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Old Apr 24, 2012, 10:33 PM
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Tamjets's Avatar
San Jose, CA
Joined Jun 2006
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Originally Posted by darmar View Post
I don't know about others but my 4mm adapters are fine, spiners are just fine. problem is out of center hole that takes the spiner screw. I dont see how washer is going to help if spinner screw hole is out of wack?
That is the bad shaft than.
The screw must center.
The washer cap on the rotor center than the spinner cap on the washer center.
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Old Apr 25, 2012, 12:01 AM
crashing build's character.
United States, AL, Dora
Joined Mar 2008
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Originally Posted by Tamjets View Post
Have you got any good luck with 4mm and 5mm shaft?
I got the quote for 100 pieces make within .0001" torence. The best I can pricel it at $14.95 each. If you think this is fair price. I'll had it made.

Let me know your opinion.
i would buy some from you. when do you think you will have some in stock?
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Old Apr 25, 2012, 12:18 AM
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San Jose, CA
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Originally Posted by onefastxp View Post
i would buy some from you. when do you think you will have some in stock?
Next week.
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Old Apr 25, 2012, 12:38 AM
there is no spoon...
Cap232ac's Avatar
Pueblo, Colorado
Joined Jul 2005
598 Posts
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Originally Posted by Tamjets View Post
Next week.
good..the shafts that came with mine are terrible!
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Old Apr 25, 2012, 08:11 AM
crashing build's character.
United States, AL, Dora
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Originally Posted by Tamjets View Post
Next week.
let us know when you get them in stock next week.
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Old Apr 25, 2012, 08:56 AM
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San Jose, CA
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Originally Posted by onefastxp View Post
let us know when you get them in stock next week.
I will.
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Old Apr 25, 2012, 11:45 AM
I make bad look so good.
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League City, Texas
Joined Sep 2006
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Quote:
Originally Posted by anlucas View Post
Already had it on the test stand so it was easy....
Battery Gens Ace 4S 2500 25c

Low Timing
14.7Volts min
39 Amps
580 Watts
1.16Kg

High Timing
14.4 Volts min
42 Amps
620 Watts
1.16Kg

No real difference in thrust, peak or settled, between the timing settings. High timing means more amps (starts out at 46 but settles around 42.). Peak Thrust for both is a touch more than 1.2Kg.
On a bigger lipo, say 3300 or 4000mah, the settled thrust is higher - around 1.25Kg.

Can't justify running this or any of these types of motors on anything other than low timing. If they run smooth on low timing then this is the best bet.

It also depends on the ESC. The HK SS (Suppo) ESCs have some different settings so one needs to experiment.

I posted tests on 4S a while ago but those were done on a different test stand and yielded 1.3Kg. I prefer these conservative numbers.
On your new test stand what are the numbers for the L2855 2300 on 5S vs the L2855 2800 on 4S?
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Old Apr 25, 2012, 11:58 AM
Formerly "Heli Copter"
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United States, CA, Watsonville
Joined Apr 2009
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Mega Motor 16/40 1.5RC

Here is a quick comparison of the Change Sun 10-blade rotor in a TamJets 70 shroud with a Mega Motor vs. a E-flite V32, both on 6S nanotech 4500 35C.

Mega Snake (3 min 51 sec)


The pass at the 1 minute mark dopplered at 130.6 mph for an average speed of 127.95 mph. Castlelink file below.
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Last edited by Jetsom; Apr 25, 2012 at 12:02 PM. Reason: addition
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Old Apr 25, 2012, 12:06 PM
Formerly "Heli Copter"
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United States, CA, Watsonville
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Bl32

Here is the BL32 video and Castlelink file.

Secret Setup (4 min 45 sec)
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Old Apr 25, 2012, 12:16 PM
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Greece, Attica, Athens
Joined May 2011
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Quote:
Originally Posted by SteveC68 View Post
On your new test stand what are the numbers for the L2855 2300 on 5S vs the L2855 2800 on 4S?
Steve,

I did the 5S test about a month ago....

http://www.rcgroups.com/forums/showp...postcount=2860

I haven't documented the 2800kv tests on this stand. It's currently nested in my DH Vampire.
The L2855-2800kv/CS10 combo pulls around 60amps settled on 4S and generates around 1.35Kg thrust settled. This is on low timing.
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Old Apr 25, 2012, 01:38 PM
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San Jose, CA
Joined Jun 2006
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Thanks for sharing both data.

Look like the E-flite BL32 2150KV motor is better choice.
Lower amps and watts.
Ofcourse the mega are faster. But for 31A higher is cut the flight time so short.
Sean Habu is fast enought with E-flite BL32 motor set up average 120 mph.
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Old Apr 25, 2012, 07:01 PM
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Australia, VIC, Melbourne
Joined Nov 2006
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Yes, that L2855-2800kv 4S data is almost a dead match to my tests.
It doesn't compare to the 2300kv on 5S. So for one part, if you can fit the battery, and bear the weight increase, it will be repaid in the thrust gain IF the plane can extract a good level of the thrust from the fan when it is installed. You will likely find that the 5S 2300kv 1.8Kg bench thrust will flounder down by a LOT when in the plane. So then it might very well not even beat the 4S setup that was way lower thrust on the bench.

My Meteor, which has the CS10 with L2855-2300 on 5S (but it only benched at 1.45Kg area, and which might be amiss) drops to 1.25Kg in-plane (static), but the Meteor (Habu clone) has a good ducting system (inlet and exhaust) so its losses are smallish. A typical plane made for 4S will likely have far more restriction, and thus more thrust loss of the 'over-power' 5S system you try to use in it (or even a high power 4S). Thus as mentioned above, it might very well 'eat' most of the extra thrust/power you put into it anyway - giving a poor return for the extra cost and weight.
You can only find this out in advance if someone else has actually tried it... otherwise you will just have to go through the tests yourself.
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Old Apr 25, 2012, 08:26 PM
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GryphonRCU's Avatar
United States, CA, SF
Joined Mar 2008
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Quote:
Originally Posted by Tamjets View Post
Thanks for sharing both data.

Look like the E-flite BL32 2150KV motor is better choice.
Lower amps and watts.
Ofcourse the mega are faster. But for 31A higher is cut the flight time so short.
Sean Habu is fast enought with E-flite BL32 motor set up average 120 mph.

Thanks for sharing your personal thoughts on the Mega setup...(Tam and employees).

BL 32 is definetly a choice for people not needing additional speed.
It is incapable of efficiently reaching the same max speeds and surviving as a Mega 16/40.

Now Mega can reach the same performance level as in Heli Copter's video or more with fewer AMPs using lower KV and more cells... You are correct again.

Anytime people want to fly faster, they will have to run more Watts.
Given a fixed battery size/weight the run time will be shorter.
***Good thing the 6S in the Mega video above was larger than stock and had good run time.


Glad Sean is happy with his speeds, I take it that you will be pleased to see people fly at slower and faster speeds.


Glad to read posts about that Mega setup from the "owner" of the plane: Heli Copter.
Hope to read more about his plane from him versus commentary from other people trying to increase their own sales.

Let's see what pattern continues if any.

Nice Job Heli Copter.
You met your original objectives.
***Since you are now interested in trying even more power from Mega 16/40 I will show you how.


Gryphon
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Old Apr 25, 2012, 09:05 PM
Formerly "Heli Copter"
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United States, CA, Watsonville
Joined Apr 2009
425 Posts
Quote:
Originally Posted by GryphonRCU View Post
Thanks for sharing your personal thoughts on the Mega setup...(Tam and employees).

BL 32 is definetly a choice for people not needing additional speed.
It is incapable of efficiently reaching the same max speeds and surviving as a Mega 16/40.

Now Mega can reach the same performance level as in Heli Copter's video or more with fewer AMPs using lower KV and more cells... You are correct again.

Anytime people want to fly faster, they will have to run more Watts.
Given a fixed battery size/weight the run time will be shorter.
***Good thing the 6S in the Mega video above was larger than stock and had good run time.


Glad Sean is happy with his speeds, I take it that you will be pleased to see people fly at slower and faster speeds.


Glad to read posts about that Mega setup from the "owner" of the plane: Heli Copter.
Hope to read more about his plane from him versus commentary from other people trying to increase their own sales.

Let's see what pattern continues if any.

Nice Job Heli Copter.
You met your original objectives.
***Since you are now interested in trying even more power from Mega 16/40 I will show you how.


Gryphon
Thanks Gryph,

I'm getting out my foam grinder 'cause it sounds like you are talking about 7S!
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Old Apr 25, 2012, 09:16 PM
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United States, CA, SF
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Quote:
Originally Posted by Heli Copter View Post
Thanks Gryph,

I'm getting out my foam grinder 'cause it sounds like you are talking about 7S!
I'm thinking lower KV, 11S-12S , smaller cells. ...I promise you a bunch more RPMs and some more speed.

With higher KV, each cell is a big jump..............howerer if you want to risk your current motor on 7S to its insane limits/too far; Using that data the other motor we spoke of before can be tuned to deliver even more power and live.
It is your choice, and I will support you either way.

16/40/2C can outperform 16/40/1.5RC
I can show you which 16/X to go with.

Gryphon
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Last edited by GryphonRCU; Apr 25, 2012 at 09:24 PM.
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