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
Test result:
Result from testing of Rule 1100 with graupner propeller
Re: Result from testing of Rule 1100 with graupner propeller
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.
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.
Re: Result from testing of Rule 1100 with graupner propeller
Now with thrust/amp and prices.
Re: Result from testing of Rule 1100 with graupner propeller
How did you calculate the force?
Re: Result from testing of Rule 1100 with graupner propeller
its measured with a weight. you see it on the second picture, just below the headligth of the car.onibnasir wrote:How did you calculate the force?
he's using the same principle as in this guide: http://www.homebuiltrovs.com/howtotethe ... edrop.html
Re: Result from testing of Rule 1100 with graupner propeller
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
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
Re: Result from testing of Rule 1100 with graupner propeller
I did calculate out the correct force, I do not remember the ratio at the moment. It was more that 2 to 1.