what is faster

[frickenjoey]

Damn it man... stealing my thunder lol. I was thinking about doing basically the same thing. I was wanting 100 MPH since you are edging on 75mph. My plan was use the Kershaw designs direct drive center gearbox that I think will fit the 1717 with out any mods. However what I was considering doing was a step over that and put a 1/5 scale sized motor in on and run 8-10s. I think that would give you enough torque to run over a 1:1 gear ratio. My problem is having time to do this sort of stuff.

 

[bgbdwlf2500]

The 1717 is a 1580 kv motor, if you run 6s it'll be 1580kv x 25.2 volts= 39,816 rpms.

The 2200 kv on 6s is 55,440 rpms. Like I said before the 1717 will have a lot more torque than 1 2200 motor, probably about the same as 1-1/2 of the 2200 kv motors. If you wanna go fast you can either run a 2200 with too much gear or run a 1717 with too much gearing. By too much I mean too high.

I'm gonna wager a guess here and say that either motor going 100 mph in a savage will have to be geared so high that they will overheat in a matter of 1-3 minutes.....but that is only a guess. My erbe is only geared to go about 55-60 mph, but if I geared it up to 75 mph it would burn.

The more I think about this the more I think you should go with twin 2200's and twin esc's......or a lot of heat sinks and fans.


---------- Post added at 7:08 PM ---------- Previous post was at 7:07 PM ----------

I wanna know more about your 73.1 mph nitro powered savage.

The old 1717 is 1580 the new one is 1650. The 2028 is only 780 kv which is only about 29000 rpm on 8s. I don't think that will work no matter what you do

 

[Greywolf74]

Believe it or not I found a 35t spur for the vorza cd I have. Then I could grab some X0-1 34t pinions and it would be close.

The biggest fear I have with running electronics with such tall gearing is the chance of melt down. With nitro the motor mono tones to tell you it's to tall. Idk what BL would do or sound like.

With Two 2200kv motors you'll be able to push that gearing without it melting down. Still I would keep an eye on motor and esc temps but this IMO would be the best way to do what you are trying to do. The draw back is the added motor, esc and second 6S lipo will be more weight to push.

 

[DreamMachine]

Ok I have decided to stick with the twin setup as I have found a fix to my motor mount issue. Just flip them on there side and mount to the side of the TVPs. I am making a cover for the side openings so they can be mounted. Should look cool.

Build thread? I could see that but I honestly needed opinions on what motor setup and I got them. Thank you all. I can start a build thread in a other section.

25% question, ill have to get back with robin on this again but the 25% number was figured out in relation to engine rpm and gearing. For me to run 22/20 gearing with a twin motor setup requires a gain of 25%. For BL I would think it would be lower as it has double the torque my Piccos have.

 

[Greywolf74]

can't wait to see it...sounds like complete overkill which we all love!

 

[DreamMachine]

Haha both my twin builds are overkill but I want to go fast hehe

 

[2revo1maxx]

25% question, ill have to get back with robin on this again but the 25% number was figured out in relation to engine rpm and gearing. For me to run 22/20 gearing with a twin motor setup requires a gain of 25%. For BL I would think it would be lower as it has double the torque my Piccos have.

I get that with the math and all, but That's still 'theory'. Wind resistance and traction issues are going to play a huge part in it.

 

[bgbdwlf2500]

I tried a twin mm emaxx. Traction and the ability to pull the front wheels off the ground at any speed are hard to over come. You may get it to 100 but its going to take a lot of ground to do it. It was all I could do to get my flux HP to 55 because at any speed it wanted to pick the wheels up and then I was out of room.

 

[2revo1maxx]

Use the castle link and you can pull timing out of the motors as well as some other useful tuning features. I forgot then all now, it's been a year since I used mine.

 

[Riz23]

Well I can't wait to see this, and there should be a build thread on this. I agree with Bgbdwlf2500, keeping the front end on the ground will be a huge obstacle to overcome at those speeds. Good luck.

 

[DreamMachine]

Ill start a build thread today. My new design is sick

Here's a preview