Marcel, Somewhere in that article I said that the
calculations suggest that the high twist prop gave me the
equivalent of 7.5 horse power, if I remember rightly, (as
computed from CAFE calculations). Now the 914 is already
providing lots of horsepower whereas the 912 I would have
thought needs all the help it can get! It did in fact
produce modest improvements in climb rate and fuel flow as
well as the 4 kt increase in top speed, all showing that
the high twist blade is more efficient,, and the take off
distance was notas you say 'increased' but 'Not
perceptibly changed'. So it is fair enough to say that it
is too much hassle to change propeller type, but not to
say that it would not be any improvement. Regards, David
"zwakie" <mz@cariama.nl> wrote:
><mz@cariama.nl>
>
> Thanks David for the informative and well-written
>documentation that you sent to me directly. From it I
>learned that a high twist will not bring me significant
>improvements in terms of performance or fuel flow, and
>that it will have a slight negative impact on take-off
>performance.
>
> That leaves (only?) one benefit of a high-twist
>propellor for my ship: improved cooling. Since I already
>decided to fight my (small) cooling issues with an
>oil-water exchanger from Laminowa, I do not (yet) see the
>point of using a high-twist propellor on my airplane.
>
>
> frans@privatepilots.nl wrote:
>> ONLY if you are the first one in Europe to have that
>>specific aircraft type / engine / prop combination. If
>>someone (for example in the UK) has already a noise
>>certificate for that combination you can just copy the
>>noise certificate.
>
> That is true PROVIDED you can submit a detailled
>noise-measuring report to go along with the noise-cert.
>The Noise Certificate by itself will be insufficient to
>copy it (been there, done it when I moved my plane from
>the UK to Dutch register)
>
> Having read more about propellers over the weekend, I am
>now inclined to stick with Arplast PV50... (I wish it had
>some leading-edge protection, but that's another
>discussion)
>
>
> frans@privatepilots.nl wrote:
>> Maybe some day I will find myself in a situation where I
>>need help, and some fellow Europa flyer will help me
>>out...
>
> I hope you will never find yourselves in such a
>position, but give me a call if you do :)
>
>
> frans@privatepilots.nl wrote:
>> It is best to have someone experienced in this to take a
>>look at it, and determine whether this will be a
>>structural or cosmetic repair.
>
> My guess is it will be a cosmetic repair given the
>position where it pierced, but I definitely want want to
>make sure by asking an expert. Frans, do you know anyone,
>perhaps yourself?
>
>
> frans@privatepilots.nl wrote:
>> The landing gear frame is similar to the engine mount
>>frame. I would start by checking the geometry of the
>>propeller flange as described in the Europa manual. If
>>this is still ok then it is unlikely something has bent.
>
> Unlikely, but not impossible, right? At least, that's
>what I read from Bud's response ("Just a heads up,
>normally the gear frame gets bent and we have to look at
>the mounting of the frame to the fuselage also").
> Still, measuring the geometry seems like a sensible good
>first step... (I already pulled the procedure for this
>from the build manual)
>
>
> budyerly@msn.com wrote:
>> I'm putting together a bit of info at the shop here in
>>Florida and will email direct to you a FACTORY suggested
>>inspection sequence for the structures, what you should
>>look for in additional damage inspections, and once you
>>have the inspections complete will assist in a repair
>>method to include layup schedules and materials to make
>>it good as new.
>
> That would be really helpfull, thanks Bud!
>
>
> budyerly@msn.com wrote:
>> Removal of the engine, I am afraid, is mandatory to do a
>>proper inspection.
>
> Not the thing I would like to hear, but somehow I knew
>this to be the case. Certainly since I am not willing to
>cut corners...
>
>
> budyerly@msn.com wrote:
>> I'll send a questionnaire and request photos of you
>>soon.
>
> Sure, thanks!
>
> --------
> Marcel
> (Europa Classic Tri-Gear PH-MZW)
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=381388#381388
>
>
>
>
>
>
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