Doug Ingraham
May 01, 1996, 01:00 AM
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I finally got around to trying the motor constants provided by Matt at
Aveox for the Mega FAI-10 SP and my numbers show it to be an interesting
motor. Sure would like to give one a try. As a sport pilot I would use
the 10x7 or 10.5x6 props and save my batteries. Also, I would expect the
motor to have a long life when operated at these lower (?? more
conservative) power levels. In competition I would expect people to be
using the Aeronaut 12x7 or perhaps the 12.5x6.5 which should give a bit
better climb but a little less speed. Increasing the prop size beyond
this level will overload the motor when the batteries are fresh and just
run the duration down the rest of the time with very little increase in
performance. I computed for 8, 9, 10, 11, and 12 cells but the bulk of
people who would buy this motor would be using in only with 10 cells for
F5B competition. It is not very efficient on 8 cells and the high
no-load current makes it a poor choice for throttled back operation.
Anyone who has direct experience with this motor I would appreciate knowing
if these numbers bear any resemblence to reality. They reflect the 1/2
discharge point of a pack of 1700SCRC cells with a hot motor. Initial
operation with fresh cells and a cold motor should yield quite a bit
higher numbers.
MTV stands for Motor Terminal Voltage. BEST means Best efficiency and
MAX is the point at which you get less power out with an increase in
input current. This is the "it is stupid to exceed point". Speed is the
estimated pitch speed at that RPM and Duration is expected full throttle
duration. Win is watts in to the motor and Wout is power to the prop.
AN = Aeronaut.
APC = APC <grin>
------------------------------------------------------------------------------
Mega FAI 10SP using Aveox supplied constants. on 10 Sanyo 1700SCRC cells.
BEST 59.3 Amps 9.4 MTV 11458 RPM 400.4 Wo 71.7% 103 secs
MAX 96.8 Amps 7.8 MTV 7999 RPM 492.5 Wo 65.3% 63 secs
PROP Mtv Amps RPM Win Wout Effic Speed Duration
AN 8.0x5.0 10.4 35.5 13648 371.3 246.9 66.5% 65 mph 172 sec
AN 9.0x5.0 10.0 45.5 12725 456.2 320.6 70.3% 60 mph 134 sec
AN 9.0x6.5 9.7 52.0 12131 506.2 361.1 71.3% 75 mph 118 sec
AN 9.5x5.0 9.8 50.8 12239 497.3 354.2 71.2% 58 mph 120 sec
AN 10.0x7.0 9.2 65.5 10886 599.2 428.4 71.5% 72 mph 93 sec
AN 10.5x6.0 9.1 66.6 10778 606.6 433.1 71.4% 61 mph 92 sec
AN 11.0x6.5 8.8 74.4 10062 652.2 459.8 70.5% 62 mph 82 sec
AN 11.5x7.0 8.4 81.9 9372 691.1 478.0 69.2% 62 mph 75 sec
AN 12.0x7.0 8.2 87.0 8905 714.6 486.2 68.0% 59 mph 70 sec
AN 12.0x8.0 8.0 90.9 8541 731.5 490.2 67.0% 65 mph 67 sec
AN 12.5x6.5 8.1 89.6 8662 726.0 489.1 67.4% 53 mph 68 sec
AN 12.5x7.5 7.9 93.8 8274 743.0 491.9 66.2% 59 mph 65 sec
AN 13.0x6.5 7.9 94.2 8237 744.5 492.1 66.1% 51 mph 65 sec
APC 7.0x9.0 10.5 35.4 13661 370.0 245.8 66.4% 116 mph 173 sec
APC 7.0x10.0 10.4 37.4 13472 388.1 262.0 67.5% 128 mph 164 sec
APC 8.0x6.0 10.4 37.9 13430 392.1 265.5 67.7% 76 mph 162 sec
APC 8.0x7.0 10.2 41.1 13132 419.8 289.7 69.0% 87 mph 149 sec
APC 8.0x8.0 10.1 44.1 12858 444.4 310.8 69.9% 97 mph 139 sec
APC 8.0x9.0 10.0 46.8 12604 466.6 329.3 70.6% 107 mph 131 sec
APC 8.0x10.0 9.8 49.4 12367 486.7 345.7 71.0% 117 mph 124 sec
APC 9.0x4.0 10.3 39.2 13305 403.8 275.8 68.3% 50 mph 156 sec
APC 9.0x5.0 10.1 44.1 12856 444.7 311.0 69.9% 61 mph 139 sec
APC 9.0x6.0 9.9 48.4 12457 479.1 339.5 70.9% 71 mph 126 sec
APC 9.0x7.0 9.7 52.3 12101 508.6 363.0 71.4% 80 mph 117 sec
APC 9.0x8.0 9.6 55.8 11777 534.2 382.6 71.6% 89 mph 110 sec
APC 9.0x9.0 9.4 59.0 11484 556.5 399.0 71.7% 98 mph 104 sec
APC 9.0x10.0 9.3 61.9 11215 576.2 412.9 71.7% 106 mph 99 sec
APC 10.0x3.0 10.2 42.1 13041 428.1 296.9 69.3% 37 mph 145 sec
APC 10.0x4.0 9.9 48.8 12422 482.2 342.0 70.9% 47 mph 125 sec
APC 10.0x5.0 9.6 54.5 11896 524.9 375.6 71.6% 56 mph 112 sec
APC 10.0x6.0 9.4 59.4 11444 559.5 401.2 71.7% 65 mph 103 sec
APC 10.0x7.0 9.2 63.7 11047 588.1 421.0 71.6% 73 mph 96 sec
APC 10.0x8.0 9.1 67.6 10695 612.2 436.6 71.3% 81 mph 90 sec
APC 10.0x9.0 8.9 71.0 10379 632.6 448.9 71.0% 88 mph 86 sec
APC 10.0x10.0 8.8 74.1 10093 650.3 458.8 70.5% 96 mph 83 sec
APC 11.0x3.0 9.8 51.2 12206 500.1 356.3 71.2% 35 mph 120 sec
APC 11.0x4.0 9.4 58.8 11505 555.0 397.9 71.7% 44 mph 104 sec
APC 11.0x5.0 9.2 65.0 10930 596.3 426.4 71.5% 52 mph 94 sec
APC 11.0x6.0 8.9 70.3 10444 628.5 446.5 71.0% 59 mph 87 sec
APC 11.0x7.0 8.7 74.8 10027 654.3 460.9 70.4% 66 mph 82 sec
APC 11.0x8.0 8.6 78.8 9661 675.4 471.3 69.8% 73 mph 78 sec
APC 11.0x9.0 8.4 82.3 9338 692.9 478.7 69.1% 80 mph 74 sec
APC 11.0x10.0 8.3 85.4 9049 707.6 484.0 68.4% 86 mph 72 sec
APC 11.0x11.0 8.2 88.2 8788 720.2 487.7 67.7% 92 mph 69 sec
APC 11.0x12.0 8.0 90.8 8552 731.0 490.2 67.0% 97 mph 67 sec
APC 12.0x6.0 8.5 80.6 9496 684.4 475.3 69.4% 54 mph 76 sec
APC 12.0x7.0 8.3 85.2 9073 706.4 483.6 68.5% 60 mph 72 sec
APC 12.0x8.0 8.1 89.1 8707 724.0 488.6 67.5% 66 mph 69 sec
APC 12.0x9.0 8.0 92.6 8388 738.2 491.4 66.6% 71 mph 66 sec
APC 12.0x10.0 7.8 95.7 8105 749.9 492.4 65.7% 77 mph 64 sec
APC 13.0x6.0 8.1 90.1 8619 728.0 489.6 67.2% 49 mph 68 sec
APC 13.0x7.0 7.9 94.6 8202 745.9 492.2 66.0% 54 mph 65 sec
Doug Ingraham
<a href="http://rcgroups.com/shared/nospam.php?u=dpi&d=rapidnet.com">dpi(at)rapidnet.com</a></pre>
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<title>Mega FAI 10SP Motor Computations</title>
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<pre>
I finally got around to trying the motor constants provided by Matt at
Aveox for the Mega FAI-10 SP and my numbers show it to be an interesting
motor. Sure would like to give one a try. As a sport pilot I would use
the 10x7 or 10.5x6 props and save my batteries. Also, I would expect the
motor to have a long life when operated at these lower (?? more
conservative) power levels. In competition I would expect people to be
using the Aeronaut 12x7 or perhaps the 12.5x6.5 which should give a bit
better climb but a little less speed. Increasing the prop size beyond
this level will overload the motor when the batteries are fresh and just
run the duration down the rest of the time with very little increase in
performance. I computed for 8, 9, 10, 11, and 12 cells but the bulk of
people who would buy this motor would be using in only with 10 cells for
F5B competition. It is not very efficient on 8 cells and the high
no-load current makes it a poor choice for throttled back operation.
Anyone who has direct experience with this motor I would appreciate knowing
if these numbers bear any resemblence to reality. They reflect the 1/2
discharge point of a pack of 1700SCRC cells with a hot motor. Initial
operation with fresh cells and a cold motor should yield quite a bit
higher numbers.
MTV stands for Motor Terminal Voltage. BEST means Best efficiency and
MAX is the point at which you get less power out with an increase in
input current. This is the "it is stupid to exceed point". Speed is the
estimated pitch speed at that RPM and Duration is expected full throttle
duration. Win is watts in to the motor and Wout is power to the prop.
AN = Aeronaut.
APC = APC <grin>
------------------------------------------------------------------------------
Mega FAI 10SP using Aveox supplied constants. on 10 Sanyo 1700SCRC cells.
BEST 59.3 Amps 9.4 MTV 11458 RPM 400.4 Wo 71.7% 103 secs
MAX 96.8 Amps 7.8 MTV 7999 RPM 492.5 Wo 65.3% 63 secs
PROP Mtv Amps RPM Win Wout Effic Speed Duration
AN 8.0x5.0 10.4 35.5 13648 371.3 246.9 66.5% 65 mph 172 sec
AN 9.0x5.0 10.0 45.5 12725 456.2 320.6 70.3% 60 mph 134 sec
AN 9.0x6.5 9.7 52.0 12131 506.2 361.1 71.3% 75 mph 118 sec
AN 9.5x5.0 9.8 50.8 12239 497.3 354.2 71.2% 58 mph 120 sec
AN 10.0x7.0 9.2 65.5 10886 599.2 428.4 71.5% 72 mph 93 sec
AN 10.5x6.0 9.1 66.6 10778 606.6 433.1 71.4% 61 mph 92 sec
AN 11.0x6.5 8.8 74.4 10062 652.2 459.8 70.5% 62 mph 82 sec
AN 11.5x7.0 8.4 81.9 9372 691.1 478.0 69.2% 62 mph 75 sec
AN 12.0x7.0 8.2 87.0 8905 714.6 486.2 68.0% 59 mph 70 sec
AN 12.0x8.0 8.0 90.9 8541 731.5 490.2 67.0% 65 mph 67 sec
AN 12.5x6.5 8.1 89.6 8662 726.0 489.1 67.4% 53 mph 68 sec
AN 12.5x7.5 7.9 93.8 8274 743.0 491.9 66.2% 59 mph 65 sec
AN 13.0x6.5 7.9 94.2 8237 744.5 492.1 66.1% 51 mph 65 sec
APC 7.0x9.0 10.5 35.4 13661 370.0 245.8 66.4% 116 mph 173 sec
APC 7.0x10.0 10.4 37.4 13472 388.1 262.0 67.5% 128 mph 164 sec
APC 8.0x6.0 10.4 37.9 13430 392.1 265.5 67.7% 76 mph 162 sec
APC 8.0x7.0 10.2 41.1 13132 419.8 289.7 69.0% 87 mph 149 sec
APC 8.0x8.0 10.1 44.1 12858 444.4 310.8 69.9% 97 mph 139 sec
APC 8.0x9.0 10.0 46.8 12604 466.6 329.3 70.6% 107 mph 131 sec
APC 8.0x10.0 9.8 49.4 12367 486.7 345.7 71.0% 117 mph 124 sec
APC 9.0x4.0 10.3 39.2 13305 403.8 275.8 68.3% 50 mph 156 sec
APC 9.0x5.0 10.1 44.1 12856 444.7 311.0 69.9% 61 mph 139 sec
APC 9.0x6.0 9.9 48.4 12457 479.1 339.5 70.9% 71 mph 126 sec
APC 9.0x7.0 9.7 52.3 12101 508.6 363.0 71.4% 80 mph 117 sec
APC 9.0x8.0 9.6 55.8 11777 534.2 382.6 71.6% 89 mph 110 sec
APC 9.0x9.0 9.4 59.0 11484 556.5 399.0 71.7% 98 mph 104 sec
APC 9.0x10.0 9.3 61.9 11215 576.2 412.9 71.7% 106 mph 99 sec
APC 10.0x3.0 10.2 42.1 13041 428.1 296.9 69.3% 37 mph 145 sec
APC 10.0x4.0 9.9 48.8 12422 482.2 342.0 70.9% 47 mph 125 sec
APC 10.0x5.0 9.6 54.5 11896 524.9 375.6 71.6% 56 mph 112 sec
APC 10.0x6.0 9.4 59.4 11444 559.5 401.2 71.7% 65 mph 103 sec
APC 10.0x7.0 9.2 63.7 11047 588.1 421.0 71.6% 73 mph 96 sec
APC 10.0x8.0 9.1 67.6 10695 612.2 436.6 71.3% 81 mph 90 sec
APC 10.0x9.0 8.9 71.0 10379 632.6 448.9 71.0% 88 mph 86 sec
APC 10.0x10.0 8.8 74.1 10093 650.3 458.8 70.5% 96 mph 83 sec
APC 11.0x3.0 9.8 51.2 12206 500.1 356.3 71.2% 35 mph 120 sec
APC 11.0x4.0 9.4 58.8 11505 555.0 397.9 71.7% 44 mph 104 sec
APC 11.0x5.0 9.2 65.0 10930 596.3 426.4 71.5% 52 mph 94 sec
APC 11.0x6.0 8.9 70.3 10444 628.5 446.5 71.0% 59 mph 87 sec
APC 11.0x7.0 8.7 74.8 10027 654.3 460.9 70.4% 66 mph 82 sec
APC 11.0x8.0 8.6 78.8 9661 675.4 471.3 69.8% 73 mph 78 sec
APC 11.0x9.0 8.4 82.3 9338 692.9 478.7 69.1% 80 mph 74 sec
APC 11.0x10.0 8.3 85.4 9049 707.6 484.0 68.4% 86 mph 72 sec
APC 11.0x11.0 8.2 88.2 8788 720.2 487.7 67.7% 92 mph 69 sec
APC 11.0x12.0 8.0 90.8 8552 731.0 490.2 67.0% 97 mph 67 sec
APC 12.0x6.0 8.5 80.6 9496 684.4 475.3 69.4% 54 mph 76 sec
APC 12.0x7.0 8.3 85.2 9073 706.4 483.6 68.5% 60 mph 72 sec
APC 12.0x8.0 8.1 89.1 8707 724.0 488.6 67.5% 66 mph 69 sec
APC 12.0x9.0 8.0 92.6 8388 738.2 491.4 66.6% 71 mph 66 sec
APC 12.0x10.0 7.8 95.7 8105 749.9 492.4 65.7% 77 mph 64 sec
APC 13.0x6.0 8.1 90.1 8619 728.0 489.6 67.2% 49 mph 68 sec
APC 13.0x7.0 7.9 94.6 8202 745.9 492.2 66.0% 54 mph 65 sec
Doug Ingraham
<a href="http://rcgroups.com/shared/nospam.php?u=dpi&d=rapidnet.com">dpi(at)rapidnet.com</a></pre>
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