BL Revo using Revo Transmission?

[BrianG]

Quick question: I was reading this thread about what "Mod1" pitch meant and it sorta answered my question. I understand it is metric, but is it 1mm? So, does that mean it will work with stock Revo spurs since those are 1.0 metric pitch gears?

BrianG-
Any updates on the Revo tranny project?

me and my friend are using a t-maxx tranny. We are still working on the motor mount. we just havent had time to make it lately.

[BrianG]

No, no updates. The tranny is now locked like I said in a previous post, but haven't tried it out in real conditions. I can guarantee it will be fine though - filling the 1/2 speed clutch wil epoxy is very effective and hard as rock.

I'll do more on this project once my currently unfinished BL Revo is finished (waiting for backordered parts from Mike).

I took a stock Revo motor mount and ground down the part that would normally be the throttle arm pivot area so now it is flat. That's as far as I got.


So, nobody has an answer to my question?

Quick question: I was reading this thread about what "Mod1" pitch meant and it sorta answered my question. I understand it is metric, but is it 1mm? So, does that mean it will work with stock Revo spurs since those are 1.0 metric pitch gears?

[ttrmike]

I'm 99.9999999999% sure that the Mod1 pinions will work with the revo spurs.

[coolhandcountry]

I remember reading about them being the same.

[MetalMan]

I've used a Revo spur gear on my 1/8 buggy, it's mod1 for sure.

[BrianG]

Cool, I kinda figured, but wanted to be sure. I hate it when you think something is gonna work and it doesn't - makes me grumpy.

Thanks.

Guys I ran into the same problem, I am trying to shrink down pics but I have them posted on my website, I will shoot pics of the individual parts this weekend. I can make the individual parts available, too

www.eaglesviewaerial.com/products.html

I just posted this to RCU the other day here is the relevant exerpts...

Since I have a small machine shop (2 cnc mills and a cnc lathe), I set out to build a BOLT ON KIT for the Revo that could be sold for less than 100 dollars in a retail setting, that would allow for a brushless drop in conversion.


To solve the gearing problem, after some messing around and searching, I found a suitable SAE pitch gear that Associated makes, and quite incidentally, it has three molded holes that were almost a perfect match to the 120 degree bolt pattern on the slipper!
So we keep the slipper (good thing), and now I had to just machine an adapter/spacer to get the gear mounted flat, (after 3 or for stripped gears I finally got one machined/sized correctly and now it is solid).

I had to lock the reverse shifter, very simple, a nicely bent piano wire and a bolt took care of it. Getting a good gear ratio (similar to the Emaxx overall G/R on a Novak system) using the stock gear box again, cheap and bolt on requires a lock up device on the second gear stage. I machined an ALU replacment hub for the second gear gearing that replaces the stock one way bearing hub that goes through it. Then you just ditch the first of the two stages of gearing, and use the lock hub so that electronic braking from the motor would work Viola! Works like a Charm!

Problem 2: Motor mounting
So I started with a hybrid motor mount of carbon and aluminum, the carbon gave too much flex and I went to an all aluminum machined two piece motor mount which allows gear ratio and mesh adjustments. (Older carbon verticle mount shown in pictures, I will shoot pics of the newer one this weekend)

Designed some simple and stiff carbon fiber trays that bolt into stock bolt holes on the chassis for the battery and ESC, and its done.

Performance:

Holy cr*p! I ran a 14 cell (cheap 3000mah NiMHs) and 4s2p TP Lipolies and it will wheelie on any surface even easing into the throttle, and is visibly faster than the nitro setup I had on my stock revo. The verticle CG remains very much the same, so the handling of the truck (other than off the line grunt which was not even close in the nitro setup) is very much the same. I went to stiffer springs in the rear to better support the battery weight and keep the ride hieght higher for my personal bashing terrain.

Price: The conversion kit is 74.99 retail, I am offering direct orders on www.eaglesviewaerial.com/products.html The only things you need to complete are BL motor, batteries of your choice, and a 14-19t pinion gear from Traxxas (from the Emaxx line). If you want to buy individual parts such as the lock up hub and gear mount for the associated gear, I can sell those individually, just call me directly.


Compared to well over 600 bucks for a complete gorilla max conversion, this offers a nice relatively cheap alternative.

Ok ok, pics, I can't post em because I took them in high quality format and don't have any of my image tools with me, check the website for detailed pics.

PLEASE NOTE THAT THE CARBON PORTION OF THE MOTOR MOUNT IN THE PICTURE IS NOW ALUMINUM....
(sorry, been out of town, need to shoot pics of the new mount piece).

I will post videos of it shortly, check my website for more details....

If you have any questions, please feel free to call or IM or email...
847-778-0874, (for IMs and email check profile).

BTW if you guys are looking for good sources for gears, I use MOD1 for all the heli engineering I do and sdp-si.com has a great source and catalog of all metric stock drive gears and pulleys etc. THey have tons of 5mm bore mod 1 gears that could replace the stock spur and bolt directly onto the input shaft of the stock revo gearbox (which is 5mm incidentally).

Mod 1 refers to the standard spacing between teeth which is largely greater than 1mm, if you look at the PDF drawings of some of the gears on sdp-si.com you can see the measurements for your self.

Hope that helps...

[BrianG]

Well, I'm almost done by second Revo conversion. I just need a motor mount (which I'm current working with b0gh0s on) and batteries. I'm hoping I can find a bulletproof alternative to Lipos, while weighing less than NiMH (Li-Ion??).

- BK 10XL (not mounted yet due to missing mount)
- Quark 125B ESC
- ~18v batteries
- Spektrum DX3 Tx/Rx
- UBEC. Also added a 1000uF 10v capacitor to the AUX channel of the Rx to help smooth out any noise from the output of the BEC and to add a little extra current oomph.
- Crimefighter tires and StableMaxx wheels
- Using the locked tranny (2nd gear, wide ratio gear set) from my mod above.

A few pictures of the semi-finished product:













This is MUCH lighter than my first version, even after adding the potential battery weight. Without actually weighing it, I'd say 9 or 10lbs tops. My goal here was to use as much stock parts as possible, especially for the drivetrain and to keep the weight low without sacrificing undercarriage clearance. I also tried to keep all noisy electronics from each other and the Rx, which is why the UBEC is mounted in an oddball place. It's hard to tell, but the chassis is painted a charcoal "hammered" finish. It's pretty strong so wear should be OK, except for the underside.

[squeeforever]

That is VERY nice. I like the all black look. I think it would look really good if you painted the rockers black as well.

Nice!!

i agree black rockers would look sweet

[BrianG]

Thanks!

Paint the rockers you say? Do you think dye will stick better? I've dyed RPM arms before and it works very well, but the rockers are made of a different type of plastic. I tried to visualize the Revo with black rockers and am wondering if it will be too much black? I also like the black look, but I also do like other colors for contrast; like the motor (blue), springs, red pushrods, etc.

imo there can never be to much black