I have used rail buttons machined out of delrin in the past which seemed to
work well. I've mostly used a smaller size that fits into 80/20 extrusion and
a larger size that fits into unistrut.
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> On Behalf Of
Robert Watzlavick
Sent: Wednesday, July 29, 2020 8:42 PM
To: arocket@xxxxxxxxxxxxx; Kevin Ho <rebelwithoutajob@xxxxxxxxxxx>
Subject: [AR] Re: Modeling liquid engine aft body in OpenRocket
I was going to follow the FAR guidelines for the Baxter launcher, placing one
at the CG and one at the aft end of the body. I've seen other references that
suggest one at the CG and one at the CP. The skin is very thin (0.016 inches)
so I'm going to have to add stiffeners underneath.
I'd really like to 3D print the rail guides out of nylon but I'm worried the
steel rail will cut through it so I'll make them out of aluminum.
-Bob
On 7/29/20 7:17 PM, Kevin Ho wrote:
IIRC you are using a long rail, which should reduce weathercocking to
a certain extent. Longer rails means higher off-rail speed, which
means that even in a wind gust your relative wind will shift by less
degrees off the nose.
Also a controversial topic, but where are your rail buttons going to
be? That can greatly affect off-rail weathercocking. Placing the aft
button close to the CP can reduce the swing somewhat.
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