Re: prop testing

From: hermbarb <hermanna_at_hotmail.com>
Date: Wed, 30 May 2007 10:16:55 -0000

Rocket scientist, Chuck Lindley (PhD Caltech) used a pendulum to
measure static thrust of a number of props for the E-30 event
(ungeared electric w/2, 50mAh NiCads promoted by Tony Nacaratto).

With the low advance ratio, static thrust works well for this situation.
Chuck had many curves of thrust vs time, used to select optimum for
application. Worked in both Tustin blimp hanger and Burbank gym.

Then Chuck went off to work on X-prize.

Very Scientific,
                H
 

--- In Indoor_Construction_at_yahoogroups.com, Neil Dennis <wombatt@...>
wrote:
>
> Wonder, has anyone tried a ballistic pendulum to measure prop
"force" or
> pull ?
>
> If using an electric motor geared down of course, the current draw
> should give a good indication of the motor load.
>
> wombat
>
Received on Wed May 30 2007 - 03:18:07 CEST