What do you use for the rubber bladder Bill? How closely must it be
shaped
to the final planform of the prop blade? Can a section of bicycle inner
tube
be used?

Send me some sketches on this process. Would it help if a flat wood
insert
was placed in the rubber bladder the shape of the prop

blade plan form?

Paul Lamar

Paul, as with most things , it depends on several things. The material 
for the bladder can't be bike inner tube since it needs to resist the heat 
of cure. Around 250°F. There are several silicone tubes that will work. 
A simple tube will work if you use a flexible rubber.
Bill Jepson

 
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