![Thanks](https://www.renovateforums.com.au/dbtech/thanks/images/thanks.png)
![Likes](https://www.renovateforums.com.au/dbtech/thanks/images/likes.png)
![Needs Pictures](https://www.woodworkforums.com/images/smilies/happy/photo4.gif)
![Picture(s) thanks](https://www.ubeaut.biz/wave.gif)
Results 1 to 11 of 11
Thread: need help on project
-
12th January 2009, 01:02 AM #1
need help on project
I'm looking for help with a project l am doing with disengaged teenagers at high school
all the branches meet for a humane powered boat race at the end of the school year so far my school has had a DNF and a mid field ending
l ask you how hard is rowing
so this year I'm fitting a bikes to run a prop
The idea so far is remove the spokes from the rear wheel and bolt the gear that is near the pedals instead of the rim that way l can still use the gears on the 10 speed
then chain drive the rear shaft though a small bike gear ,then will run it though a diff (maybe one off a ride on mower )
now two questions what is a good prop for the speed that l can get my student make with this set up ??
2ND question but one more important how do you the rear gear off the hub ,there is a bearing on top ,no way of getting under it
had a test hit sitting the gear on the vice and hitting a nut washer thing inside the gear
worked out most of the other stuff if l cant get a mower diff free l may have to make one
hay is there a formula for gearing rpm= trust
may get the science class involved testing the beast
l may make it a wip if anybody is interested
simple boat plans would help
or ideas how to get more speed the thing is the whole job has to cost only 100$smile and the world will smile with you
-
12th January 2009, 07:58 AM #2
-
12th January 2009, 12:18 PM #3
-
12th January 2009, 02:59 PM #4
made tool to fit nut inside gear assembly question do you hold the gear or the wheel hub
smile and the world will smile with you
-
12th January 2009, 03:21 PM #5
SENIOR MEMBER
- Join Date
- Nov 2006
- Location
- t
- Posts
- 79
Can't help with your questions, but a few thoughts
Humane powered is different to human powered
How about paddle wheels or wheel instead of a prop, much easier to fix than a prop.
Use a small diff to transfer power from bike to prop shaft.
Been watching to much Scrap heap challenge.
-
12th January 2009, 05:40 PM #6
-
12th January 2009, 05:46 PM #7
new computers arrrrrrrrrrrrrrrrrr
smile and the world will smile with you
-
12th January 2009, 06:49 PM #8
-
12th January 2009, 09:13 PM #9
-
12th January 2009, 09:43 PM #10
I reckon you could use a bit of 3mm x 50mm flat.
Drill a hole in the centre of a suitable length to mount to a drive shaft.
Hold the flat in a metal vice over the hole, whack a 12" shifter on the end of the flat thats sticking up and twist the bar. Turn it over and do the same thing again.
I'd reckon that 150-200mm would be all thats needed.
I'd file all sharp edges and corners.
Its rough but its only going to spin slowly being pedal power so it should do
-
13th January 2009, 11:14 AM #11
thanks
will make one like that
thinking l will rig up a test bath so l can measure the force some howthen we can keep making props and gears and make a graph of the out comes
would 10mm drive shaft be ok to use then l can use axles from the front wheels or is it to thinsmile and the world will smile with you