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John Heykoop
Joined: 10 Jan 2006
Posts: 15
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 Posted: Tue Sep 25, 2007 12:20 am Post subject: Woodcomp scimitar blades (was Emailing: IMG_0410, IMG_0411) |
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In a message dated 23/09/2007 18:04:27 GMT Standard Time, carl(at)flyers.freeserve.co.uk writes:
| Quote: | Hi Bob,
I noticed your ac is fitted with the Woodcomp Scimitar blades.
What prompted your choice (presumably over the Airmaster) and how are you
finding it. Is there any noticeable improvement in performance.
Are you using the Woodcomp or the Smart cotroller.
We are currently looking to fit a replacement prop and the scimitar blade is
something of a rarity amongst Europas. In fact William Mills was the only
other one I was aware of.
Carl Pattinson
G_LABS
PS: any problem with the PFA approving the installation.
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Carl & others interested in Woodcomp Scimitar blades for the monowheel Europa
I too was briefly interested in the Woodcomp propeller with scimitar blades, but have now bought an Airmaster propeller. In the UK the 65" (1650mm) diameter of the Woodcomp scimitar blades is an issue, the normal maximum for the monowheel Europa being 64" (1625mm). William Mills had scimitar blades fitted to his mono, but according to the PFA his propeller was only 63" . I suppose William's propeller must have been an early prototype.
The PFA will only allow you to fit a propeller of more than 64" diameter if you can show compliance with CS-VLA925. In order to do that you will have to demonstrate that the ground clearance from the propeller tip, with the aircraft fully loaded, in a level attitude and with a flat tyre, is at least 230mm. You don't actually have to deflate the tyre, for you can simply subtract the distance from the rim to the ground from your ground clearance measurement.
If you think the scimitar blades are worth all this hassle it would be prudent to make sure that you are going to get at least 230mm ground clearance before you place an order. That means doing the measurements twice, once before you order the propeller, and the second time once you have the scimitar blades fitted.
You can, of course, buy the Woodcomp propeller with standard blades. If you go this route, get one with the Smart Avionics controller. Woodcomp know how to make good propellers, but their controller has a poor reputation.
Hope this helps
John
Europa XS monowheel G-JHKP (Rotax 912S + Airmaster CS, 2200 build hours todate - hopefully I will be flying next summer)
[quote][b]
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M.Grass(at)comcast.net
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| Posted: Tue Sep 25, 2007 12:37 am Post subject: Woodcomp scimitar blades (was Emailing: IMG_0410, IMG_0411) |
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Hi John, all,
Did you ask Woodcomp for the prop in 1625mm? I ordered my Woodcomp Prop with Scimitar blades about a year ago with 1625 mm and got what I have ordered.
Regards
Michael Grass
A266 Trigear, 914, Wooodcomp SR3000
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John Heykoop
Joined: 10 Jan 2006
Posts: 15
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| Posted: Tue Sep 25, 2007 2:20 am Post subject: Woodcomp scimitar blades (was Emailing: IMG_0410, IMG_0411) |
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In a message dated 25/09/2007 09:38:19 GMT Standard Time, M.Grass(at)comcast.net writes:
| Quote: | Hi John, all,
Did you ask Woodcomp for the prop in 1625mm? I ordered my Woodcomp Prop with Scimitar blades about a year ago with 1625 mm and got what I have ordered.
Regards
Michael Grass
A266 Trigear, 914, Wooodcomp SR3000
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Hi Michael, all
No I did not. Their UK agent said that the prop could only be supplied in 1650mm diameter. Shows you how wrong he was. And teaches me not to rely on agents.
Regards
John
[quote][b]
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Mark Burton
Joined: 10 Jan 2006
Posts: 74
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| Posted: Tue Sep 25, 2007 3:14 am Post subject: Re: Woodcomp scimitar blades (was Emailing: IMG_0410, IMG_04 |
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G-NEAT is fitted with a scimitar bladed SR3000. The documentation supplied by Woodcomp states the diameter to be 1625mm (aka 64").
Mark
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Carl Pattinson
Joined: 26 Sep 2007
Posts: 11
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| Posted: Fri Sep 28, 2007 7:23 am Post subject: Re: Woodcomp scimitar blades (was Emailing: IMG_0410, IMG_04 |
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John,
Having tracked down the VLA specs I had a look at what it had to say about prop clearances. Unless I am very much mistaken I dont beleive the tyre should be deflated to achieve the 230mm clearance.
Here is the actual wording
"(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" .
Having said this my understanding is that most Classic Europas would fail the VLA test even with the 1575 blade fitted (ie: the Warp Drive). However the ruling is not retrospective so should not affect existing approved installatons.
Apparently the XS monos are not similarly affected because the XS engine mount raises the propeller by about 1.5" (compared to the mono. Consequently the 1625mm prop can be approved.
None of which is any help to me - it seems the Woodcomp is a non starter.
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Les James
Joined: 12 Jan 2006
Posts: 1
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| Posted: Fri Sep 28, 2007 1:10 pm Post subject: Woodcomp scimitar blades (was Emailing: IMG_0410, IMG_0411) |
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davidjoyce(at)doctors.org
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| Posted: Mon Oct 01, 2007 1:47 am Post subject: Woodcomp scimitar blades (was Emailing: IMG_0410, IMG_0411) |
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John, You may be interested in the attached flight test data for William
Mills' comparison of his Woodcomp SR2000 and a SR3000. Regards, David Joyce
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SR_3000_and_SR_2000_Comparison.doc |
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John Heykoop
Joined: 10 Jan 2006
Posts: 15
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| Posted: Mon Oct 01, 2007 9:16 am Post subject: Woodcomp scimitar blades (was Emailing: IMG_0410, IMG_0411) |
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In a message dated 01/10/2007 10:48:44 GMT Standard Time, davidjoyce(at)doctors.org.uk writes:
| Quote: | John, You may be interested in the attached flight test data for William
Mills' comparison of his Woodcomp SR2000 and a SR3000. Regards, David Joyce
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Thanks David. I had seen these flight test data (I think they were attached to one of William's postings). The figures for the SR3000/3 look pretty good. However, as mentioned earlier, the 1650mm diameter issue caused me to buy an Airmaster propeller instead.
John
[quote][b]
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