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Scorpion Power Scorpion Power
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BEAM
Other › What's to hot for an ESC
07-11-2008 11:50 PM  9 years agoPost 21
jamesppp

rrApprentice

carrollton georgia​usa

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Yea, a 1700kv motor would require a 17t pinion to get a 2500rpm head speed on 4S.
The lowest kv motor used as a gearing example in the Beam manual is 2500kv and the recommended pinion for that is 16t-17t.

The only pinion suggested for a 3500kv is an 11t. A lot of guys are running 13t with the 3595kv Scorpion 8's. Im just running an 11t with mine. I like the long flight time and I cant do anything close to 3D anyway

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07-12-2008 05:47 AM  9 years agoPost 22
pixturethis

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Wichita, KS USa

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It was someone running 4s lipo's. But I may be wrong.
I did some flying today, I like the gov. & have 100-95-85-95-100 I've had to backoff some pitch on the top & bottom but it does fly nice. I might have to try a better motor sometime in the future, but for now the 430L is fine. Temps did go down to 112 on the esc & 100 on the motor.
thanks for all the help.

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07-12-2008 04:47 PM  9 years agoPost 23
Terrabit

rrElite Veteran

Seattle, WA - USA

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I stand corrected!

Someone is running a 1700kv motor in a Beam E4 - ON 6 CELLS!!!!

[url=http://runryder.com/helicopter/t444993p1/?p=3592628#RR]

This is crazy, wild, unimaginable, ridiculous, WOW! I want to see it in action. I can't imagine how this thing must fly. I can't imagine that little heli handling all that power.

So, I guess a 1700kv motor in a Beam is not out of the question.

Wow!

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07-13-2008 12:06 AM  9 years agoPost 24
jamesppp

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carrollton georgia​usa

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Head speed is less than 2500 with 11t pinion and 90% effieciency. It is less than half the KV of a Scorpion 2221-8 so twice the voltage still gives slightly less headspeed with the same gearing.

Now something in the 2200-2300kv range would spin it up.

RC heli did a high voltage setup in , I believe a 450 size heli to test castles newest HV ESC. I think a 30a, maybe a 35a ESC. They said it has some benefits like very low amp draw of couse. I need to re read the article

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07-13-2008 12:15 AM  9 years agoPost 25
eggmcmuffinplz

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They tested the phoenix 30HV last month. They used an 8s on a 450

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07-13-2008 12:28 AM  9 years agoPost 26
jamesppp

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carrollton georgia​usa

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Yep, i just got the mag out of the john...

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07-13-2008 01:37 AM  9 years agoPost 27
Ozydego

rrKey Veteran

Westerville, Ohio

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Like was stated earleir, Kv is easily translated as rpm's per volt. A 3550Kv motor running on a 3 cell lipo (11.1v) has a theoretical rpm of 39405.

Now, this is then output on say a 13 tooth pinion with the main gear being 150 teeth.

Using the headspeed calculator on readyheli with a theoretical effeciency of 90%, the headspeed is 3074. With a realistic effeciency of 80% it is 2732, so the headspeed is somewhere between 2700 and 3000.

Here is the link to the headspeed calculator http://www.readyheli.com/category_s/81.htm

efficiency is a funny thing, tight gear meshes, tight belts and bad bearings lower the effeciency, and less effeciency is seen by more heat. they go had in hand. free up the gear train, raise the effeciency, raise the headspeed.

As far as motor temps, anything under 140 degrees farenheit is fine for the magnets, above that has the possibility of demagnetizing them.

But Honey, I can't live with just stock.....

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07-14-2008 03:46 PM  9 years agoPost 28
pixturethis

rrNovice

Wichita, KS USa

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Thank you very much Ozy, that was the kind of info I was looking for.
So far I do like the way the Beam flys with this new setup. The gov didn't shorten my times but maybe 20 to 30 seconds on the same battery. I went to a fly in this past weekend & had some trex 450 & trex 600 flyers fly my beam. They where so impressed with the way the beam flew. They were shocked at how it didn't have any interactions & how fast & stable it was. So hopefully there will be 2 more beam flyers out here.

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07-14-2008 05:06 PM  9 years agoPost 29
mstuck

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Valencia,​California-USA

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Ya know, that same thing happened to me about 3 weeks ago
I took my beam to my local flying field for the first time and everyone loved it and this weekend two people had one!!

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