Prop Pusher E-bikes

Discussions related to motors other than hub motors.
This includes R/C motors, botttom bracket, roller and geared drives.
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D-Man   1 MW

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Prop Pusher E-bikes

Post by D-Man » Sep 28 2013 3:07pm

These things are pretty fast. I might stick one on my road bike. It would be like turbo boost.

https://www.youtube.com/watch?v=f0F01vR-uac

https://www.youtube.com/watch?v=f_-9OwOM4cc
408 front hub
21000+ miles on many sla's.
5 tires worn out

D-Man   1 MW

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Re: Prop Pusher E-bikes

Post by D-Man » Sep 28 2013 6:33pm

408 front hub
21000+ miles on many sla's.
5 tires worn out

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EVTodd   10 kW

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Re: Prop Pusher E-bikes

Post by EVTodd » Sep 29 2013 6:57pm

Looks pretty safe. :roll: I think I'll stick with friction drive. lol
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D-Man   1 MW

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Re: Prop Pusher E-bikes

Post by D-Man » Sep 29 2013 11:23pm

I like the tandem bike. Big motor on that. I'd put a cage around the prop in case it breaks. There are some people using the Rc jet turbine on bikes but those cost a fortune.
408 front hub
21000+ miles on many sla's.
5 tires worn out

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Dauntless   100 GW

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Re: Prop Pusher E-bikes

Post by Dauntless » Sep 29 2013 11:35pm

Image

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.

Image

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.

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D-Man   1 MW

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Re: Prop Pusher E-bikes

Post by D-Man » Sep 29 2013 11:47pm

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.
408 front hub
21000+ miles on many sla's.
5 tires worn out

Timmey   10 mW

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Re: Prop Pusher E-bikes

Post by Timmey » Sep 30 2013 1:25am

Friend of mine built this one.

http://www.youtube.com/watch?v=ary5f7lU880

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cal3thousand   1.21 GW

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Re: Prop Pusher E-bikes

Post by cal3thousand » Sep 30 2013 1:42pm

That would keep those pesky cars at a safe distance. Any car gets too close and they'll need a paint job.
Get a Cycle Analyst and a Multimeter, you're still a noob if you don't have at least one of each.

Planning on posting questions or buying anything on this site? Put up your country (at minimum) on your profile. This is a worldwide forum and we haven't reached clairvoyance.

D-Man   1 MW

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Re: Prop Pusher E-bikes

Post by D-Man » Sep 30 2013 1:49pm

408 front hub
21000+ miles on many sla's.
5 tires worn out


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cal3thousand   1.21 GW

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Re: Prop Pusher E-bikes

Post by cal3thousand » Oct 04 2013 4:48pm

My question is WHY?

I hope it's for Sh*ts and giggles.
Get a Cycle Analyst and a Multimeter, you're still a noob if you don't have at least one of each.

Planning on posting questions or buying anything on this site? Put up your country (at minimum) on your profile. This is a worldwide forum and we haven't reached clairvoyance.

PaulQwerty   100 µW

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Re: Prop Pusher E-bikes

Post by PaulQwerty » Oct 05 2013 10:22am

http://www.youtube.com/watch?v=bDVcecoC_f0

This was built by "The Gadget Show" in the UK.

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sk8norcal   100 MW

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Re: Prop Pusher E-bikes

Post by sk8norcal » Oct 05 2013 11:36am

a bit more infor here,
http://bigconkers.com/projects/big-conk ... c-jet-bike
Over a few days at the Robo Challenge workshop we designed and built this bike using 6 x Electric ducted fan's and LOADS of Lithium batteries.

Each EDF jet kicks out over 5000W! totalling 30kw (40hp). To power these beasts we used the best and lightest Lithium batteries we could find. OptiPower had the answer - 12x 22.2vs 5000mA packs in total, each costing £110. These packs are designed for high performance flying models.
Image

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Lock   10 GW

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Re: Prop Pusher E-bikes

Post by Lock » Oct 05 2013 12:36pm

sk8norcal wrote:old thread on this,
http://endless-sphere.com/forums/viewto ... =3&t=30984
Ummm... That thread approx two years old, and still no product for sale yet?

Kinda a clue...
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Canada, eh?

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sk8norcal   100 MW

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Re: Prop Pusher E-bikes

Post by sk8norcal » Oct 05 2013 4:18pm

cal3thousand wrote:My question is WHY?

I hope it's for Sh*ts and giggles.
they are trying to go retro :wink:

Image

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jansevr   1 kW

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Re: Prop Pusher E-bikes

Post by jansevr » Oct 05 2013 4:33pm

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).

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Lock   10 GW

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Re: Prop Pusher E-bikes

Post by Lock » Oct 05 2013 6:17pm

sk8norcal wrote:
cal3thousand wrote:My question is WHY?

I hope it's for Sh*ts and giggles.
they are trying to go retro :wink:
Ummmm... More "retro" than 1913?
Image

:lol:
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sk8norcal   100 MW

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Re: Prop Pusher E-bikes

Post by sk8norcal » Oct 05 2013 7:44pm

1914 AeroThrust

D-Man   1 MW

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Re: Prop Pusher E-bikes

Post by D-Man » Oct 06 2013 9:36am

jansevr wrote: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. .
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.
408 front hub
21000+ miles on many sla's.
5 tires worn out

D-Man   1 MW

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Re: Prop Pusher E-bikes

Post by D-Man » Oct 06 2013 10:27pm

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.
408 front hub
21000+ miles on many sla's.
5 tires worn out

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