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Fergus Kyle
Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada
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 Posted: Sun Sep 30, 2007 6:25 am Post subject: Woodcomp scimitar blades |
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" (a) Ground clearance. There must be a clearance of at least 180 mm (for
each aeroplane with nose wheel landing gear) or 230 mm (for each aeroplane with
tail wheel landing gear) between each propeller and the ground with the
landing gear statically deflected and in the level, normal take-off, or taxying
attitude, whichever is most critical. In addition, for each aeroplane with
conventional landing gear struts using fluid or mechanical means for absorbing
landing shocks, there must be positive clearance between the propeller and the
ground in the level take-off attitude with the critical tyre completely
deflated and the corresponding landing gear strut bottomed."
If my interpretation is right there have to be two checks made. You first
load the aircraft up to its maximum weight and the clearance has to be in
excess of 230mm, then you deflate the tyre and there should then be what they
describe as "positive clearance".
My question is:
In the mono, is there a conventional landing gear? - and if not, are there conventional landing gear struts? (pleural?)
Another query is:
Rather than 'bottom' the landing gear strut, could not one calculate the geometric height equivalent and ADD a length it to the non-'critical' strut, then take the clearance measurement and subtract the calculated height to acquire the figure?
It's all somewhat ethereal, what?
It also occurs that when the directional control of the machine is lost, most victims ding the prop. What then is the danger of dinging the prop for a different reason (Flat tire)? I can only suppose shrapnel to onlookers………
Cheers, Ferg [quote][b]
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Mark Burton
Joined: 10 Jan 2006
Posts: 74
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| Posted: Sun Sep 30, 2007 7:59 am Post subject: Re: Woodcomp scimitar blades |
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I have measured the diameter of my scimitar bladed SR3000 and it is 1645mm. My Woodcomp paperwork says 1625. Hmm.
So when Conrad says they are 1650mm, he's pretty much telling the truth.
As for the clearances that Ferg describes, it's fine - I measured them earlier in the year and it passes the test.
Mark
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carl(at)flyers.freeserve.
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| Posted: Sun Sep 30, 2007 9:52 am Post subject: Woodcomp scimitar blades |
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We measured our prop/ clearances today and it dosent make good reading.
Prop diameter 1575 mm (62") - standard ground adjustable Warp Drive tapered
blades.
Clearance from ground in level configuration (using door sills as
reference) - 185 mm (230 is the minimum for VLA approval.
Clearance from ground tailwheel on ground - 285 mm
As Andy Draper said, the PFA wont approve any propeller on a Classic Mono in
excess of 62" unless it can pass the VLA test - and it clearly can't. This
is in line with what Andy told me on Friday.
As to how William managed to get his prop past the PFA is a mystery.
According to them it was a 63" dia blade and therefore shouldnt have been
approved (as his was a Classic Mono also) . And if Conrad Beale is correct
about the sizing it is more likely to be 65".
It might be worth asking the PFA if they would accept an installation on the
basis that they had approved one previously but I suspect the answer will be
no.
The next question is whether or not they will approve and Airmaster on the
Classic - I know they are OK on the XS.
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carl(at)flyers.freeserve.
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| Posted: Sun Sep 30, 2007 9:57 am Post subject: Woodcomp scimitar blades |
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The bottoming of the landing gear strut is achieved by simply loading the Europa to its maximum permitted weight. This is effectively the same as "bottoming the landing gear strut".
[quote] ---
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Fergus Kyle
Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada
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| Posted: Sun Sep 30, 2007 10:43 am Post subject: Woodcomp scimitar blades |
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"The bottoming of the landing gear strut is achieved by simply loading the Europa to its maximum permitted weight. This is effectively the same as "bottoming the landing gear strut". "
Maybe, but I don't think so. Take that combination and thump it onto paved runway and I'll bet the landing gear strut finds a whole new "bottom" - and I'll bet that's to what the regulation refers...........
Ferg
Visit - www.EuropaOwners.org
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ami(at)mcfadyean.freeserv
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| Posted: Sun Sep 30, 2007 11:10 am Post subject: Woodcomp scimitar blades |
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Carl,
As I understand it, William more or less bullied Woodcomp in to making the
SR3000 and was the first to try it out. Therefore it is possible that they
made one to the diameter that he wanted.
Duncan McF
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