brushless conversion questions

[mwry13]

Also cant forget about amp draw...

Lipos are rated in terms of there C rating. The higher the C rating, the more amps that pack can produce under high stress conditions.

say for example you want a motor that will spin about 30,000 rpms which is a good starting point.

If you use a 4s pack with a 2200 kv motor you'll spin about 32,560.


if you want something comparable to 30,000 rpms on a 5s setup you'd have to run about 2000 KV motor

The RPMs in the end will be about the same but using the higher voltage of a 5s pack will yeild less amps drawn and when less amps are drawn... less heat is generated.

so in short, you can get a setup for any RPM range you want, it really depends how much you want to spend on a speed control, that decides it imo...

High voltage Speed controlls (anything over 5s ) are usually expensive and exotic... aka mgm

Lower voltage speed controlls are reasonable but you usually generate considerable heat when using them... aka mamba max

[rcsammy]

i think aslong as the price is reasonable it will be a MMM

so what sort of packs should i be looking at from here? www.maxamps.com
so far from the info everyone has given i know i need 4/5s atleast 100A continuous
personaly i would like similar performance to a nitro buggy amd runtimes long enough to make a 15 minute final(so around 20 mins to be safe) and at the moment it looks like im going with a MMM

or even better would be if i could buy just one pack(even if it is more expensive) that will last me 3 qualifiers and a final so 30 minutes(35-40 to me safe)

are either of those acheivable with the kind of setup im looking at?

[lincpimp]

Ok, given my experience, I would suggest to use a MMM, and a medusa 36/60/2000, in the V2 line. Run that on 5s lipo and you will have a cool running system with plenty of power for a buggy. I run a 36/60/1500 on 6s lipo in a hyper8 buggy and it does fine. Very nice motors for the money. I would stay away from maxamps, as there are other battery choices that will perform better and cost about the same.

So my suggestions, with links:

MMM : http://www.rc-monster.com/proddetail...steresc&cat=21

Medusa 36/60/2000, found on this page: http://www.medusaproducts.com/motors...MR036060XXXX-5

Battery : http://www.rc-monster.com/proddetail...5S_3700&cat=18

The rcmonster store can also provide you with the motor mount and battery tray, plus the pinions and other odds and ends that you need. You could buy a neu 1512 motor from there instead of the medusa, but the medusa is on special right now.

[rcsammy]

yes i do plan to get the motor mount and battery tray from rc-monster
are there any similar motors that are available through rc-monster so i could make the whole purchase from one shop as i imagine shipping to UK and customs will cost me alot
what runtimes do you get with that setup? i was expecting to need a higher mah battery