Today's Message Index:
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1. 01:43 AM - Re: trailer wing support profile. (Keith Hickling)
2. 11:33 AM - propeller optimization (Dwayne McAllister)
3. 12:26 PM - Re: propeller optimization (Jerry Rehn)
Message 1
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| Subject: | Re: trailer wing support profile. |
Many thanks Roddy,
I had considered this, but it's good to hear it worked well. I'll think
about which way to go.
Regards,
Keith.
----- Original Message -----
From: RoddyEuropa@aol.com
To: europa-list@matronics.com
Sent: Friday, May 25, 2007 8:14 AM
Subject: Re: Europa-List: trailer wing support profile.
In a message dated 22/05/2007 09:12:20 GMT Standard Time,
keithhickling@clear.net.nz writes:
Does anyone have a wing profile forward of the spar at the position
of the wing support on the factory trailer? On my drawing this is 2
metres from the root spar pin bush. If anyone has one they could email
or post to me I would be very grateful and it would save a lot of work
trying to transcribe it from the wing. I need it to get the trailer wing
supports made.
Keith Hickling,
New Zealand.
I have made trailer supports for the outboard part of the wing by
moulding directly over the finished wing - so you get a snug fit. What I
did was put the wing leading edge up, cover it in a polythene sheet,
then stretched some thick foam (a camping sleep mat) over the leading
edge, and then laid up several layers of glassfibre over that, about 10
inches wide, and about 16 inches back each side from the leading edge.
Once set, I removed it, trimmed it, cut it into two bits 5 inches wide,
and this then formed a perfectly shaped insert to go into the trailer U
shaped bracket. Then, put the wings on the trailer with the new inserts
loosley in place, and then glassed these into place on the trailer. So,
I ended up with a wing support that exactly matched the wing profile. I
have used it once, about 10 miles, and the signs are that it works far
better than the sling as supplied with the trailer.
Roddy Kesterton
europa 220
Message 2
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| Subject: | propeller optimization |
I spoke with a gent at Warp Drive who explained that with the short
blade's used on the europa, the blade pitch angle needed for higher
speeds can be greater than optimal causing turbulance near the tips.
He told me they can modify the blade near the tips to alleviate this
problem and pick up 5 or 10 kts. He also said it would be better for the
europa if one used the 912 gear ratio (2.27:1) rather than the 914(
2.43:1).
Has anyone tried the constantspeed blade planeform from Warp Drive? or
used the 912 gear ratio on the 914? if so was performance improved?
Dwayne McAllister
dmac11(at)telus.net
Message 3
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| Subject: | propeller optimization |
Dwayne
I would talk to the folks at Airmaster; they did extensive testing for their
prop using the Europa as the test platform! They seem like pretty smart
folks and worked with Warp Drive during the development. The Mono wheel may
have some blade length compromises due to the ground clearance but I don't
know. I don't think Rotax would recommend switching gears around between 912
and 914. I sure like my Airmaster, its worked great for 6 years.
Jerry
_____
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Dwayne
McAllister
Sent: Friday, May 25, 2007 11:32 AM
Subject: Europa-List: propeller optimization
I spoke with a gent at Warp Drive who explained that with the short blade's
used on the europa, the blade pitch angle needed for higher speeds can be
greater than optimal causing turbulance near the tips.
He told me they can modify the blade near the tips to alleviate this problem
and pick up 5 or 10 kts. He also said it would be better for the europa if
one used the 912 gear ratio (2.27:1) rather than the 914( 2.43:1).
Has anyone tried the constantspeed blade planeform from Warp Drive? or used
the 912 gear ratio on the 914? if so was performance improved?
Dwayne McAllister
dmac11(at)telus.net
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