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Foo Engineers: Help Me Design a Bicycle Powered Outboard for my Sailboat!

Old 09-19-12, 08:27 PM
  #1  
Tom Stormcrowe
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Foo Engineers: Help Me Design a Bicycle Powered Outboard for my Sailboat!

OK, here are the tech specs:
  1. It needs to be able to generate 200 pounds thrust, which is about the equivalent of 3 HP.
  2. Must be able to push the boat in harbor up to hull speed, about 5.5 knots (around 6 1/2 MPH)
  3. Must be 100% human powered and based on a bicycle


So, let's hear your ideas!

I'm going to give out 2 free Ti memberships.
  1. one for the most actually workable idea
  2. one for the weirdest, funniest system.

Good luck and have fun!
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Old 09-19-12, 08:35 PM
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https://www.torqeedo.com/
+
https://sustainabilityplu.wordpress.c...ike-generator/

Charge the battery with the bike.
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Old 09-19-12, 08:36 PM
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100% human powered, Allen, not hybrid.
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Old 09-19-12, 08:37 PM
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wont happen with 1 human
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Old 09-19-12, 08:41 PM
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3hp is pretty unreasonable for a person. A helical prop run off of a flex shaft is probably your best bet for the end of the power train. You gearing before that will determine a whole lot.
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Old 09-19-12, 08:44 PM
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2 people on board. I can also rig a steering mechanism from the handlebars to the tiller with pull cables. We could use a tandem drive.

Oh, I have 6' of cockpit area to work with, and the system will have to be stowable under sail.
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Old 09-19-12, 08:44 PM
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yes because you are still limeted by the law of conservation of energy
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Old 09-19-12, 08:48 PM
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im reminded the first time i went sailing i went out with the wind and couldn't get back to shore. but i sure had a blast
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Old 09-19-12, 08:55 PM
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Unless you and your SO are rated at 1.5 HP each, you're not going to make it. Lance Armstrong is rated at 0.67 HP.
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Originally Posted by Bjforrestal View Post
I don't care if you are on a unicycle, as long as you're not using a motor to get places you get props from me. We're here to support each other. Share ideas, and motivate one another to actually keep doing it.

Last edited by Artkansas; 09-19-12 at 09:16 PM.
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Old 09-19-12, 09:01 PM
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To repeat, from the OP

I'm going to give out 2 free Ti memberships.

  1. one for the most actually workable idea
  2. one for the weirdest, funniest system.
Translation: Have fun with it. It doesn't have to be a system that is anything other than theoretically possible!
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Old 09-19-12, 09:07 PM
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1hp = 745.699872 watts

This is a mathematical constant. Don't expect that kind of power with two pedallers
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Old 09-19-12, 09:15 PM
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Have it based on a fixed gear drivetrain, 54x12 should do the job get a custom fork made that is shaped like dual rudders. and use a direct mount stem on it.
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Old 09-19-12, 09:18 PM
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Originally Posted by tom stormcrowe View Post
to repeat, from the op

i'm going to give out 1 free ti membership.

  1. one for the weirdest, funniest system.
translation: Have fun with it. It doesn't have to be a system that is anything other than theoretically possible!
fify
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"He who serves all, best serves himself" Jack London

Originally Posted by Bjforrestal View Post
I don't care if you are on a unicycle, as long as you're not using a motor to get places you get props from me. We're here to support each other. Share ideas, and motivate one another to actually keep doing it.
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Old 09-19-12, 09:20 PM
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Simplest system. Attach a bar to the back. Have 12 mermaids from Silver Springs swimming behind the boat, pushing it along. As their coxswain, you may pedal a folding exercise bicycle on deck.

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"He who serves all, best serves himself" Jack London

Originally Posted by Bjforrestal View Post
I don't care if you are on a unicycle, as long as you're not using a motor to get places you get props from me. We're here to support each other. Share ideas, and motivate one another to actually keep doing it.

Last edited by Artkansas; 09-19-12 at 09:49 PM.
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Old 09-19-12, 09:22 PM
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u could use a generator mounted on a exercise bike in ya free time use the bike storing power in a battery. and then use batt to power a trolling motor id guess 12 hours of hard pedaling would give u 1 hour at 3 hp
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Old 09-19-12, 09:22 PM
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42.

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Old 09-19-12, 09:42 PM
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My system involves massive amounts of EPO and will have you banned from most major regattas and more than a few sailor bars by USADA. You will also have to remove one of your testicles, but not permanently.
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Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
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Old 09-19-12, 09:43 PM
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Also, I am not an engineer, I just joy ride in locomotives. A lot.
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Originally Posted by colorider View Post
Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
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Old 09-19-12, 09:56 PM
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Tom, talk to Warren Beauchamp*, the administrator for the recumbents.com site. He's built a few HPB's, and raced them at their Hydrobowl:
https://www.recumbents.com/wisil/hpb/boat.htm

I've tried one, but I've never built my own system:



*pronounced "Shrimpboat"
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Old 09-19-12, 10:00 PM
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Originally Posted by jsharr View Post
Also, I am not an engineer, I just joy ride in locomotives. A lot.
When you gonna visit Portland? https://www.4449.com/
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Old 09-19-12, 10:15 PM
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So, I feel like this merits an explanation. You pedal, and it turns the wheel. That turns the drum, and that drives a shaft that just moves up and down, which propells the faux dolphin tail, which makes the boat go.
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That would be spectacular. A trail of blood and sealant.
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Old 09-19-12, 10:23 PM
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Absolutely no way are you going to pull 2250W with one human being for any length of time. Other than that...

I would pick up one of those Dynamic shaft-drive bikes (they are cheap enough), remove the gearbox at the rear, mount it to the deck with dual QR axle mounts and run the driveshaft to a propeller. When under sail, disconnect shaft and QR mounts and stow. Maybe I can make a picture tomorrow when I am back in the office.
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Old 09-19-12, 11:19 PM
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Why make it stowable? Ditch the outboard. Install a paddle wheel linked to two tadpole 'bents.
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Old 09-20-12, 07:17 AM
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Old 09-20-12, 07:18 AM
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