Re: F1D Prop Spars

From: Nick Aikman <nickaikman_at_hotmail.com>
Date: Sat, 12 May 2007 11:27:16 -0000

Hi all,

We don't put boron down prop spars any more as we've all joined 'the
sacred confaternity of controlled flarers'

Nick.

!--- In Indoor_Construction_at_yahoogroups.com, "Mark" <f1diddler@...>
wrote:
>
> --- In Indoor_Construction_at_yahoogroups.com, "ewmonda" <ewmonda@>
> wrote:
> >
> > My understanding is that the prop spars on good F1Ds flare
forward
> > significantly at launch under high torque. Is that correct?
>
> Sort of. I see it happening more along with high RPM, such as what
> you see with a fixed pitch at launch. A VP in high pitch won't
pull
> blades forward as much as a FP will. Doesn't seem to hurt either
> way. Probably more important is that both sides flex similarly .
>
> <<Is the forward flare something that is desired,>>
>
> Don't know how much is good, and where it turns bad. Probably more
> important is to keep track of your bench deflection/weight data
then
> go lighter or heavier next time depending on how it behaved. Seems
> with variable pitch, you can somewhat "fly around", or adjust to
> whatever flare the spar is giving you, maybe to advantage, but who
> knows what is causation or what is only correlation.
>
> <<or would these be better if they were
> > stronger so long as weight was not a factor?
>
> The Brits used to double boron their prop spars for F1d, but seems
> they don't anymore. (correct, Nick A?)
>
> >>or would these be better if they were
> > stronger so long as weight was not a factor?
>
> Can't think of any F1d component where weight is *not* a factor.
> (Well maybe the flyer's weight. <g>) Sometimes best to start off
> matching published weights, and see if that works for you.
> Mark F1diddler
>
Received on Sat May 12 2007 - 04:31:42 CEST