Frans
I was told by Andy Draper that I would have to demonstrate compliance with
CS-VLA925 if I wanted to fit a propeller with a diameter of more than 64" to
my Europa XS monowheel.
He said I would have to be able to demonstrate a minimum ground clearance of
230mm, with the aircraft fully loaded, in a level attitude and with a flat
tyre.
I chickened out at that point and bought an Airmaster CS propeller.
John Heykoop
G-JHKP
On Wed, Mar 25, 2009 at 5:00 PM, Frans Veldman <frans@paardnatuurlijk.nl>wrote:
> >
>
> David Joyce wrote:
> > I am slightly reluctant to restart this thread, but Woodcomp have just
> > sent me a list of comments and corrections to some of the statements
> > produced in the last two weeks:
>
> Thanks for your confirmation. It is very much similar to what I
> expected. Interesting to see that they came to the same conclusion: the
> only thing that could have caused it is a voltage applied to the third
> reverse ring.
>
> Something else, I'm hesistating between a 2-blade and 3-blade Woodcomp
> 3000/W prop.
> Main pro's of the 2-blade are the significant weight savings of about
> 4Kg's (8-9 lbs), and the better cruise parameters (faster). I know that
> the climb parameters are slightly less, but I try to optimize for
> cruising as I feel that a 914 with intercooler will probably climb fast
> enough anyway. For taking off from a short strip I have to land there
> first, so if the take-off length is less or equal to the required
> landing lenght it is fine by me.
> As most folks here are choosing for a 3-blade prop, I'm wondering why
> that is? Visiual appearance, or are there things I just didn't see?
> I know about this vibration thing, but have confidence that it can be
> largely tuned away with balancing the carbs and blades. Many commercial
> airplanes with Rotax 914's are flying with 2-blade props, so it is
> apparently acceptable to do so.
>
> How much ground clearance is recommended for a tri-gear operating on a
> grass strip?
>
> With a nose-wheel mod (thanks Karl!), I will get about 300mm clearance
> if I choose for a 1720mm (67.5") prop. I guess this is acceptable?
>
> --
> Frans Veldman
>
>
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