Shark413

iTrader: (24)

While it finally let up (rain) enough for me to run the CRT.5 up and down the street for testing. I was running a half charged (3.9 volts per cell) 2s2p lipo, Mamba Max ESC/7700, 13T pinion and a 46T spur. I have a bout 50 feet of smooth road to use and I clocked it with a Bushnell speedgun. It was averaging about 35mph at the end of my 50 foot run. I made about 8 runs and the temps were: Motor 85 degrees, Battery 72 degrees and the ESC was 109 degrees. The temp outside was 68 degrees. Seems the ESC was running a little hot. I will try lower gearing (12T pinion) but it looks like it is going to start raining again.

markhat250

iTrader: (65)

Shark, I wouldn't be too concerned with temps. I run the Mamba ESC in my Losi e8ight and it takes a beating. So for my smaller crt.5 I'm not sweating at all.

I'm not sure what pinion I have actually. Cool that you clocked it. I'm more of a track guy though where top end isn't really what you're after. That seems pretty fast though!!

Shark413

iTrader: (24)

markhat250, thanks for the info. What kind of battery tray are you using? I have seen that particular model on several conversions. Looks functional and very cool.

phatmonk

This is my crt.5 with a mm and Neu 1512/2d/f with a 11.1v 3s2p battery

Shark413

iTrader: (24)

Ok, more performance info. Keep in mind these setups may not be perfect, I just wanted to get some baseline info and see how different motors performed. I will start fine tuning when it stops raining and I get my 3s2p lipo.

Battery = Maxamps 2s2p 6000mah.
ESC = Mamba Max (no fan).
Gearing: 46T steel spur and 13T hardened steel pinion.
Motor = Mamba Max 5700 and 7700.
Weight of CRT.5 with body and battery (ready to run) = 4 lbs 10 oz.
CC UBEC.
Track = pavement.

Run #1
Motor MM 7700.
Ambient temp 68 degrees .
Top speed (50 foot distance) = 35 mph.
After 8 runs (top speed then max braking): ESC 109, Motor 90, Battery 73 (degrees Fahrenheit).

Run #2
Motor MM5700.
Ambient temp 63 degrees.
Top speed (50 foot distance) = 30 mph.
After 6 runs (top speed then max braking): ESC 90, Motor 74, Battery 67 (degrees fahrenheit).
Max Watts = 378
Max (burst) Amps = 61.16

I still have a 3s2p lipo on order, and I will rerun the MM5700 test when it comes in.

markhat250

iTrader: (65)

Phatmonk, that is a sick setup in your crt. I run almost the same in my e8ight (Nue 1.5d/f which is a hair faster and 4S LiPo). I must say that would seem overkill at first glance to me after running my current e8ight setup which is crazy fast. But I know there are some who would object to saying "overkill". Anyhoo....nice conversion. Expensive motor!!

markhat250

iTrader: (65)

Smoky Racing. I havn't seem them latley (although I don't go looking anymore), but he advertises on ebay. I got mine for like $80 if I remember right. Somewhere around there. The battery mount is adjustable and custom fits whatever battery you have. My 2S 6000 MaxAmps doesn't move.

There are a lot of conversions out there, and a lot seem real nice. Mine was cheap and easy so I went with it. Couldn't be happier.

markhat250

iTrader: (65)

....that was $80 for the whole conversion, not just battery tray.

Shark413

iTrader: (24)

Ok, it's been a while since I updated this post. I have been busy working on my 1/8 brushless buggy, hooking up the mechanical brakes. But I have taken the CRT.5 out to the track and all I can say is this thing is amazing. Fast and handles better than I thought considering the extra weight. I discovered that the truggy has so much power it was wheeling when I punched it down the main straight and with neutral throttle over jumps it would have a tendency to nose up, which required braking to bring it down. I decided to make the truggy handle more neutral and provide more traction by moving the battery forward about 12mm. I removed the tray and drilled a new set of mounting holes and I extended the forward slot which allowed me to move the tray forward. I can now adjust where the CG is via the battery position. It works out great, it really hooks up now and is very controllable. Before it would hook up all right but the front wheels would lift and I would lose some directional steering. It now flys nice and level as well.

superdave2

iTrader: (3)

man the day they came out ve always wanted 1 but i wanted a brushless 1 and i guess it will be possible that thing is cool

deskwarmer

iTrader: (6)

That thing is awesome!

How much runtime are you getting out of that thing?

Shark413

iTrader: (24)

I have not run it long enough for the low voltage cutoff to kick in. I ran it on 3s2p 5000mah (11.1 volts total) batteries for about 12 mins and the cells were down to 3.6 volts (per cell) the LVC kicks in at 3.0 volts and fully charged the cells were at 4.2 volts. So it went from 4.2 to 3.6 volts in 12 mins. So I would expect around 20 mins of maximum run time.

cameronvalleycu

iTrader: (2)

hi guys i was planning to do something like this for my crt.5 can u guys guide me along. and wher can i get the motor mount. thanks

don74

iTrader: (34)

For the motor mount and other related parts go to www.rc-monster.com
http://www.rc-monster.com/proddetail...rod=rcmcrt.5mm

This link should be helpful to you.
http://www.rctech.net/forum/electric...onversion.html