T maxx hv conversion

[lincpimp]

Ok, here is my latest project (yeah, like I need another project!)

Have a ton of maxx parts and brushless stuff and want to go Hv with it. So here is my planned setup. Std t maxx chassis with a revo tranny, proline bellcrank steering, 4wd thru some hybrid bulks (maybe), and an interesting powerplant!

I have a feigao 20xl (835kv) and a pair of 2200mah 20c 5s lipos. So figuring 10s lipo thru the motor should get it spinning around 30k rpm. Gear it about 20/40 and leave the 2 speed intact in the revo tranny. Forward only so no reverse servo. Keep the mech brakes too. Thinking of using the great planes hv esc that recently came out with a pixstix adapter.

ESC: http://www3.towerhobbies.com/cgi-bin...?&I=LXRDH3&P=7

So, what do you guys think, worth a damn? Keep in mind I have everything except the esc and a few small parts (not much missing).

[tashpop]

got my attention. sounds like a cheap build to complete too so bonas.

[suicideneil]

If you've got the parts laying around, then why not build it- use it as a test mule for all kinda of crazy setups.

[lincpimp]

My only issues will be battery mounts, but I think I have that figured out. I am thinking that a modded RCM revo mount will be used as the motor mount. Last time I did a brushless t maxx my mount was the part I did not like, so the revo mount should be better. I was going to use the 20xl in a xfactor based crawler, but I want to try some high voltage setups and I think this will be badass! I also have enought 20c 2100mah cells to do a 12s 2100mah batttery config, but that may be a bit much!

[sleebus.jones]

Hm. How about using this for an ESC?

https://www.unitedhobbies.com/UNITED...idProduct=4691

Not that you'd need 100A at 12S, but the price is right. :) Should be a pretty cool build. A 20XL with that kind of voltage should just give you oodles of runtime.

Man, oodles is the coolest word ever, except for maybe weasel. :)

Sleeb

[lincpimp]

Originally Posted by sleebus.jones

Hm. How about using this for an ESC?

https://www.unitedhobbies.com/UNITED...idProduct=4691

Not that you'd need 100A at 12S, but the price is right. :) Should be a pretty cool build. A 20XL with that kind of voltage should just give you oodles of runtime.

Yeah, I was thinking of that one at first but then found the great planes one and figured that I would give it a try and let you guys know how it worked, just in case anyone else wanted one!

Originally Posted by sleebus.jones

Man, oodles is the coolest word ever, except for maybe weasel. :)
Sleeb

That is hilarious

Weasel is a cool word, wonder how they came up with that word? 2 guys sitting in the woods, one says "hey what is that thing over there?" other guy "dunno looks like a rabbit?" , "thats not a rabbit!" "well, watch wanna call it then?" "How bout a weasel?" "Ok, dude that is a cool word, weasel!" "I know!" We can only guess that is how it came about.

[sikeston34m]

Originally Posted by lincpimp

Yeah, I was thinking of that one at first but then found the great planes one and figured that I would give it a try and let you guys know how it worked, just in case anyone else wanted one!




That is hilarious

Weasel is a cool word, wonder how they came up with that word? 2 guys sitting in the woods, one says "hey what is that thing over there?" other guy "dunno looks like a rabbit?" , "thats not a rabbit!" "well, watch wanna call it then?" "How bout a weasel?" "Ok, dude that is a cool word, weasel!" "I know!" We can only guess that is how it came about.

What I wanna know is, Who was the first guy that seen a Calf getting Milk from the Mamma cow, and thought there MIGHT be something good to drink in there?

[lincpimp]

Originally Posted by sikeston34m

What I wanna know is, Who was the first guy that seen a Calf getting Milk from the Mamma cow, and thought there MIGHT be something good to drink in there?

Good point, I think his brother thought that eating fish eggs (caviar) was a good idea. Probably something wrong with the whole family!

[lincpimp]

Ok got some work done on the chassis today. I have decided to use my spare bombproof torpedo chassis braces. I mated them to a stock tmaxx chassis and made an extension for the rear. I used 6061 al plate and al u channel to make the extension/brace. It added 5.5cm to the length of the stock chassis. Transmission is a tmaxx 3.3 case with revo internals (thanks arct1k). I installed a wide ratio 2nd gear. Steering is a proline setup. Skids, bulks, and towers are all stock, had them laying around! Heres the pics:

[suicideneil]

Thats an idea that hasne been discussed much, but is worth looking at. feigao sell strong planetary reduction gearboxes that are a direct fit for any normal sized motor with a 25mm mounting pattern.

[lincpimp]

Spent a few hours on the tmaxx today and basically have a roller now

Anyway, I have flipped the chassis over for better battery tray mounting, extended the chassis cutouts to make room for the revo center driveshafts. I used the really short revo 2.5 center shaft as the front driveshaft, and used a stock length wheel driveshaft for the rear center. I also modded the aftershock diffs to accept the rcm diff output adapters (drop in fit with the diffs) and the 8mm rcm driveshaft yoke for the diff pinion (required a little grinding for a perfect fit). Then assembled the arms and revo bearing carriers, using revo driveshafts. I also installed a set of blue ofna 17mm hubs.

Next up is to fabricate a set of battery trays (easy) and a motor mount platform (not so easy). I would like to use the rcm revo motor mount, and I have one and have been very happy with its performance and design so far. The only issue is that it may contact the rear center driveshaft, so I need to raise the base of the motor mount, while still retaining a solid mount. I am thinking some sort of bridge actoss the rear chassis cutout, and attaching the revo mount to that. I do not want to add too much weight, so I may make a new lower portion of the revo mount to bridge tha gap.

Heres some pics:





Now for a QUESTION: Does anyone know what linkages to use for steering and rear toe rods, as the tmaxx ones I have are too short. Do I need to buy revo links?

[sikeston34m]

Linc, This is going to be an Awesome Conversion!

Is that the modded 1/8th diffs I see peeking out from in between those bulkheads?

[lincpimp]

Originally Posted by squeeforever

You need T/E-Maxx 3.3 ones. Revo won't work I don't think.

Yep, did some research and found the part#s that i need. Should be 5141 5143 5347 and 5355. That covers the two different length rods and the pivot ball/spacers.

Originally Posted by sikeston34m

Linc, This is going to be an Awesome Conversion!

Is that the modded 1/8th diffs I see peeking out from in between those bulkheads?

Thanks Sike, just need to make up a motor mount and battery trays and it should be ready to roll. I will try to get the steering and brake servos hooked up tomorrow, and maybe the bumpers, etc. I just ordered all 8 shocks, 28 bucks inc s/h from fleabay! And I should have the esc and prog card next wed. This project may come together sooner than I planned!

And yes, those are the aftershock diffs hanging out in the stock maxx bulks. This drivetrain looks very solid! Hope it can hold up to the 20xl on 10s!

[squeeforever]

You need T/E-Maxx 3.3 ones. Revo won't work I don't think.

[squeeforever]

What kind of shocks did you get?