Another DH Project

[Jamzz]

Sounds bad ass going through the gears.

[AussieJester]

Sounds bad ass going through the gears.

Reminded me of an F1 car from 1-3rd gear freakin sweet ride mate
love to see some trail riding vids when you get the chance....congrats on a stella build!
Hands down the best RC MTB conversion on the forum...IMO

KiM

[motomoto]

I do have some dirt footage. It was done at 1080p with a GoPro camera, but I haven't figured
out how to get it on YouTube at 1080p.

http://youtu.be/lIWwZOr-DDQ

[Chambers]

WOW your bike looks and SOUNDS awesome .

Beautiful machining.

[AussieJester]

I do have some dirt footage. It was done at 1080p with a GoPro camera, but I haven't figured
out how to get it on YouTube at 1080p.

http://youtu.be/lIWwZOr-DDQ

Hell yeah!!! she flogs off road too!!! How could anyone not like the sound!!

Superb work MotomotoMaN...

KiM

[Kepler]

Absolutely first class. Looks and sounds fantastic. With complete respect, if only it was reliable. I am sure you will find a way to achieve this. Perhaps one of the Plattenberg motors will be up to the task. How would this be with one of the new electric change derailleurs.

[rodgah]

great to see some footage of it.

Does limiting the amps of the CA effectively control the motor temps? or does slow high load (high phase currents) riding still get the better of the motor?

such a sweet design.

Rodger

[dbaker]

Awesome bike

[Byte]

Awesome! Very nice!

But it sounds like you keep on the throttle while shifting gears. Is that correct? And isn't that bad for the ESC as it needs more current? I thought when shifting through gears you should always stop giving throttle for a few seconds...

[Whiplash]

Hard to argue with that vid! Killer! Finally somebody does a proper dirt ride! Love the bike! Getting better all the time! I wish I had your resources!!

[motomoto]

Absolutely first class. Looks and sounds fantastic. With complete respect, if only it was reliable. I am sure you will find a way to achieve this. Perhaps one of the Plattenberg motors will be up to the task. How would this be with one of the new electric change derailleurs.

I don't have reliability issues since I cured the Astro Flight heat problem. I designed some new cans that have 60 count 1/8 inch diameter holes running through
the perimeter of the housing. I found the most powerful fan I could find (11.5 watts) and stuck it on the end of the motor. I have a temperature probe stuck in
the motor that turns the fan on at 100 degrees F. When I did my 11.5 mile dirt loop at full speed using 80 watt hours per mile the fan turned on about 3 times
for about 5 minutes at a time.

But it sounds like you keep on the throttle while shifting gears. Is that correct? And isn't that bad for the ESC as it needs more current? I thought when shifting through gears you should always stop giving throttle for a few seconds...

I have no idea if it is bad for the ESC. It probably spikes the current momentarily. I don't usually shift it under full throttle, but I did for the video.

Does limiting the amps of the CA effectively control the motor temps? or does slow high load (high phase currents) riding still get the better of the motor?

I don't know what high phase currents are. I don't necessarily like limiting the amps as that also limits the fun in my book. My CA setup has the small shunt that is limited to 99 amps,
so until I put in the bigger shunt, that is all I have. The can and fan effectively control the motor temp.

[AussieJester]

Oh now your just showing off HAHAHA That is SiCK buddy Absolutely SiCK!!!

IMG_1390.jpg (28.74 KiB) Viewed 450 times

I hazard to guess the price this would cost at a machine shop to get done
Oh to have the machinery and the nous to do this stuff...

KiM

[dbaker]

Great to hear your 3220 cooling mod was so effective

[rodgah]

I don't know what high phase currents are. I don't necessarily like limiting the amps as that also limits the fun in my book. My CA setup has the small shunt that is limited to 99 amps,
so until I put in the bigger shunt, that is all I have. The can and fan effectively control the motor temp.

I'm with you on limiting the fun . I assume you have a CA-RC and thats how you are limiting your current. If so didnt you get the supplied 2 little shunts? My understanding of going over a shunts current range means it becomes hot and starts to act like a fuse?

I love the Can + fan. Looks the part.....i can just imagine a bike rolling to a stop with the quiet roar comeing from the fan. I get a kick out of seeing automated systems like cooling and motion control working.....

Time to uprade to a 3220, piss the gears off and start pulling power monos

[Whiplash]

I thought I saw a fan on the motor! Niiice!

[kfong]

Wow, what process did you use to drill all those holes. The fact that it ran the length of the can was really impressive machining.

[motomoto]

I'm with you on limiting the fun . I assume you have a CA-RC and thats how you are limiting your current. If so didnt you get the supplied 2 little shunts? My understanding of going over a shunts current range means it becomes hot and starts to act like a fuse?

I got the shunts but I can't find them. I used the molded shunt. I need to redo the wires and such.

I love the idea of the shunt being a fuse, that would be awesome. Have them easily replaceable. I just wonder when they are in a partial state of meltdown, how that will effect
the voltage reading that supplies the CA. But who cares, the important thing is that your expensive electrics are not frying.

Wow, what process did the use to drill all those holes. The fact that it ran the length of the can was really impressive machining.

When drilling the 3220 case the holes are about 2.15" long. I drill half the hole from each side and it takes about 10 minutes to drill the 60 holes on each end. They meet in
the middle and they overlap so even if they don't meet exactly there is little upset in flow.

[motomoto]

Time to uprade to a 3220, piss the gears off and start pulling power monos

You are right. It's about time I grew a sack and got a 3220 4t. That would be sick. Anyone that has one they
want to sell, send me a PM. I will have that thing on there tomorrow, with a proper shunt and some Nano-tech
batteries. I want to make up some skinny tire wheels and see what kind of top speed I could reach also.

[lostrack]

What's the latest yo? Any more news...?

[recumpence]

Well, I know what he is doing about a bigger motor.

Matt

[Whiplash]

Uh oh! Big boy motor time!

[motomoto]

I think Astro Flight will send me a 3220 4t towards the end of the week, thanks to Matt.

By that time I will have the shunts and new wiring done and some nano techs. I want to do
a new 'run through the gears' video with the bigger motor and the amps turned up.

[lostrack]

I think Astro Flight will send me a 3220 4t towards the end of the week, thanks to Matt.

By that time I will have the shunts and new wiring done and some nano techs. I want to do
a new 'run through the gears' video with the bigger motor and the amps turned up.

What drivetrain are you using? High end or cheap and replaceable? Hopefully all at power isn't eating up your chains and kit...

[motomoto]

It's really just one sprocket pulling another sprocket. I changed the gear ratio for the unit early on when
I had a problem with the chain pulling so hard on the smaller rear sprockets that the chain would jump
a tooth and break. Now the whole system spins faster because I went from a 20 tooth pulley on the motor
to a 32. The largest rear sprocket has a top speed now of 22 mph. You can't help the motor by pedaling
because you would have to spin the cranks at 200+ RPM. When you are pushing 5+ horsepower the pedaling
is negligible anyway. I know I am in a minority, but I like the derailleur system. You can always just spin
everything faster if you want to transmit more power. I am considering making some larger diameter
cassette gears because that is what is really needed. The derailleur I am using is a XTR.

[lostrack]

I think Astro Flight will send me a 3220 4t towards the end of the week, thanks to Matt.

By that time I will have the shunts and new wiring done and some nano techs. I want to do
a new 'run through the gears' video with the bigger motor and the amps turned up.

Any word on that video? Loved the sound of your old one. Reminded me of an F1... (slightly...!)

How's the new astro? I am on track to give mine (direct drive setup) the first launch this weekend.

T