Rowlandyou could try some tunsten carbide grinding dust from you local tool
grinder?Mixed with a little epoxy its heavier than lead.Also polish off so
me of the paint, at the trailing edge will have most effect of course.
Graham
On Tuesday, 29 August 2017, 17:27, Rowland Carson <rowlandcarson@gmail.
com> wrote:
>
Having got my ailerons back from the painter, I weighed them. The port one
was 2480g before filling, profiling & painting; that whole process has adde
d 625g to make it now 3105g. The starboard one was 2495g, and gained 670g t
o make it 3165g. The paint was 2-pack automotive which I was assured would
turn out much lighter (and cheaper!) than the gel-coat I had originally env
isaged.
I started into the balancing procedure described in the manual. I found my
hinges are not quite free enough to let the ailerons swing freely from them
, so I made loops of nylon fishing line, put them under the hinge knuckles
and suspended the ailerons from them. Alas! - both the ailerons balance wit
h the TE slightly down. I find that if I put a lead weight on one horn, I c
an make the aileron balance level. My piece of lead weighs 366g and level b
alance is obtained with it about 50mm forward of the hinge line.
Thus the out-of-balance moment towards the TE is 0.0183 metre-kg. I wonder
if there is any tolerance on the amount of out-of-balance that is allowed o
r is safe - but I don=99t want to take any chances with flutter.
Avid readers of my online build journal will recall that in May 2003, on ad
vice from Neville about getting the proper aileron travel, I shaved a littl
e off the top of the lead weights before attaching them to the aileron horn
s. It now appears that either I must have shaved too much or that the paint
ing has been much more generous than Neville expected.
What should I do? I suppose the ideal thing is to rub down all the paint ba
ck to the glass/filler again and ask the painter to put on a lighter coat.
I don=99t have access to depleted uranium to insert into the mass hor
ns to make them heavier!
I hope I might see Andy Draper at the LAA Rally and ask for his advice, but
would welcome any thoughts others on this forum might have on the matter.
in friendship
Rowland
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