What to use to make a mold?

At 14:35 26 March 2009, The Real Doctor wrote:

He has said elsewhere, I think, that this is for placing under him.
And he could fasten the cushion down.

I would be worried about the design strength of any fastenings to flimsy
seat pans during high g impact decelerations.

In general yes, but surely it depends entirely on the glider's weight,
balance and limits?

If it's for C of G positioning then the further forward the less mass
needed. You may exceed the all up weight limit with sufficient mass at
the seat lever arm for CG positioning; also I'd not be particularly happy
about speed performance ballast I couldn't get rid of in the air if I
ended up low and scratchy!

On 26 Mar, 21:00, Z Goudie wrote:
At 14:35 26 March 2009, The Real Doctor wrote:

He has said elsewhere, I think, that this is for placing under him.
And he could fasten the cushion down.

I would be worried about the design strength of any fastenings to flimsy
seat pans during high g impact decelerations.

I'd be concerned about doing them right...

In general yes, but surely it depends entirely on the glider's weight,
balance and limits?

... I'd not be particularly happy
about speed performance ballast I couldn't get rid of in the air if I
ended up low and scratchy!


Having spent 5 hours 4 minutes sitting on a 1/4" lead sheet in a Club
Libelle below 2000' in France, I can assure you that "low and
scratchy" takes on a whole new meaning.

Ian