High power RC motor and drive unit production

[recumpence]

I can have anything I make anodized any particular color. I get alot done in black, though. So, black is cheap. any other color will cost a bit.

We will have the first prototype "New Part" done tonight. Tomorrow I will try to get one complete V3 drive assembled to show.

Matt

 

[Kevinator]

so where can I buy this RC motor kit?

 

[recumpence]

so where can I buy this RC motor kit?

Sned me a PM and we can talk about your needs. I can set you up. :wink:

Matt

 

[amberwolf]

So when are you and Thud going to combine your systems into one unit that has his dog-clutch 2-speed shifter as the last reduction stage of your system?

Because I would probably save up for that, if I could adapt it to run from one of my existing motors.

 

[recumpence]

I considered asking Thud about CNC cases for his two speed. But, I do not want to step on his toes.

Matt

 

[amberwolf]

I'd say the cast ones he's making look nifty enough.

What I was really meaning was the two of you coming up with an integrated drive unit, because if there was gear shifting available it'd be more efficient, even if it was just two gears and a neutral (so no freewheels are needed but can still be left disengaged so pedalling home is possible in the event of assist failure).

If I could afford the main parts from the two of you, and had the machining tools to make the rest of it, I'd probably try to build one myself, if I end up with one of the "cosmetically imperfect" Mars motors from enoob.

That combination would probably be very useful especially for heavy-duty cargo bikes/trikes and the like. Using chains instead of belts (as you are doing for the new trike) it'd probably be useful even for e-motorcycles.

 

[damcard]

The thread shoulder can be machined off allowing the set screw hub to be inside the FW thread section. That narrows the setup by 1/2 inch. But, it hides the set screws. However, in some situations, that may be desireable.

Matt, With the thread shoulder machined off, how narrow can I get a freewheel down to, just the width of the freewheel? -David.

 

[recumpence]

Probably.

The problem with that is the set screws are hidden by the freewheel. So, if you ever need to remove it, you may have some difficulty.

Matt

 

[MitchJi]

Hi,

Matt, With the thread shoulder machined off, how narrow can I get a freewheel down to, just the width of the freewheel? -David.

Don't you need a small shoulder (1/8" or 1/4") for the FW to butt up against?

 

[neptronix]

subscribed! do want.

 

[AussieJester]

subscribed! do want.

If your referring to the reduction drives? they are available for purchase and have been for near 2 years
pm recumpence for pricing of single and two stage reduction drives, they start around ~$us 220 dollars IIRC ?
for the single stage more for the double stage reduction. The 2 speeds mentioned last few pages are not however
available to buy at this time unfortunately...unless your lucky :wink:

KiM

 

[neptronix]

subscribed! do want.

If your referring to the reduction drives? they are available for purchase and have been for near 2 years
pm recumpence for pricing of single and two stage reduction drives, they start around ~$us 220 dollars IIRC ?
for the single stage more for the double stage reduction. The 2 speeds mentioned last few pages are not however
available to buy at this time unfortunately...unless your lucky :wink:

KiM

Yes.. I am new to this board as of a few months ago, just heard about it from mwkeefer.. searched around and could not find anything, thanks for the tip; didn't know he was still making these.

 

[AussieJester]

subscribed! do want.

If your referring to the reduction drives? they are available for purchase and have been for near 2 years
pm recumpence for pricing of single and two stage reduction drives, they start around ~$us 220 dollars IIRC ?
for the single stage more for the double stage reduction. The 2 speeds mentioned last few pages are not however
available to buy at this time unfortunately...unless your lucky :wink:

KiM

Yes.. I am new to this board as of a few months ago, just heard about it from mwkeefer.. searched around and could not find anything, thanks for the tip; didn't know he was still making these.

No probs, mwkeefer is awesome fella, you know him in person do you? He has some excellent electrical/technical threads on this board
be a handy person to know anywayz...

And yes, Matt i.e Recumpence pumps these units out, no idea how many he has sold but its a lot. You are best to order ASAP
due to this being Matts 'hobby' and not full time job, there is a longer wait time on the drives, but trust me (i have one on my e-bike!) they
are worth the wait very well made and too top it off Matt is one of the most pleasurable fellas to deal with, he
doesn't mess you around and try to sell you stuff you don't need, he tells you up front what is needed his products
are high quality ONLY he doesn't sell cheap stuff so keep that in mind, his prices are very very competitive.

KiM

 

[neptronix]

Oy, mwkeefer has been super helpful, i don't know him in person though ( he's some thousands of miles away ), but we've talked on the phone for god knows how many hours.

Talked to recumpence, a setup involving these notably exceeds my budget, unfortunately. I will be getting a geared hub instead for time time being. Looked at the Cyclone kit and those look like crap.

 

[mwkeefer]

neptronix,

What is it that exceeds your budget - told ya talk to matt then to me, where there is a will there is a way - perhaps some used parts?

-Mike

 

[AussieJester]

Oy, mwkeefer has been super helpful, i don't know him in person though ( he's some thousands of miles away ), but we've talked on the phone for god knows how many hours.

Talked to recumpence, a setup involving these notably exceeds my budget, unfortunately. I will be getting a geared hub instead for time time being. Looked at the Cyclone kit and those look like crap.

Yes when all said and done the rc setup isn't the cheapest way to go, but yu have to pay the price
for high performance, as i said too, they are very high quality products its not cheap Chinese rubbish.

The cyclone kits are rubbish in stock form, the motor and controllers are good, the mounting hardware
is garbage. They can definately be improved on with little modification though, many here happily run them.

Best of luck anywayz, hopefully Mike can help you out ?

KiM

 

[Doctorbass]

first post here...

If one of these great kit can beat the 66MPH i did with an X5 .. .. or do that with less power and someone really proove that, i might try one.

at 66mph i needed around 8-10kW .. with wide bite tires 24 x 3.0"

Doc

 

[neptronix]

I've decided against it for now. Mike did have some good ideas; but i think it would be better to start my foray into electric bikes with something simpler.
Also, It rains unpredictably here for 8 months out of the year, and is quite humid.. thus, i am concerned about moisture and water affecting an RC motor.
Sealing an RC motor seems like a bad idea.. whereas hub motors disperse their heat from their casing and look to be sealed, am i correct?

It is still compelling. Maybe for a non-utilitarian ( read also: hoon-cycle ) summer bike later on.

 

[Ypedal]

any real ebike nutjob should have more than one bike anyways !!..

Come on Doc.. have at it ! It's VERY different than a hub motor, i have been commuting to work on my RC bike this week, so far i'm at like a dozen rides and nothing broke, that's a record for this bike.. !..

but yeah, i don't ride the RC bike when it rains, i use one of my hub bikes for those days.

 

[dbaker]

Go Doc If you can do such killer dropouts, an RC build will be no problem for you!

 

[Thud]

Just 66 mph?
I may have a go at this when I get the Jesters goodies done.......I may even attempt it on only 48 volts......(most likely 72) & what constitutes "oficial"? video from a chase car? GPS readout? I have no idea if the local drag strip is even running any more.
settling on the power package for the death race bike....& will have some more motors rewound soon.

whats the over/under....I want to get my bets placed

 

[recumpence]

Doc,

I have not done 66mph with an RC build. But, I have done 0 to 60 in 4 seconds. That is my yellow trike with two RC motors. That system peaks at 35kw and weighs 105 pounds with a 12S 30amp-hour lipo pack. Cool stuff.

I do not mean to sound rude, but, 66mph should not be tough to hit assuming the budget is high.

Also, 8 to 10 kw is pretty good efficiency for that high a speed. My trike requires 3400 watts for 40mph. So, that translates to somewhere around your same 8 to 10kw for 66mph. Of course, that is hard to say for sure. Maybe my setup would require more power than that to sustain 66mph. But, I do not think so.

Anyway, I know of at least one guy who ordered a drive from me a couple weeks ago with the sole purpose of running 67mph. No joke........... :wink:

Matt

 

[swbluto]

Also, 8 to 10 kw is pretty good efficiency for that high a speed. My trike requires 3400 watts for 40mph. So, that translates to somewhere around your same 8 to 10kw for 66mph. Of course, that is hard to say for sure. Maybe my setup would require more power than that to sustain 66mph. But, I do not think so.

Power is cubically related to speed, so the equation to use would be..

(66/40)^3 * 3400 = 15,273 watts.

If his system has 2/3 the effective drag area of your trike (that is, coefficient_of_drag * drag_area), then it'd approximately be 10 kW.

 

[recumpence]

Also, 8 to 10 kw is pretty good efficiency for that high a speed. My trike requires 3400 watts for 40mph. So, that translates to somewhere around your same 8 to 10kw for 66mph. Of course, that is hard to say for sure. Maybe my setup would require more power than that to sustain 66mph. But, I do not think so.

Power is cubically related to speed, so the equation to use would be..

(66/40)^3 * 3400 = 15,273 watts.

If his system has 2/3 the effective drag area of your trike (that is, coefficient_of_drag * drag_area), then it'd approximately be 10 kW.

That sounds cool.

Thing is, I can accellerate to 60mph relatively briskly at under 15kw. So, there is something amiss here. But, anyway, it is all guessing at this point.

Matt

 

[AussieJester]

I may have a go at this when I get the Jesters goodies done......

Feel free to strap the 2 speed thudster box and my HXT on steroids motor onto your race bike and blitz the 66mph mark Thudster
the motor did 10kw before with the rewind it will piss it in and ask for more

KiM

p.s oh and yes please do use 44v it will just rub more salt into the frock fan bois wounds