On Jun 11, 8:22=A0pm, Ted Campanelli <tc...@[EMAIL PROTECTED]
> wrote:
> Ted shuffled out of his cave and grunted these great (and sometimes not
> so great) words of knowledge:
>
> > Hi All,
>
> > =A0 =A0Still working on a Senior Telemaster, and am planning on using
an=
> > OS-61 for power. =A0After getting the wing mounted on the fuze, I'm
> > wondering if a .61 is big enough? =A0Anyway, my question is how big a
> > prop can I use. =A0Prior plane was a 60 size trainer, and I used a
12x6
> > prop, and it seemed to work ok. =A0Do you think I can use a 13x5 on
this=
> > plane/engine combo??? =A012 x 6 =3D 72, and 13 x 5 =3D =A065 so power
se=
ems
> > about the same. =A0I'm looking for take-off performance, not top
speed.
> > Maybe even a 14x5 if I found one????? =A0Can you go too far with this?
>
> > Thanks for any input.
>
> The 61 is plenty for this bird - the specs only call for a 45 - 60.
>
> You should be OK with the 13x5.
>
> 2 things you need to be aware with the prop though:
>
> 1. =A0Over revving of the engine. =A0The larger diameter will act as a
> flywheel to help keep the rpms in line even though the lower pitch will
> allow the engine to rev up.
>
> 2. =A0Ground clearance. =A0You should have a MINIMUM of 1 1/2" (2"+
> preferred) between the end of the prop and the ground when the plane is
> level. =A0A lot will depend on if you are flying off of grass or
pavement
> and how much flex the landing gear has.
Thanks for the input. I'll check the prop clearence when I get the
gear installed, shoot for 2 inches. I have use of the taxi way at the
air****t, so first flight will be from asphalt. May use the main
runway if I have no guts that day!
I read the specs too, but the thing just seems huge when compared to
the 40/60 size I have flown in the past. BTW, I just finished
installing the functional wing struts today. AL fittings at the fuze
into 1/4 ply, and thru bolted to a main spar, Used faired AL tubing
from Tower, flattened a tad at the ends. Attachment fittings slide
into the tubes with a pin to lock. Look clean and light, and seem
quite strong for tension.
If summer ever gets here, it will be a next season plane, but 12
inches of snow yesterday makes me wonder about that Global Warming
thing.
Rich.....
|
