. The plane may fly ok but not climb
very fast. Tremendous thrust doesn't fly planes. Airspeed is what flies
planes. You may have to try a couple of props to get what you want. I
would err on the side of too much speed rather than not enough.
Now the data and some comments will follow.
-------------------------------------------------------------------------------
Graupner Speed 400 6.0V geared (1.50:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 6.0x6.0 7.5 11.6 11584 87.1 57.3 65.8% 66 mph 156 sec
GR 7.0x3.0 7.6 11.2 11807 84.5 56.3 66.6% 34 mph 161 sec
Graupner Speed 400 6.0V geared (1.72:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 6.0x6.0 7.7 9.5 11138 72.9 50.9 69.8% 63 mph 190 sec
GR 7.0x3.0 7.7 9.1 11317 70.4 49.6 70.4% 32 mph 197 sec
AN 7.0x6.0 7.4 12.6 9560 94.3 59.8 63.4% 54 mph 142 sec
Graupner Speed 400 6.0V geared (1.85:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 8.0x4.5 7.4 12.8 8823 95.2 60.0 63.1% 38 mph 141 sec
AN 7.0x6.0 7.5 11.5 9420 86.7 57.2 66.0% 54 mph 156 sec
AN 8.0x5.0 7.4 13.4 8564 98.8 61.0 61.8% 40 mph 135 sec
Graupner Speed 400 6.0V geared (2.30:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 8.0x4.5 7.7 9.4 8344 72.6 50.8 69.9% 36 mph 190 sec
GR 8.0x6.0 7.6 10.9 7808 82.5 55.5 67.2% 44 mph 165 sec
GR 9.0x5.0 7.5 12.4 7246 92.6 59.2 64.0% 34 mph 145 sec
AN 8.0x5.0 7.6 10.0 8150 76.2 52.6 69.0% 38 mph 181 sec
AN 9.0x5.0 7.5 12.4 7246 92.6 59.2 64.0% 34 mph 145 sec
AN 9.0x6.5 7.4 13.8 6729 101.5 61.6 60.7% 41 mph 130 sec
AN 9.5x5.0 7.4 13.5 6818 100.0 61.3 61.3% 32 mph 133 sec
Graupner Speed 400 6.0V geared (2.33:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 8.0x4.5 7.7 9.2 8306 71.3 50.1 70.2% 35 mph 194 sec
GR 8.0x6.0 7.6 10.7 7781 81.2 54.9 67.6% 44 mph 168 sec
GR 9.0x5.0 7.5 12.2 7230 91.2 58.8 64.5% 34 mph 148 sec
AN 8.0x5.0 7.7 9.8 8115 74.9 52.0 69.3% 38 mph 184 sec
AN 9.0x5.0 7.5 12.2 7230 91.2 58.8 64.5% 34 mph 148 sec
AN 9.0x6.5 7.4 13.6 6719 100.2 61.4 61.2% 41 mph 132 sec
AN 9.5x5.0 7.4 13.3 6807 98.7 61.0 61.8% 32 mph 135 sec
Graupner Speed 400 6.0V geared (2.60:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 8.0x6.0 7.7 9.1 7506 70.0 49.4 70.6% 43 mph 198 sec
GR 9.0x5.0 7.6 10.5 7039 79.8 54.3 68.0% 33 mph 172 sec
GR 9.0x7.0 7.5 12.2 6466 91.5 58.9 64.4% 43 mph 147 sec
GR 10.0x6.0 7.4 13.6 5998 100.6 61.4 61.0% 34 mph 132 sec
AN 9.0x5.0 7.6 10.5 7039 79.8 54.3 68.0% 33 mph 172 sec
AN 9.0x6.5 7.5 11.8 6594 88.9 58.0 65.2% 40 mph 152 sec
AN 9.5x5.0 7.5 11.6 6673 87.3 57.4 65.8% 32 mph 155 sec
Graupner Speed 400 6.0V geared (3.70:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 11.0x7.5 7.6 11.2 4768 85.0 56.5 66.5% 34 mph 160 sec
GR 11.0x8.0 7.5 11.6 4692 87.2 57.4 65.8% 36 mph 155 sec
GR 12.5x6.0 7.4 12.8 4419 95.0 60.0 63.1% 25 mph 141 sec
GR 12.5x6.5 7.4 13.2 4322 97.7 60.7 62.2% 27 mph 136 sec
AN 10.0x7.0 7.7 9.0 5288 69.6 49.1 70.6% 35 mph 200 sec
AN 10.5x6.0 7.7 9.2 5242 71.0 49.9 70.3% 30 mph 196 sec
AN 11.0x6.5 7.6 10.5 4939 80.0 54.4 68.0% 30 mph 171 sec
AN 11.5x7.0 7.5 11.8 4638 88.8 58.0 65.3% 31 mph 152 sec
AN 12.0x7.0 7.4 12.7 4430 94.7 59.9 63.3% 29 mph 142 sec
AN 12.0x8.0 7.4 13.4 4266 99.2 61.1 61.6% 32 mph 134 sec
AN 12.5x6.5 7.4 13.2 4322 97.7 60.7 62.2% 27 mph 136 sec
AN 12.5x7.5 7.4 14.0 4143 102.6 61.9 60.3% 29 mph 129 sec
AN 13.0x6.5 7.3 14.0 4127 103.0 62.0 60.1% 25 mph 128 sec
Graupner Speed 400 6.0V geared (4.00:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 11.0x7.5 7.6 10.1 4665 76.9 53.0 68.8% 33 mph 179 sec
GR 11.0x8.0 7.6 10.4 4596 79.1 54.0 68.2% 35 mph 173 sec
GR 12.0x10.0 7.4 13.4 3959 98.9 61.0 61.7% 37 mph 135 sec
GR 12.5x6.0 7.5 11.5 4350 86.9 57.3 65.9% 25 mph 156 sec
GR 12.5x6.5 7.5 12.0 4261 89.7 58.3 65.0% 26 mph 150 sec
GR 13.0x7.5 7.4 13.5 3920 100.0 61.3 61.3% 28 mph 133 sec
AN 11.0x6.5 7.7 9.4 4817 72.0 50.5 70.1% 30 mph 192 sec
AN 11.5x7.0 7.6 10.6 4549 80.6 54.7 67.8% 30 mph 170 sec
AN 12.0x7.0 7.5 11.5 4361 86.6 57.1 66.0% 29 mph 157 sec
AN 12.0x8.0 7.5 12.2 4211 91.2 58.8 64.5% 32 mph 148 sec
AN 12.5x6.5 7.5 12.0 4261 89.7 58.3 65.0% 26 mph 150 sec
AN 12.5x7.5 7.4 12.7 4100 94.6 59.9 63.3% 29 mph 142 sec
AN 13.0x6.5 7.4 12.8 4083 95.1 60.0 63.1% 25 mph 141 sec
Graupner Speed 400 6.0V geared (5.25:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 12.0x10.0 7.7 9.2 3699 70.8 49.8 70.4% 35 mph 196 sec
GR 13.0x7.5 7.7 9.3 3673 71.9 50.4 70.1% 26 mph 193 sec
GR 14.0x8.0 7.6 11.1 3378 84.3 56.2 66.7% 26 mph 162 sec
AN 12.5x10.0 7.6 10.0 3569 76.3 52.6 69.0% 34 mph 180 sec
AN 13.5x7.0 7.7 9.7 3608 74.7 51.8 69.4% 24 mph 185 sec
AN 14.0x7.0 7.6 10.5 3489 79.7 54.2 68.1% 23 mph 172 sec
AN 14.0x8.5 7.5 11.5 3326 86.4 57.1 66.0% 27 mph 157 sec
AN 15.0x9.5 7.4 13.5 2993 99.8 61.2 61.4% 27 mph 133 sec
Graupner Speed 400 6.0V geared (5.90:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 14.0x8.0 7.7 9.4 3261 72.2 50.6 70.0% 25 mph 192 sec
RB 15.0x13.0 7.4 13.3 2693 98.5 60.9 61.9% 33 mph 135 sec
AN 14.0x8.5 7.7 9.7 3218 74.3 51.6 69.5% 26 mph 186 sec
AN 15.0x9.5 7.5 11.6 2932 87.7 57.6 65.6% 26 mph 154 sec
-------------------------------------------------------------------------------
Graupner Speed 400 4.8V geared (1.85:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 7.0x3.0 7.3 15.0 12876 109.3 72.9 66.7% 36 mph 120 sec
Graupner Speed 400 4.8V geared (2.30:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 6.0x6.0 7.5 11.4 11897 86.0 62.1 72.2% 68 mph 158 sec
GR 7.0x3.0 7.6 11.0 12088 83.0 60.4 72.7% 34 mph 164 sec
Graupner Speed 400 4.8V geared (2.33:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 6.0x6.0 7.6 11.2 11840 84.5 61.2 72.5% 67 mph 161 sec
GR 7.0x3.0 7.6 10.7 12029 81.5 59.5 73.0% 34 mph 168 sec
AN 7.0x6.0 7.3 15.0 10219 109.4 73.0 66.7% 58 mph 120 sec
Graupner Speed 400 4.8V geared (2.60:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 6.0x6.0 7.7 9.3 11309 71.7 53.3 74.4% 64 mph 193 sec
GR 8.0x4.5 7.3 14.5 9361 106.1 71.7 67.6% 40 mph 124 sec
AN 7.0x6.0 7.4 12.9 9950 96.1 67.4 70.1% 56 mph 139 sec
Graupner Speed 400 4.8V geared (3.70:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 8.0x6.0 7.7 9.8 7812 75.3 55.7 73.9% 44 mph 183 sec
GR 9.0x5.0 7.5 11.5 7374 86.6 62.4 72.1% 35 mph 157 sec
GR 9.0x7.0 7.4 13.6 6823 100.2 69.3 69.1% 45 mph 132 sec
AN 9.0x5.0 7.5 11.5 7374 86.6 62.4 72.1% 35 mph 157 sec
AN 9.0x6.5 7.4 13.1 6947 97.2 67.9 69.8% 43 mph 137 sec
AN 9.5x5.0 7.4 12.8 7024 95.3 67.0 70.3% 33 mph 140 sec
Graupner Speed 400 4.8V geared (4.00:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 9.0x5.0 7.6 10.1 7153 77.4 57.0 73.6% 34 mph 178 sec
GR 9.0x7.0 7.5 12.1 6670 90.7 64.6 71.3% 44 mph 149 sec
GR 10.0x6.0 7.4 13.8 6260 101.5 69.8 68.8% 36 mph 130 sec
AN 9.0x5.0 7.6 10.1 7153 77.4 57.0 73.6% 34 mph 178 sec
AN 9.0x6.5 7.5 11.6 6780 87.7 63.0 71.9% 42 mph 154 sec
AN 9.5x5.0 7.5 11.4 6846 85.9 62.0 72.2% 32 mph 158 sec
AN 10.0x7.0 7.3 14.8 6016 107.8 72.4 67.1% 40 mph 122 sec
AN 10.5x6.0 7.3 15.0 5953 109.4 73.0 66.7% 34 mph 120 sec
Graupner Speed 400 4.8V geared (5.25:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 10.0x6.0 7.7 9.0 5664 69.3 51.7 74.6% 32 mph 200 sec
GR 11.0x7.5 7.5 12.4 5017 93.0 65.8 70.8% 36 mph 144 sec
GR 11.0x8.0 7.4 12.8 4942 95.6 67.1 70.2% 37 mph 140 sec
GR 12.5x6.0 7.3 14.3 4678 104.6 71.1 68.0% 26 mph 126 sec
GR 12.5x6.5 7.3 14.8 4582 107.9 72.4 67.1% 28 mph 122 sec
AN 10.0x7.0 7.7 9.8 5510 75.2 55.6 73.9% 36 mph 184 sec
AN 10.5x6.0 7.6 10.0 5467 76.7 56.6 73.7% 31 mph 179 sec
AN 11.0x6.5 7.5 11.6 5180 87.2 62.8 72.0% 32 mph 156 sec
AN 11.5x7.0 7.4 13.1 4890 97.4 68.0 69.8% 32 mph 137 sec
AN 12.0x7.0 7.3 14.2 4688 104.3 71.0 68.1% 31 mph 126 sec
AN 12.5x6.5 7.3 14.8 4582 107.9 72.4 67.1% 28 mph 122 sec
Graupner Speed 400 4.8V geared (5.90:1) on 7 Sanyo 500AR cells.
PROP Mtv Amps RPM Win Wout Effic Speed Duration
GR 11.0x7.5 7.6 10.4 4810 79.0 58.0 73.4% 34 mph 174 sec
GR 11.0x8.0 7.6 10.7 4749 81.5 59.5 73.0% 36 mph 168 sec
GR 12.0x10.0 7.3 14.3 4165 104.6 71.1 68.0% 39 mph 126 sec
GR 12.5x6.0 7.5 12.1 4527 90.5 64.5 71.3% 26 mph 149 sec
GR 12.5x6.5 7.4 12.6 4446 93.7 66.2 70.6% 27 mph 143 sec
GR 13.0x7.5 7.3 14.5 4130 105.9 71.6 67.7% 29 mph 124 sec
AN 11.0x6.5 7.7 9.6 4942 73.5 54.5 74.2% 30 mph 188 sec
AN 11.5x7.0 7.6 11.0 4706 83.3 60.6 72.7% 31 mph 164 sec
AN 12.0x7.0 7.5 12.0 4537 90.1 64.3 71.4% 30 mph 150 sec
AN 12.0x8.0 7.4 12.8 4400 95.5 67.1 70.2% 33 mph 140 sec
AN 12.5x6.5 7.4 12.6 4446 93.7 66.2 70.6% 27 mph 143 sec
AN 12.5x7.5 7.4 13.5 4297 99.5 69.0 69.3% 30 mph 134 sec
AN 13.0x6.5 7.4 13.6 4282 100.1 69.2 69.2% 26 mph 133 sec
AN 13.5x7.0 7.3 15.0 4042 109.2 72.9 66.8% 27 mph 120 sec
-------------------------------------------------------------------------------
There is some explanation of the terms used in Part 1. Refer to that if
necessary.
The only Gearbox I have used is the 4:1 with the 4.8V motor and the only
props I have tried on that setup are the AN 10x7 and the 9x6.5 which did
match the table closely. This was how I discovered that 15 amps is too
much current. It works but is really hard on the motor.
Disclaimer: As always I want you to treat these numbers as if they were
generated by a computer (they were) and may or may not have anything to
do with reality. I have done a lot of playing with the program that
generates these numbers and for middle of the road sport motors that are
not being pushed to the limits it does a good job. For motors and
batteries that are being pushed to the limits it does a less good job.
Remember that for Speed 400 motors and 500AR batteries anything over 10
amps is being pushed beyond the design limits. Don't expect to get long
life from this equipment when pushed this hard. The one thing that
should work reliably is comparisons. Since everything was generated in
the same way and the physics are well understood the relationships should
be reasonable.
I decided to do a part 3 which will explore interesting combinations for
sport use. In particular I will find some use for those 7.2 volt motors
that are just a waste when used on 7 cells. (Hint: they are neat motors
when used with 10 or more cells.) Stay tuned to this channel for more
information.
As always comments and discussion are welcome.
Doug Ingraham
<a href="http://rcgroups.com/shared/nospam.php?u=dpi&d=rapidnet.com">dpi(at)rapidnet.com</a></pre>
<address>
Lofty Pursuits<br>
2274 Aster Court<br>
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Phone: 605 343-8760<br>
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