j3tch1u
10 kW
great job! the bike looks stunning..and you've got just enough space for a third motor!
quad motor quadangle anyone?
quad motor quadangle anyone?
Twin motored PK Ripper--A little over the top!
- Thread starter recumpence
- Start date
recumpence
1 GW
j3tch1u said:
You noticed that too?
I have extra controllers sitting here. So, for the price of one more motor ($300) and tw more pounds, I can increase my power by 50%.
Oh, that reminds me, the bike weighs in at an even 45 pounds with all equipment! Hmm, 3 pounds per horsepower!
Matt
johnrobholmes
10 MW
I am really tempted to pick one of those motors up instead of using the 1915 I bought.
recumpence
1 GW
If you do, just let me know. I can setup your drive for the Astro. :wink:
Matt
Matt
MitchJi
10 MW
Hi Matt,
Awesome build! (More than a little over the top
).
Seems like perfect material for battery boxes. Are sheets available for purchase?
If so:
What is required to cut them to size, can they be cut without applying fresh CF on the edges?
Roughly what do they cost?
Thanks!
Mitch
Awesome build! (More than a little over the top
). recumpence said:
Seems like perfect material for battery boxes. Are sheets available for purchase?
If so:
What is required to cut them to size, can they be cut without applying fresh CF on the edges?
Roughly what do they cost?
Thanks!
Mitch
MitchJi
10 MW
Thanks Miles!
Mitch
Mitch
recumpence said:Oh, that reminds me, the bike weighs in at an even 45 pounds with all equipment! Hmm, 3 pounds per horsepower!
Matt
So, theoretically, at a "local minimum"(Due to lack of global knowledge) a 400 HP equivalent would only run at 1200 pounds. Not bad!
Edit: Hmmmm... whoops. Forget the base weight, before adding the extra equipment, doesn't necessarily scale linearly with power. So it could likely be a lot less, like... maybe... 600 pounds, I guess. I don't really know.
recumpence
1 GW
Miles said:
Dragon Plate is the most expensive CF place on the planet! They are asking $30US for 1/4 a square foot. I pay (or I did a year ago when I bought this panel) $170 US for 3 square feet.
It is crazy expensive stuff, no doubt. But, when I was making alot of heli parts, I could get 12 heli main keels out of one sheet.
I just had this panel laying around that I could use.
Oh, you can cut CF with a carbide tipped table saw blade. You cannot cut it with a sabre saw. The blade will dull in about 6 inches of cut.
Matt
voicecoils
1 MW
I can't wait to see some footage of your bike running In the mean time, to get you pumped to ride, check this video out:
(I know you're not strictly building a trials bike, but I think you'll like this one)
[youtube]Z19zFlPah-o[/youtube]
There's a trick at ~3:05 min in that I'm hoping you'll try on the PK :wink:
In the mean time, to get you pumped to ride, check this video out:(I know you're not strictly building a trials bike, but I think you'll like this one)
[youtube]Z19zFlPah-o[/youtube]
There's a trick at ~3:05 min in that I'm hoping you'll try on the PK :wink:
MitchJi
10 MW
Hi Matt,
Did you purchase from Dragon Plate or do you have another source? If so mind posting it?
Thanks for the tip on cutting.
recumpence said:
Did you purchase from Dragon Plate or do you have another source? If so mind posting it?
Thanks for the tip on cutting.
recumpence
1 GW
DA graphite is the best place. Tell Dave and Robin Matt sent you. :wink:
Matt
Matt
GGoodrum
1 MW
Man, what a video! Amazing moves he does on that thing. 
Very good camera work too, btw. I'm usually not into videos with music, but for this one, it works.
-- Gary
Very good camera work too, btw. I'm usually not into videos with music, but for this one, it works. -- Gary
StudEbiker
100 kW
Wow! That Danny MacAskill video is insane 
Thank you for posting!!
Thank you for posting!!
recumpence
1 GW
swbluto said:
I have the pack all wired up and all mechanical work done. I realized I was missing a couple key electronic parts, so I am waiting on those. I also went out of town last weekend and ended up sick as well.
I will also be out of state this weekend. But, I expect to have it running by middle of next week.Matt
mud2005
10 kW
Hi Matt, I was wondering how many teeth are on the drive sprocket? what do you think is the lowest number of teeth that can handle the high rpm without being to loud? I have a 16T on my motor and I need to go smaller, but I'm not sure how small.
edit: I just realized your running 6-turn motors(225Kv) at 48 volt for ~10,800rpm. seems like high rpm for chain, is there a reason you didn't use belt drive for the first reduction?
edit: I just realized your running 6-turn motors(225Kv) at 48 volt for ~10,800rpm. seems like high rpm for chain, is there a reason you didn't use belt drive for the first reduction?
liveforphysics
100 TW
I run a pair of 8tooth sprockets with #35 roller chain. It really doesn't seem buzzy or noisy at all, but I may be more tolerent of noises than most folks.
-Luke
-Luke
recumpence
1 GW
mud2005 said:
Higher RPM with a lower reduction gives much more power.
One of my standard toothed 5mm pitch belts are only good for about 7kw max. This drive would have shredded them.
If it is too noisey, I can look into a heavier pitch belt. However, it should be fine.
Oh, these motors will probably run about 8,000 RPM under load.
Matt
mud2005
10 kW
awesome, I have a feeling your PK is going to run like a 2 cycle dirt bike with nitrous.
recumpence
1 GW
It should be close to that.
A KX60 has about the same power as my PK. But, my PK has HUGE torque and 1/3 the weight.
It should be a monster!
I am bumming, though. I am still waiting on a couple bits and I will be out of state this weekend (again). So, no joy untill next week.
Matt
A KX60 has about the same power as my PK. But, my PK has HUGE torque and 1/3 the weight.
It should be a monster!
I am bumming, though. I am still waiting on a couple bits and I will be out of state this weekend (again). So, no joy untill next week.
Matt
Hmmmm? It seems in general that the online community believes 50cc is less than 2 hp. This thing seems to be designed to handle ~12hp(~10kw)! How can it be compared it to a 60cc bike?
Just checked google. 10 kW is 13.4 hp.
Edit: Once again, I seem to found evidence that reverses my perception.
http://www.bikez.com/motorcycles/kawasaki_kx_60_2002.php
It seems that the kx60 is designed for 10kW. How can a 60cc do that when a 50cc seems so much weaker?
Just checked google. 10 kW is 13.4 hp.
Edit: Once again, I seem to found evidence that reverses my perception.
http://www.bikez.com/motorcycles/kawasaki_kx_60_2002.php
It seems that the kx60 is designed for 10kW. How can a 60cc do that when a 50cc seems so much weaker?
