Brushless Losi 8ight

[Sylvester]

Good work star!

[Serum]

I don't see cogging as any issue for our RC.. cogging is bad for crawlers maybe, but i personally don't see the use of a clutch in a BL truck. (not saying i don't admire your work StarScream!)

[sleebus.jones]

Originally Posted by starscream

Any vehicle using a center diff should utilize brake bias, IMO, so it makes even more sense to use mechanical brakes in a 1/8th buggy.

You are absolutely correct. That is a bit of a concern of mine with my conversion, but I'm trying to not let it bother me that much, haha. I don't race, and this is just going to be a fun toy. :)

Sleeb

[glassdoctor]

True in theory, and I was concerned a little about racing without the brake bias. But after racing a few times I don't think it's a big deal at all.

When you grab a lot of brakes you can lock em up and cause the car to push bad for a second, but there arn't many times you need to do that. In fact, this is usually due to coming into the corner too hot and having the brakes too strong. You really only need a quick stab of brake to settle the car so it will dive into the corner.

Bottom line is I've never felt that the brakes were a problem on the track... my car handles and corners awesome. It would be cool to be able to try it with mech brakes though just to feel the difference.

[starscream]

Well, the maiden voyage was a success. I still have a few issue to work out but the 8ight ran really well and I am very happy with its performance so far.

The clutch needs a little adjusting and it doesn't seem to engage as soon as I'd like. I'm not sure if running 4 shoes instead of 2 will help but I may give it a try.

I also lost my brakes because my servo seems to have died.

I was tempted to stay and race but these little issues kept me from participating.

The 8ight is an awesome buggy, kudos to Losi :017:

[starscream]

Originally Posted by Serum

I don't see cogging as any issue for our RC.. cogging is bad for crawlers maybe, but i personally don't see the use of a clutch in a BL truck. (not saying i don't admire your work StarScream!)

My system doesn't suffer from cogging as its sensored.
Maybe its just my setup but if I use a direct drive setup (without a one way or in this case a nitro clutch) The motor slows the wheels down on jumps causing me to always give the motor throttle during jumps or the vehicle will nose dive. A free spinning pinion correcxts this issue for me.

Glass, I actually ran with no brakes today, as my brake servo seems to have died. I really only need rear brakes for racing but even with just rear brakes I still need a free spining pinon.

If I could get a oneway setup for just the front end, then I could use the motor for rear braking only.

This issue is probably more apparent for me since I'm using an airplane ESC but I do remember experiencing this with my Quark as well, it just wasn't as bad.

Does anyone else notice this effect from the motor slowing down during jumps or is it just me?

[squeeforever]

Originally Posted by starscream

My system doesn't suffer from cogging as its sensorless.

Do you mean sensored?

[starscream]

Good catch squee, indeed it is sensored.

[sleebus.jones]

Originally Posted by starscream

This issue is probably more apparent for me since I'm using an airplane ESC but I do remember experiencing this with my Quark as well, it just wasn't as bad.

Does anyone else notice this effect from the motor slowing down during jumps or is it just me?

I bet that's your problem. It's probably braking when you are off the power. I run a mamba max 5700 in a rc10 t4 and i don't have nosedive problems, because it freewheels nice when i get off the throttle. Most of the time I have a nose up problem because I don't get off the throttle.

Sleeb

[Dafni]

That was quick, Starscream, I remember when you picked it up.
Good to hear it's working out for you!
I have a hard time figuring out what is what on your buggy, though... somehow the wires obscure the nice view :) But if it works, it works!

I agree on the brake bias thing, and my next conversion will have mechanical brakes too. But, I found the centerdiff/motorbrake does just what I want too.

Thank you for sharing the pics and all.
DAF

[Serum]

The motor slows the wheels down on jumps causing me to always give the motor throttle during jumps or the vehicle will nose dive

Yeah, that's one thing, but its just a matter of giving a bit of throttle. With electric you can correct the diving/back flipping easier and quicker. at a certain point the centrifugal clutch will stay engaged. i think this point makes it harder to have air-control.

The guys at BPP made their (initial) truck using a mechanical brake too, but after getting it up for testing they ditched the whole mechanical brake thing.

[BP-Revo]

Damn that thing looks awesome. As for the clutch, off the line, I wouldn't suggest dropping full throttle. The motor will hit relatively high RPM's well before the clutch will full engage and it will glaze/wear the clutch shoes quite quickly.

[jollyjumper]

Originally Posted by Serum

I don't see cogging as any issue for our RC...

havent some people blew esc's because of it?

[Serum]

what makes you think that?

[starscream]

Thanks DAF,
The pics were a bit darker than I'd like so it's a little hard to see.
I worked on mounting the batts on both sides of the buggy but the buggy is so compact that its a bit too hard to accomodate that setup without major modifications.

I'm running the RTR setup so its only got two aluminum clutch shoes. I have to hammer the throttle to get this thing going but its quite a ride. I ordered a new flywheel and set of aluminum clutch shoes so I can run 4 shoes instead of two. 4 shoes should help engage faster and lessen the wear.

I also removed the front brakes and installed a micro server for the rear brakes to cut down on the weight.

I also picked up the sweet looking JConcepts HD body and wing :017: