Re: Re: question for Don S.; weight vs air loads

From: Nick Ray <lasray_at_gmail.com>
Date: Thu, 20 Aug 2009 20:50:45 -0400

Just to put some numbers together say you have a .1inch/ounce motor.
then 2.8349523grams = .1 ounces and the inches cancel so you'd have >3.0
grams of deflection force trying to deflect the post. This seems to jive
with what I've actually seen. It seems like this would be easy to test by
seeing how much deflection you get from a motorstick with a full motor wind
and how much deflection you get when you hang a weight equal to your torque
from one of the post on the stick. (sideways of course)

On Thu, Aug 20, 2009 at 8:42 PM, Nick Ray <lasray_at_gmail.com> wrote:

> I may be off the mark here but, If the model weights 5 grams and the lift
> is slightly greater than the model weight then the forces approximately
> cancel. So it should be like >.5 grams tension and at most the torsional
> force of the motor over the distance between the post. As expected the
> torsional force would be the bigger issue. Nick
>
>
> On Thu, Aug 20, 2009 at 7:44 PM, f1diddler <f1diddler_at_yahoo.com> wrote:
>
>>
>>
>> --- In Indoor_Construction_at_yahoogroups.com<Indoor_Construction%40yahoogroups.com>,
>> hermann andresen <hermanna_at_...> wrote:
>>
>> > "To measure is to know." Lord Rayliegh
>> >
>> > Try some strain gages.
>>
>> Herm,
>> How would you do that in flight, on an indoor weight FF?
>> MB
>>
>> "To measure is to want more tools."
>> Mark F1diddler
>>
>>
>>
>
>
Received on Thu Aug 20 2009 - 17:51:36 CEST