Help on Freya 60-70 setup [Archive]

baltagia@teilar.gr

Nov 07, 2005, 03:11 AM

Hello everyone,

I'm experiencing a strange (to me) problem. Here is my story :
Recently, I bought a Freya 60-70 and I built it following exactly the
instructions of the manual. Strangely enough, the final available pith
range is only about 12 degrees (-3 to +9) what ever setup I follow in
the links and servo arms.
I don't have much experience in heli constructions, but I suspect that
the source of the problem is the wrong setup of the main mast. The
bottom end of the main mast has two holes about 10mm apart,
perpedicular to each other. The manual says (page 16, step 8) that I
must use the first hole at 185 mm from the top end of the mast. It
seems to me that if I use the other hole (at 195 mm from the top), I
could get a wider pitch range. But in this case, the bottom end of main
mast will be level with the lower (third) bearing block while in
currect setup (using the 185mm hole) the main mast exceeds the third
bearing block by about 10mm.
If I change the recommended setup and use the 195 mm hole, may I end
with a dangerous situation ?

Thanks for any help

Mike

Steve R

Nov 07, 2005, 11:11 AM

Hi Mike,

I just finished my first Freya too. I'm getting a good 20 to 21 degrees of
collective movement. Honestly, I'm not sure which of those holes I'm using
on the bottom of the main rotor mast. I do know that if I look under the
main gear, but above the cooling shroud, the main mast is flush with the
bottom support bearing block, the one that's under the main drive gear. I
think I'm in the bottom holes on the mast but am not absolutely sure of
that.

Also, you've got a number of other spots on the setup that will effect your
collective range. One is the main collective lever, the long one that the
servo actually moves up and down. There are two holes on it. The inner
hole will give you more collective movement than the outer. Also, on the
Bell/Hiller mix arms (the two black arms that are mounted to the flybar and
take cyclic inputs directly off the swashplate and pass them on to the main
blade pitch arms), there are a couple of holes on either end of these arms.
For maximum collective movement, you'll want the ball link in the outer hole
under the main blade pitch arm and the inner hole on the end that takes
inputs directly from the swashplate. I've got the ball links mounted to the
outer holes on each end on my Freya. Another obvious point is, how long of
an arm are you using on the collective servo itself? The greater the
distance from the rotation axis of the servo to the output ball links, the
more collective movement you'll get.

Hope this makes sense. Good luck!

Fly Safe,
Steve R.

<baltagia@teilar.gr> wrote in message
news:1131350719.882015.236640@o13g2000cwo.googlegr oups.com...
> Hello everyone,
>
> I'm experiencing a strange (to me) problem. Here is my story :
> Recently, I bought a Freya 60-70 and I built it following exactly the
> instructions of the manual. Strangely enough, the final available pith
> range is only about 12 degrees (-3 to +9) what ever setup I follow in
> the links and servo arms.
> I don't have much experience in heli constructions, but I suspect that
> the source of the problem is the wrong setup of the main mast. The
> bottom end of the main mast has two holes about 10mm apart,
> perpedicular to each other. The manual says (page 16, step 8) that I
> must use the first hole at 185 mm from the top end of the mast. It
> seems to me that if I use the other hole (at 195 mm from the top), I
> could get a wider pitch range. But in this case, the bottom end of main
> mast will be level with the lower (third) bearing block while in
> currect setup (using the 185mm hole) the main mast exceeds the third
> bearing block by about 10mm.
> If I change the recommended setup and use the 195 mm hole, may I end
> with a dangerous situation ?
>
> Thanks for any help
>
> Mike
>