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Other › stock blade cp motor kv. Trying to find a suitable brushless
02-10-2006 03:11 PM  12 years agoPost 1
DeaninMilwaukee

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milwaukee WI

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Title says it all. Looking for not more power, ( well, maybe a little more. ) but lighter weight and increased run times from better eff.

Thinking abot a justgofly.com 300df, know its watts handling ability is good, but dunno if KV will be close enough or not. KV's 2250. http://www.justgofly.com/tech300df.htm

Can anybody help with stock numbers, or suggest a proven brushless that works?


Thanks,
Dean in Milwaukee

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02-10-2006 04:57 PM  12 years agoPost 2
boomer6

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Cookeville ,Tn

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This might be a bit more than you are looking for..but a few people are using the Park 370 from E-Flite.Its rated at 3600 KV.......so its a bit hot.Use either an 8 or 9 totth pinion.The CP flys smooth with this motor from what I have seen.Got one the other day but havent installed it yet.Waiting for the brushed one to expire.If you want more info on it you might try contacting Chris at RCHeliWorks.net Phone # is 931-520-6017 12-6pm seven days a week.

John

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02-10-2006 08:35 PM  12 years agoPost 3
nuts4rc

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Vancouver, Wa USA

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Try this link there are some rough tests done that show about 1600KV for the stock motor http://www.runryder.com/t216550p1/?highlight=Brushless There is a ton of information in this thread.

I am using a Century 4100Kv and an 8T pinion and it is very responsive and probably a little overkill but I like it anyway.

Good luck
Russ

Thanks Russ. This is Addictive! Blade CP AEK 7CHP and a Shogun V2 now

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02-11-2006 04:31 AM  12 years agoPost 4
DeaninMilwaukee

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milwaukee WI

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Thanks guys. That information will be very helpfull. It looks like the df300 motor is too hot. Not sure yet what to pick out.

Another problem is pinion gears. I'm not sure what to do about pinions, not even sure what pitch they are, and the 2mm shaft size is harder to come by also.

Dean

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02-11-2006 05:05 AM  12 years agoPost 5
t.edwards

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Lake Geneva, Wisconsin

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3600 RPM/V (KV) with an 8 or 9 tooth pinion is pretty normal. Tom

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02-11-2006 07:55 AM  12 years agoPost 6
nuts4rc

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Vancouver, Wa USA

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The pitch I am told is 48 and the pinions are available down to 8T in most LHS. Remember that most of the brushless motors and stock motors are 2MM shafts. I just asked for an 8T pinion for a 2MM shaft and they pulled it from the car sections.

Good Luck
Russ

Thanks Russ. This is Addictive! Blade CP AEK 7CHP and a Shogun V2 now

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02-11-2006 02:06 PM  12 years agoPost 7
avator

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New Jersey

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Dean,

2250kv motor is probably not enough. I tried a 2750kv motor and it had less head speed than the stock brushed motor, both using 10 tooth pinion. Although I haven't tried it yet, I believe Boomer6 is right, that 3600kv with 8 tooth pinion is going to be the ticket.

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02-11-2006 02:18 PM  12 years agoPost 8
avator

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New Jersey

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nuts4rc,

I have a Century 4100kv motor. Do you know what your headspeed is with this motor? I tried a 2750 Fiegao BL and although the math worked out to a headspeed of 2180rpm actual speed was 1650. I remember someone in another thread wrote that you should always deduct 20% of the no load speed to get actual loaded speed. In my case he was pretty close, I think in my case it was closer to 25%. I guess it depends on the power of the motor as well. I've heard that the Century 4100kv motor isn't very powerful and might be equivalent to about a 3600kv motor in the Blade application. What do you think?

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02-11-2006 09:25 PM  12 years agoPost 9
nuts4rc

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Vancouver, Wa USA

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avator,

I do not have a tach to be able to accurately detect the rpm's but according to my calculations I am running about 2600 unloaded and about 2100 loaded. I am using an 8T pinion. When I had the 10T pinion that was stock on the motor it bogged down and got pretty warm but the 8T seemsto do the trick. The century motor has plenty of power for the Blade and I know I am getting a head speed well above the AEK and 9 tooth pinion. I set my throttle curve to have the motor spinning up pretty good before the blade pitch changes and the bird jumps off the ground quickly. I am thinking about setting my max to 90% and see how the bird ahndles there.

Hope this helps.
Russ

Thanks Russ. This is Addictive! Blade CP AEK 7CHP and a Shogun V2 now

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02-12-2006 09:03 PM  12 years agoPost 10
cornbird

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Allovertheplace

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Hey, the gear pitch is .5 module on the CP and CX. 48 diametral pitch doesn't quite fit since the conversion to .5 module is 50.8 dp. The mismatch will destroy gears...

I have ordered the set of 8 cutters for .5 module and will be making some 7 tooth pinions shortly to see how they perform on the Century 4100kv motor. 20:1 so @ 80% of 11.1v, works out to about 1800rpm full rotor speed. 1500 @ just over 9 volts.

Cornbird

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02-13-2006 04:12 AM  12 years agoPost 11
t.edwards

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Lake Geneva, Wisconsin

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Cornbird, You are correct about the pitch, but: In a situation like we have with a very small pinion against a large main gear you can get away with the pitch mismatch (0.5m vs 48 pitch) because you have so few teeth in engagement. I'm not saying it's right, but in this situation you can do it, where you can't with more equal sized gears. Happy Flying, Tom

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02-13-2006 09:49 AM  12 years agoPost 12
cornbird

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Allovertheplace

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t.edwards,
If you file (without proper machining capabilities) the 48dp pinion teeth to a centered sharp edge along their width, then you can 'get away' with the mismatch, but you are compensating for the mismatch by modifing the depth of engagement. The pinion will destroy the mating gear in no uncertain terms in a short period of time. The search for proper gearing must include the proper diametral pitch, whether modular or incremental, otherwise a shortlived reduction gear will result.

It is not recommended that this is mismatch is encouraged, as inserting a 5/16-24 bolt in a M8 tapped hole - it can be done - once. Metrics and US standard gearing and threads do not match!

Cornbird

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02-13-2006 02:11 PM  12 years agoPost 13
nuts4rc

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Vancouver, Wa USA

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All,

Thanks for the correction on the pitch of the gears on the CP. I am now going to order a pinion on line to ensure that I get the right one.

Thanks
Russ

Thanks Russ. This is Addictive! Blade CP AEK 7CHP and a Shogun V2 now

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02-13-2006 03:44 PM  12 years agoPost 14
boomer6

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Cookeville ,Tn

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If you get the 3600kv E-Flite motor...you can use the pinion from your original motor.

John

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02-14-2006 12:34 PM  12 years agoPost 15
avator

rrVeteran

New Jersey

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nuts4rc,

So then you think that the Century 4100kv motor with the 8 tooth pinion still has too much headspeed?

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02-14-2006 01:41 PM  12 years agoPost 16
t.edwards

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Lake Geneva, Wisconsin

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No, it's not too much. I've got 255mm blades @ 2600 rpm and it's finally getting stable. Happy Flying, Tom

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02-14-2006 01:46 PM  12 years agoPost 17
nuts4rc

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Vancouver, Wa USA

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No I just have to little experience to know I just was trying to offer my opinion and let people know how fast it is.

Thanks Russ. This is Addictive! Blade CP AEK 7CHP and a Shogun V2 now

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02-14-2006 02:01 PM  12 years agoPost 18
t.edwards

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Lake Geneva, Wisconsin

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2500 to 3000 rpm headspeeds seem to be pretty common on micro helis to get them to fly well. From what I've tried it seems to be true. Tom

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02-14-2006 05:21 PM  12 years agoPost 19
avator

rrVeteran

New Jersey

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Thanks,

Guess I'll give my Century 4100kv a try with an 8 tooth pinion. Think it'll work with stock transmitter & pitch curves?

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02-14-2006 06:27 PM  12 years agoPost 20
t.edwards

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Lake Geneva, Wisconsin

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Yes, but you'll want a much "flatter" throttle curve. More constant rpm and near wide open. Consider a new tx. Tom

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