Result from testing of Rule 1100 with graupner propeller

Anything to do with Propulsion.
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Kjetil
Posts: 65
Joined: Dec 11th, 2010, 4:18 pm
Location: Norway

Result from testing of Rule 1100 with graupner propeller

Post by Kjetil »

Have done som testing with Rule 1100 and Graupner propellers that may be of interest for others.

Used a car start buster to get a stabil and strong supply for the test.

Test setup
bilde 1.JPG
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bilde 2.JPG
bilde 2.JPG (436.19 KiB) Viewed 3202 times
bilde 3.JPG
bilde 3.JPG (453.29 KiB) Viewed 3202 times
Test result:
Propeller thrust.jpg
Propeller thrust.jpg (69.43 KiB) Viewed 3202 times
fluxno
Posts: 83
Joined: Nov 24th, 2012, 9:52 am
Location: Norway

Re: Result from testing of Rule 1100 with graupner propeller

Post by fluxno »

very nice information. the test show nicely that the motor becomes very inefficent when it have to large propeller. from quick calculations, the first(smallest) propeller is the most efficient.
if youre using a spreadsheet, maybe you could do a calculation to show trust per Amp. this is a good figure to show how efficient the props are with the motor.
Kjetil
Posts: 65
Joined: Dec 11th, 2010, 4:18 pm
Location: Norway

Re: Result from testing of Rule 1100 with graupner propeller

Post by Kjetil »

Now with thrust/amp and prices.
propeller 2.jpg
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onibnasir
Posts: 21
Joined: Jul 25th, 2012, 4:06 am

Re: Result from testing of Rule 1100 with graupner propeller

Post by onibnasir »

How did you calculate the force?
fluxno
Posts: 83
Joined: Nov 24th, 2012, 9:52 am
Location: Norway

Re: Result from testing of Rule 1100 with graupner propeller

Post by fluxno »

onibnasir wrote:How did you calculate the force?
its measured with a weight. you see it on the second picture, just below the headligth of the car.

he's using the same principle as in this guide: http://www.homebuiltrovs.com/howtotethe ... edrop.html
martinw
Posts: 91
Joined: Sep 20th, 2011, 11:02 am
Location: Aberdeenshire

Re: Result from testing of Rule 1100 with graupner propeller

Post by martinw »

Hi Kjetil,

I presume you took into account the ratio between the pivot point, the point you're measuring the force and the point the bilge pump is acting on, it looks about 2 to 1 from the pictures, but it isn't too easy to see.

I'm interested as I've done similar tests myself, albeit with a home made propeller and thruster.

http://martin-wareham.blogspot.co.uk/

Martin
Kjetil
Posts: 65
Joined: Dec 11th, 2010, 4:18 pm
Location: Norway

Re: Result from testing of Rule 1100 with graupner propeller

Post by Kjetil »

I did calculate out the correct force, I do not remember the ratio at the moment. It was more that 2 to 1.
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