Re: F1D rubber and o-rings

From: Tapio Linkosalo <tapio.linkosalo_at_helsinki.fi>
Date: Tue, 18 Sep 2007 19:59:06 +0300 (EEST)

On Mon, 17 Sep 2007, Fred Tellier wrote:

Thanks, Fred, for many useful notions.

> Your 9+ inch motor will work well when your model looses some weight, I
> use motors around that length except for low ceilings when I go up to 1"
> shorter.

Ok, i'll go shorter to start with, and try to build the next model to
weight. I think my fuse weight is rather good now (had to rebuild, got
bood balsa from mr. Benns), but the prop and wing are too heavy. The wing
goes fine without boron, so that alone is a sign of too sturdy
structure...

> As for torque I always release at full torque both on the F1M
> and F1D. The F1M torque is double F1D torque 1 to 1.2 in oz compared to
> .45 to .55 on the F1D.

I am in the range of 50% of my F1M torques, so the target is not that far.
A lighter model is needed :)

> The stick will take the torque but watch the motor length as it is
> shorter than the motor stick hook to hook length, a spacer might be
> needed to ease the strain on the model.

Good idea. The spacer would also double as a good o-ring to ease handling
the model...

> I use 1/8" OD thin wall high pressure pneumatic tubing for O rings and
> even they will occasionally twist on the prop hook. but their size
> doesn't cause a great problem when I leave them that way for the flight.

How soft is the tubing? Obviously softer than the rigid plastic tubing you
used in 2004? But also harder than rubber o-rings? How wide are your
O-rings?

Thanks,


-Tapio-
Received on Tue Sep 18 2007 - 10:09:22 CEST