Direct Drive to Diff E Revo Build

[sikeston34m]

OK on to the next phase of this project. Hybrid Diffs. I can get the cases, but I have to come up with the gears.

The Hotbodies gears are compatible with the RCM Hybrid cases. In searching for parts, I found this http://www3.towerhobbies.com/cgi-bin...?&I=LXLGX2&P=7

It appears to have a 50 tooth spiral ring. Would this be compatible with the 10 tooth pinion? Here: http://www3.towerhobbies.com/cgi-bin...?&I=LXJBM3&P=7

This combination would give me 5:1 diff gear ratio which is even better IMO than the 4.3:1

With the Emaxx, from input shaft to tire the ratio's are:
1st gear: 5.62:1
2nd gear: 4.57:1

5:1 is perfect! Power it with a AXI 4120/14 at 660kv and watch it fly!

It seems there is another issue with the Hotbodies pinion. Here we have a 8mm shaft with no hole? What's the answer to this?

Maybe this? http://www3.towerhobbies.com/cgi-bin...?&I=LXFWS2&P=7

I could turn the cvd's around backwards and put the dogbone end at the diff. Are the two compatible though?

Hmmmmm.........I wonder.

[lincpimp]

Put this on the pinion and put the dog bone end into it. Cvd end can go on the motor shaft.

http://www3.towerhobbies.com/cgi-bin...?&I=LXJBE9&P=7

Mike sells the diff output shafts that can be used to put the stock silder style driveshafts on the hb diffs.

http://www.rc-monster.com/proddetail...d=RCMdiffshaft

[sikeston34m]

Ok, here's my parts list that I plan on ordering.

Towerhobbies order

Hotbodies Output Joint Cup(pinion cup)
Stock #LXJBE9 (order 2) ($3.39 each)
Note: Tower is out of stock-Ebay has them

DuraTrax Metal Set Screw Asst. 4mm (12)
Part # LXTW57 ($3.39)

THS Racing Center CVD Set Revo 3.3
Stock # LXRLN4 $37.99

2 - Hot Bodies Spiral 10 tooth pinion
Stock #LXJBM3 ($13.99 each)

2 - Hot Bodies Front/Rear Hardened Diffs (43 tooth spiral ring type)
Stock #LXLGXO ($41.99 each)

Pinion Shims
Stock #LXGPC9 ($3.89 each)

AXI 4120/14 Outrunner Motor (660 kv)
Stock #LXPPX8 ($129.90 each)

Total $279.92


RCM Order

2 - V2 Revo Hybrid Diff Cases $80 each
includes the 6mm output shaft conversions

$160 Total

As you can see, RCM's drop in Hybrid diff is alot cheaper than gathering all the parts. I wonder when he will have those back in stock? If it's soon, I will wait. If not, I'll go this way.

SuicideNeil's post is very helpful on building Hybrid diffs. Thanks Neil!!

http://www.rc-monster.com/forum/show...ht=hybrid+diff

[zeropointbug]

wow you really went all out on that purchase eh.


I can't wait to see the new results.

[zeropointbug]

http://www.greathobbies.com/producti...d_id=EFLM4060A

Have you considered the E-Flite outrunners? I hear they are very well received and have awesome power.

I don't get it, how can you be using a 650kv motor on 6s2p? This SHOULD be getting you over 50mph then?

[sikeston34m]

Originally Posted by zeropointbug

http://www.greathobbies.com/producti...d_id=EFLM4060A

Have you considered the E-Flite outrunners? I hear they are very well received and have awesome power.

I don't get it, how can you be using a 650kv motor on 6s2p? This SHOULD be getting you over 50mph then?

E Flite outrunners look VERY well. They have caught my eye for outrunner setups. Opportunity just presented a deal and I picked this New AXI 4130/20 for $100 shipping included. I thought it was the right thing at the time.

There is a ray of hope for this setup with the lower gears. First I'm going to test the 4130 further. I expect to see the cogging go away, gain some really good low speed driving. It should have explosive acceleration, but not much top end.

The 3520-7 with 650kv does get me over 50mph in the Emaxx with a 4.57:1 final reduction ratio. I once installed a 3530 (don't know how many turns), but on 6S2P A123. It was VERY impressive!! Too bad the drive dog stripped on the transmission output shaft in the very 1st run! I got about 2/3 of the charge out, and it went out. Acceleration was crazy fast and the tires ballooned so much, I never really seen it's top end. Very hard to control, if over anxious with the trigger finger. Top Speed on it had to have been in the 60's. I have another brand new 3530 waiting on the New E maxx to tame.

I decided to shrink my Lipo's in Blue. Now they closely match the Revo Chassis. They are made from 5000mah 10C cells. Each pack 2S2P will give up 100 amps Continuous and allow me 150 amp bursts. I think this 4S Lipo setup will give me all the amps I'm going to pull and more, plus some healthy runtime.

I should be working on making it lighter.

[BL_RV0]

how much does it weigh RTR?