Sameer - is it really 1/32" motor ? With a 1/4 x 1/2 inch motor stick
you should have little trouble with rubber up to at least 1/8". It's
hard to believe that a 1/32" motor will bend a stick of that mass.
LeRoy Cordes
AMA 16974
Chicago, IL
In God We Trust
On Thu, 11 Jun 2009 19:53:07 -0000 "Sameer Tiwari"
<deevana_2001_at_yahoo.com> writes:
> Hi,
>
> Thanks LeRoy and Benjamin for the replies...
>
> After some more experiments over the last two days, I realized that
> even though the MS bows, its the prop holder which is bending way
> more.
> I am using the Ikara gray plastic prop assembly.
>
> I do the back off everytime to get the corrrect torque on my home
> made torque meter, but the plane still dives :-(
>
> The length of MS from prop to hook is 7 inches
> Rubber is Tan 2, 1/32 - about 16" long, brass ring attaches the
> rubber to prop.
> MS is 1/4" X 1/2" grain running lengthwise.
>
> Maybe I should make the MS with two sticks and pass the rubber in
> between?
>
> Thanks,
> Sameer
>
>
> --- In Indoor_Construction_at_yahoogroups.com, Benjamin Saks
> <bensaks_at_...> wrote:
> >
> > It would help to have some key information:
> >
> > Length of your motorstick from the prop hanger to the rear hook
> > The cross sectional area of rubber that you are flying on
> > The grain orientation of the balsa wood that you have built the
> motorstick
> > from
> > The cross sectional dimensions of the motor stick
> >
> > Keep the following in mind:
> >
> > The motor stick will bow when loaded with a fully wound motor. You
> should
> > expect this to happen and use it to your advantage.
> > You can build in some slight upthrust to counter-act the down
> thrust from
> > the bowing motorstick.
> > You can also use balsa to make a tension bracing for the top of
> the MS.
> > Balsa is strong in tension and does not stretch.
> >
> > With more information I think we can help you out.
> >
> >
> >
> > On Mon, Jun 8, 2009 at 12:25 PM, Sameer Tiwari
> <deevana_2001_at_...>wrote:
> >
> > >
> > >
> > > Hi folks,
> > >
> > > Having built several of the indoor models over the last year. I
> kept
> > > bumping into the issues of a the plane taking a nose dive,
> whenever I put
> > > turns in the rubber exceeding a 1000.
> > >
> > > I am sure the folks on this forum know what I am talking
> about...
> > >
> > > The fusestick warps/buckles under the stress and causes an
> unwanted
> > > upthrust from the prop, causing the plane to nose dive. Once you
> pick it up
> > > and let it run a few seconds, it will fly beautifully once again
> giving
> > > close to 2 mins of flight time.
> > >
> > > But, I want to stretch more to exceed 3mins, and stuck on the
> fusestick
> > > design, it has to be balsa - no boron/fiber/tubes etc.
> > >
> > > BTW, I did try a box design with two 1/32 X 1/2 for a pair of
> sides and
> > > 1/16 X 1/16 for the other, and it was equally weak as a solid
> 1/4 X 1/2.
> > >
> > > Any ideas?
> > > Thanks
> > >
> > >
> > >
> >
> >
> >
> > --
> > BEN SAKS
> > Project Designer
> > bsaks_at_...
> >
> > WET
> > 10817 Sherman Way
> > Sun Valley, CA 91352
> > T 818.769.6200
> > F 818.301.6111
> > www.wetdesign.com
> >
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>
LeRoy Cordes
AMA 16974
Chicago, IL
In God We Trust
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Received on Fri Jun 12 2009 - 11:45:02 CEST