On Mar 25, 3:50 pm, "Douglas Eagleson" <eaglesondoug...@yahoo.com>
wrote:

Well. Placing the whole contraption the car roof and then trying to
get a pc camera to view the little weight scale was attempted.

A set of data was attempted, but the weight scale bounced arround to
much at 20 mph.

ANd the tar function of the weight scale reared it head. I evidently
misunderstood. It has a negative display without showing a negative
symbol. It uses the tare sign.

So on closer retrial on a 12 volt car inverter.

2 lbs 2 oz. single propellor static thrust
2 lbs 1 oz. double propellor static thrust

A slight advantage +/- 1 oz.

I am at a loss to test the thing now

a basic idea was

20 mph 1 lbs +/- 5 oz either propeller

It was impossible to tell. The tare problem confounded the whole car
speed runs.

If I get a leaf blower does the same experiment occur?

I have a small table with an electric hand drill on a plank. ANd the
scale measures the table to plank horizontal force. And the plank was
on the car roof at 0 and 20 mph

Does inertia count?

Experimenting really stinks. Getting data is hard. Blowing the leaf
blower with a wind velocity meter will do something, but it is not the
same. Well I need to rummage arround thinking wise I guess.

A speed at which the forward thrust is zero was the idea behind using
a car. The little table has to fly along with the car! And it bounces
arround to much to get data.

A top speed as a true model airplane is possible. A gps in amodel
would give the top speed. BUt it gets all complicated. I have no
airplane and the 18 inch propellers would make a large airplane?- Hide quoted text -

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