Prop Pusher E-bikes
- Thread starter D-Man
- Start date
I think I'll stick with friction drive. lol
Dauntless
100 TW
How convenient they're so small anymore. What would the ducted fan sleigh of Russian Grand Duke Cyril Vladimirovich have looked like if they could have built them like that over 100 years ago.
This was built by the man who came up with the Coanda effect. The idea is that an important part of the operation of the ducted fan is the way it blows across the body of, say, the plane he built in 1910. Could it really have flown? In Romania they claimed that, either accidently or deliberately, Henri Coanda found his taxi testing turning into a flight. Some say that plane could never fly, but that might not keep in from jumping off the ground and sailing into a wall. If you believe his engine is a jet, then you believe he made the first jet flight, possibly farther than the Wright Brothers first flight.
If he did succeed in even sort of flying that first plane, you have to wonder why he didn't build a second. Or did he, there are magazine photographs said to be taken after the accident, plus an article naming a later buyer. But it was never to be seen again.
Be real careful if you read about the debunkers of the 1950's, there were many wild claims about the plane that Coanda himself wasn't responsible for. He talked of wanting to add what amounted to an afterburner but never got the chance, etc.
During World War II Germany had him working on ducted fan snowmobiles. You have to wonder if the people behind the German stealth fighter project had any idea that they had the world's foremost expert on the ducted fan engine working for them nearby. Imagine if they got this thing flying during the war. I wonder how small the little motors would be today.
If you look at some of the comments from "harvey" on that tandem bike:
Motor is a Hacker A-150 with a 29x12 Mejzlik carbon fiber prop. In this clip it is powered by 12S2P thunder power Li-Po batteries. Have since bumped it up to 14S2P and switched to a Vess 27C Prop.
Static pull tests average 50 Pounds of thrust plus or minus 5 pounds.
I have since added a second motor and need to get it out on the highway to get you a speed check.
One r/c car transmitter controls 2 different receivers with the same crystal.
speed with one motor was 167 mph
speed with 2 motors was 175 mph
air resistance is a large barrier
speed is limited by propeller pitch as it exists.
unlike combustion engines, electric motors turn a given rpm per volt.
there is no rpm gain with speed.
right now the bike will do 75.5 mph with 2 of these motors in pusher configuration.
I would need more prop pitch to go faster but I am getting a lot of worried looks from my friends as it is.
the motor is a 3 phase AC so you just switch any two wires and the motor and prop both turn backwards.
Motor is a Hacker A-150 with a 29x12 Mejzlik carbon fiber prop. In this clip it is powered by 12S2P thunder power Li-Po batteries. Have since bumped it up to 14S2P and switched to a Vess 27C Prop.
Static pull tests average 50 Pounds of thrust plus or minus 5 pounds.
I have since added a second motor and need to get it out on the highway to get you a speed check.
One r/c car transmitter controls 2 different receivers with the same crystal.
speed with one motor was 167 mph
speed with 2 motors was 175 mph
air resistance is a large barrier
speed is limited by propeller pitch as it exists.
unlike combustion engines, electric motors turn a given rpm per volt.
there is no rpm gain with speed.
right now the bike will do 75.5 mph with 2 of these motors in pusher configuration.
I would need more prop pitch to go faster but I am getting a lot of worried looks from my friends as it is.
the motor is a 3 phase AC so you just switch any two wires and the motor and prop both turn backwards.
Timmey
10 mW
Friend of mine built this one.
http://www.youtube.com/watch?v=ary5f7lU880
http://www.youtube.com/watch?v=ary5f7lU880
cal3thousand
10 MW
That would keep those pesky cars at a safe distance. Any car gets too close and they'll need a paint job.
sk8norcal
1 MW
D-Man said:
sweet!!
aerobicycle
http://www.ringpen.com/aero/
old thread on this,
http://endless-sphere.com/forums/viewtopic.php?f=3&t=30984
related, dreamscience
http://endless-sphere.com/forums/viewtopic.php?f=7&t=50749
cal3thousand
10 MW
My question is WHY?
I hope it's for Sh*ts and giggles.
I hope it's for Sh*ts and giggles.
PaulQwerty
100 µW
http://www.youtube.com/watch?v=bDVcecoC_f0
This was built by "The Gadget Show" in the UK.
This was built by "The Gadget Show" in the UK.
sk8norcal
1 MW
a bit more infor here,
http://bigconkers.com/projects/big-conkers-electric/electric-jet-bike
http://bigconkers.com/projects/big-conkers-electric/electric-jet-bike
Lock
100 MW
sk8norcal said:
Ummm... That thread approx two years old, and still no product for sale yet?
Kinda a clue...
L
sk8norcal
1 MW
cal3thousand said:
they are trying to go retro :wink:
jansevr
1 kW
30kw on a road bike and all they can manage is under 80? don't get me wrong this is still dangerous as hell for what it is. its one thing to go 80 on a heavily modified downhill bike - but really!? - a road bike?! other than the fact that this is stupid as hell - why waste so much power...why not put that 30kw straight to the wheel. john in cr has gone over 100mph with a total load of easily 2-3 times that and with less power (probably closer to 20kw - from his hub motor).
Lock
100 MW
sk8norcal said:
Ummmm... More "retro" than 1913?
:lol:
L
sk8norcal
1 MW
1914 AeroThrust
jansevr said:
Maybe tone that road bike down to 45 mph which would be like an olympic level sprinter. They don't say what motor/fans those are. It would be interesting to know what speeds you get as you add additional motors. Maybe it would take only 3 motors and not much money.
From what I've read, the large scale electric ducted fan motors put out like 10-15lbs of thrust each.
So 6 motors = 60 - 90lbs thrust.
Doesn't seem like that much for 80 mph.
But it seems that all you need is 6-10lbs worth according to wind tunnel tests on TT bikes for 30 mph.
So maybe all you really need is 1 or 2 motors.
Swamp boats can put out 1000lbs of thrust with a Big V8 and prop.
So 6 motors = 60 - 90lbs thrust.
Doesn't seem like that much for 80 mph.
But it seems that all you need is 6-10lbs worth according to wind tunnel tests on TT bikes for 30 mph.
So maybe all you really need is 1 or 2 motors.
Swamp boats can put out 1000lbs of thrust with a Big V8 and prop.
