Ofna DM-One Brushless Conversion (DM-1)

[ssspconcepts]

Originally Posted by dangerwr

Nah, made from the standard stuff. The body is flimsy in some spots and nice and rigid in others. I bet once the wheel wells are cut the whole thing will be a bit on the flimsy side. I wonder if it will buckle from the sheer speed of the brushless?

Well that is good to know. My stock PF8 body is flimsy but it seems to hold up fine during speed runs.

Originally Posted by ssspconcepts

Well that is good to know. My stock PF8 body is flimsy but it seems to hold up fine during speed runs.

The PROTOform bodies are .040" inch lexan. I do not have my calipers here at home but I can say that the Kyosho body is not made from anything thicker than what you normally would find. They are expensive too since they are licensed models from real manufacturers.

I think my DM-1 Spec is shipping out tomorrow . Did yours come as a kit or was it 80% assembled?

I have yet to hear of anyone running a 2-speed brushless on the DM-1. When I was building my Super RS4 (EP) I heard a few people talking about using the 2-speed from the Nitro version. What I gathered was that there was little need since the electric motor has a flat torque curve and would not benefit much from the 2-speed. I do not know personally but will be interesting to hear how yours works out with the 2-speed.

If you have the room I would think a 2-speed on a larger 1/7th scale would be fun. How do these things shift? Do they use some type of centrifugal clutch mechanism that switches out at a certain RPM?

[_paralyzed_]

Originally Posted by dangerwr

I have yet to hear of anyone running a 2-speed brushless on the DM-1. When I was building my Super RS4 (EP) I heard a few people talking about using the 2-speed from the Nitro version. What I gathered was that there was little need since the electric motor has a flat torque curve and would not benefit much from the 2-speed. I do not know personally but will be interesting to hear how yours works out with the 2-speed.

If you have the room I would think a 2-speed on a larger 1/7th scale would be fun. How do these things shift? Do they use some type of centrifugal clutch mechanism that switches out at a certain RPM?

exactly, a centrifugal clutch and a one way bearing. when the second speed hits and overrides the first, the first just spins freely because of the one way

[year1camaro]

Originally Posted by dangerwr

I have yet to hear of anyone running a 2-speed brushless on the DM-1. When I was building my Super RS4 (EP) I heard a few people talking about using the 2-speed from the Nitro version. What I gathered was that there was little need since the electric motor has a flat torque curve and would not benefit much from the 2-speed. I do not know personally but will be interesting to hear how yours works out with the 2-speed.

If you have the room I would think a 2-speed on a larger 1/7th scale would be fun. How do these things shift? Do they use some type of centrifugal clutch mechanism that switches out at a certain RPM?

The dude who started this post was using a 2 speed, but he din't reply as of yet. One certain benefit would be torque curve, if you could keep it hooked up.

[jhautz]

Still running the 2 speed in mine. Works great. RCMonster even makes a 2 speed pinion adapter now so you dont have to make your own like I did back then.

RCmonster Mike built an InfernoGT last fall and used the 2 speed also.


EDIT: In post number 85 in this thread there is a short video of the car running and you can hear it shift. The pitch of the motor and gears changes when it shifts. Its like a little turbo boost kicking in.

Here we have my latest creation. I am using the solid spool with the center shaft and out drives from the 2-speed. Also, I started with a Novak conversion kit but am abandoning this idea for a RCPD top plate and motor mount with a RC-Monster battery tray.

My current plan is to use a MMM v3 and a Neu 1512 1.5D/F. I think I will gear this 3300Kv motor at 14/51 on 4S to start and see how things go. Hopefully they go fast!

Oh well, it will be several weeks for the RCPD stuff to get here so this will be it for a little while. I might anodize the parts red if I can piggy-back an order from work. Cheers!

[BL_RV0]

Originally Posted by dangerwr

Here we have my latest creation. I am using the solid spool with the center shaft and out drives from the 2-speed. Also, I started with a Novak conversion kit but am abandoning this idea for a RCPD top plate and motor mount with a RC-Monster battery tray.

My current plan is to use a MMM v3 and a Neu 1512 1.5D/F. I think I will gear this 3300Kv motor at 14/51 on 4S to start and see how things go. Hopefully they go fast!

Oh well, it will be several weeks for the RCPD stuff to get here so this will be it for a little while. I might anodize the parts red if I can piggy-back an order from work. Cheers!

Nice start man! Keep the pics coming.

[year1camaro]

Originally Posted by jhautz

Still running the 2 speed in mine. Works great. RCMonster even makes a 2 speed pinion adapter now so you dont have to make your own like I did back then.

RCmonster Mike built an InfernoGT last fall and used the 2 speed also.


EDIT: In post number 85 in this thread there is a short video of the car running and you can hear it shift. The pitch of the motor and gears changes when it shifts. Its like a little turbo boost kicking in.

I made my pinion adapter also. I probably would not have bought it even if I knew about it.....I'm into the fabrication end of this hobby. I also made the top plate and motor mount. It's cool to hear your not having problems with the 2 speed,,, that was a concern when I started this project. I watched your video, very nice...looks like it works great!

Man that thing is fast--looks very powerful on the 5S. Do you think it is capable of going 70mph with your current setup? I can not wait to finish mine up!

[ssspconcepts]

Originally Posted by dangerwr

Man that thing is fast--looks very powerful on the 5S. Do you think it is capable of going 70mph with your current setup? I can not wait to finish mine up!

The calculations say it is possible to go 70+mph...but I never could get it up to full throttle because the tires constantly break loose. Towards the end of the video there were a couple of passes where I was close to full throttle but not quite. I absolutely have to get a radar gun. I keep talking about it but I keep spending my $$$ on car parts!

By the way...I see some other folks on here are installing one-speed centers. This was a PITA to keep the DM-1 center shaft from sliding back and forth because there aren't any bearing stops milled into the shaft. Brian helped me come up with the idea to make a shim using 8.1mm inner diameter stainless steel tubing and a couple of 8.1mm innerdiameter washers. It worked like a charm. I still have some of that tubing if anybody needs it. If you order it from onlinemetals.com they charge an arm and a leg for shipping.