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RC India

RC Models => Cars => Topic started by: rcforall on May 12, 2011, 04:15:07 PM

Title: Electric Conversion of TT MT A 4 using Leopard LBP 4274 - 2000 KV inrunner on 4S
Post by: rcforall on May 12, 2011, 04:15:07 PM
I am in the process of converting my TT MT A4 0.28 engine to electric  using the following set up :

1) Leopard Motors LBP 4274/2000 KV ( http://www.leopardhobby.com/product/product_veiws.asp?id=1344&functionID=01020220 )
2)Leopard 150 amp ESC   ( http://www.leopardhobby.com/product/product_veiws.asp?id=1369&functionID=01020501 )
3) battery 14.8 V 35 C 3700 mah Hard case lipo .

I used the same car with the 0.28 engine earlier , being an electric fan I decided to change it .

Here are image of the car with the engine  and now with the motor  ;) ;D

Title: Re: Electric Conversion of TT MT A 4 using Leopard LBP 4274 - 2000 KV inrunner on 4S
Post by: Divyam on May 12, 2011, 05:09:01 PM
Great conversion! But, can I point out that your LiPo is not gonna supply enough for the motor..
What conversion are you using?

Great to see a plane guy going car >:D
Title: Re: Electric Conversion of TT MT A 4 using Leopard LBP 4274 - 2000 KV inrunner on 4S
Post by: rcforall on May 12, 2011, 05:17:27 PM
Thanks

35 C X 3.7 A = 129.5 AMPS

The Motor consumption at 14.8 V is below 100 amps .

Hence I think if my calcualations are right it should last around 5-7 mins at full throttle.

Sai
Title: Re: Electric Conversion of TT MT A 4 using Leopard LBP 4274 - 2000 KV inrunner on 4S
Post by: Divyam on May 12, 2011, 05:22:12 PM
Yeah but it may lead to ballooning of the cells.. But hey, you're the expert on LiPos  :)
Title: Re: Electric Conversion of TT MT A 4 using Leopard LBP 4274 - 2000 KV inrunner on 4S
Post by: iamahuman on May 12, 2011, 05:47:04 PM
Mr.Sai,I think you should move up to 5000 mah batteries.As Divyam has said,you will be risking your lipos.Is there a chance you will be carrying leopard motors here?

PS:Happy to see another guy getting into cars.
Title: Re: Electric Conversion of TT MT A 4 using Leopard LBP 4274 - 2000 KV inrunner on 4S
Post by: rcforall on May 12, 2011, 06:31:32 PM
yes i will be carrying leopard motors  in the near future .
actually this conversion was to  try them out.
I also have an out runner to try out on one of my FPV Planes .

Well as for the batteries those were the ones I had  with me .
I am still to try and see if 4 S is ok or if I should move up to 5S or may be even 6 S as this motor is rated upto 6 S.
Tried it out now and found the conversion per say has worked out .

My only concern in moving to higher voltage is that the engine 0.28 Practical R.P.M.(R.P.M.)    3,000 ~ 35,000 rpm
Output(BHP/RPM)    2.40 BHP / 30,000 RPM  .
Hence with 4S  max voltage being 16.8 V x 2000 KV = 33600 rpm which is about close to the max practical RPM of the engine. Thus I really don't want to push the gear box beyond the max operating rpm  the engine would have provided .

On 5 S the RPM at max voltage will  we around 42000 rpm , I guess this should not affect the gear box much but just in case.

Sai

Title: Re: Electric Conversion of TT MT A 4 using Leopard LBP 4274 - 2000 KV inrunner on 4S
Post by: Tassem on May 12, 2011, 08:22:09 PM
Nice Conversion! Could you put up some more pics please?
Title: Re: Electric Conversion of TT MT A 4 using Leopard LBP 4274 - 2000 KV inrunner on 4S
Post by: iamahuman on May 12, 2011, 10:33:05 PM
5s would be too much.I would suggest you stay with 4s.
Title: Re: Electric Conversion of TT MT A 4 using Leopard LBP 4274 - 2000 KV inrunner on 4S
Post by: mail4ajo on May 12, 2011, 10:43:55 PM
How did you make the motor mount? The pics are not clear.
Title: Re: Electric Conversion of TT MT A 4 using Leopard LBP 4274 - 2000 KV inrunner on 4S
Post by: traxxrc1 on May 14, 2011, 09:52:17 AM
Even i am inquisitive for the mount.
BTW i dont think RPM of any range below 45-50 thousand can harm the truck.
You need to change the gears to metal though since this is a S28 and not a S50
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