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egp8111
Joined: 25 Mar 2010
Posts: 49
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 Posted: Sun Mar 10, 2013 7:16 am Post subject: Warp Drive Tapered Tips |
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My monowheel classic has been in a bit of a time warp for the last 12 years or so and is very "old school". It has the 912ul and the orginal Warp Drive propellor from 1996. The prop blades are the standard broad tip profile. Does anyone have any experience with the broad tips versus the tapered tips ? I'm just wondering if it would be worth the effort to have the blades tapered.
Thanks,
EG
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houlihan(at)blueyonder.co
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| Posted: Sun Mar 10, 2013 7:31 am Post subject: Warp Drive Tapered Tips |
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Re the standard broad tipped Warp drive prop blades , My understanding was that the "standard" warp drive prop for the 80hp 912ul was the narrow or tapered blades, the wide blades were for the 100hp 912uls .
What is your reasoning regarding changing the blades ? are you having problems
Tim
G-BZTH
On 10 March 2013 15:16, egp8111 <egp8111(at)aol.com (egp8111(at)aol.com)> wrote:
[quote] --> Europa-List message posted by: "egp8111" <egp8111(at)aol.com (egp8111(at)aol.com)>
My monowheel classic has been in a bit of a time warp for the last 12 years or so and is very "old school". It has the 912ul and the orginal Warp Drive propellor from 1996. The prop blades are the standard broad tip profile. Does anyone have any experience with the broad tips versus the tapered tips ? I'm just wondering if it would be worth the effort to have the blades tapered.
Thanks,
EG
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tennant
Joined: 19 Apr 2011
Posts: 121
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| Posted: Mon Mar 11, 2013 1:27 am Post subject: Re: Warp Drive Tapered Tips |
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I seem to remember that Thomas Scherer had a considerable performance increase when changing back from the wide blades to the tapered blades on the 80 hp 912.
It must be in the archive somewhere.
Best regards
Barry
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Barry Tennant
D-EHBT
At EDLM - Germany |
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tennant
Joined: 19 Apr 2011
Posts: 121
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| Posted: Mon Mar 11, 2013 12:15 pm Post subject: Re: Warp Drive Tapered Tips |
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Gentlemen,
A relay from Thomas:
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Dear Barry,
for some unexplainable reason, I cannot post to the forum. Albeit I often would like to share my experience.
Anyway, I am not sure whether I would subscribe still that converting from wider blades to the tapered ones does help much in performance.
It is a complex co-play between OAT, Altitude, prop-angle and engine performance. I think I did change when I still had a ground-adjustable hub and then it helped as the 912 is a quite weak engine when at high OAT and a heavy plane.
I am now flying non-tapered and illegally long (by Europa-standards) blades in the search for hi-altitude performance. Since I added the airbox which is fed by a NACA-Scoop with fresh and slightly pressurized air, my max indicated altitude flown in California was 18.200 feet. The RPM at take-off is however scaringly low even with minimum prop-angle. Only during the second half of the roll will I see more than 4.800 rpm !
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Barry
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Barry Tennant
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JonathanMilbank
Joined: 14 Apr 2012
Posts: 390
Location: Aberdeen area
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| Posted: Tue Mar 12, 2013 8:59 am Post subject: Re: Warp Drive Tapered Tips |
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Hello EG, It surprises me to learn that you have the wide-tipped prop blades. I am also the proud owner of a Classic with 912UL 80hp and fitted with tapered Warp Drive blades.
My aircraft first flew in July 1997 with a ground-adjustable prop hub, until 2001 when I fitted the brilliant Airmaster electric VP hub with the same tapered blades. The take-off and climb performance was greatly improved, which allowed me to upgrade to 1370 lbs mauw.
My understanding from Europa in those days was that performance would be worse with wide-tipped blades, unless I upgraded to the 100hp engine.
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budyerly(at)msn.com
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| Posted: Tue Mar 12, 2013 2:51 pm Post subject: Warp Drive Tapered Tips |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Putting on my Airmaster Dealer Hat:
The 912 80 HP is best suited with the narrow chord 64 inch WD in either the ground adjustable or the Airmaster AP332.
The Wide chord is necessary for the 912S and 914.
That said, if longer blades are used, the narrow chord blades are not really well suited to planes like the Kitfox with 912S, Fascination, or others which can take 67" and even longer blades. Fascinations with narrow chord blades are disappointed as the top end is not very good and the Kitfox suffers the same, but the wide chord blades seem fine, however the inertia of the prop is higher than is proper for the Rotax...
The AP332 is capable of taking the Bolly, but that hasn't been much better than the WD, at the shorter lengths just lighter. However, the longer prop lengths benefit by the decreased inertia on start and is fairly quiet for those long blade length aircraft...
The case for high speed in the Europa and the WD is interesting. Normally about 140-145 Knots is about the top for the 64 inch blades. If you cruise routinely at higher altitudes such as 15,000, the WD blades do not have sufficient twist for speeds much above that even with the 914.
Airmaster developed the AP420 two blade and AP430 three blade to accept other blades of wider bases and chords. I prefer the Whirlwind blades in the 430 but you can have many other blades such as the Sensenich (not really good at high speed but great at low speeds and long blade length) Bolly (Austrailian), Kiev (Russian), Whirlwind (US) and a few others.
At Sun n Fun I will approach Warp Drive to try to get them to allow me to mold a new higher twisted blade with a slightly different chord width at the base for the Europa fliers. They rejected me two years ago, but we will try again...
Regards,
Bud Yerly
[quote] ---
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egp8111
Joined: 25 Mar 2010
Posts: 49
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| Posted: Wed Mar 13, 2013 9:10 am Post subject: Re: Warp Drive Tapered Tips |
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Not sure how I ended up with the wide blades. I ordered everything per the folks in Lakeland when I was building the plane back in 1995-6. I was a early US builder so maybe the tapered blade part got missed in the language translation from english to american.(how can a piece of foam be "proud"and what the heck is a spanner) I contacted WD and they said just ship them the blades and they would install the Europa taper. I'm going to get some good performance numbers with the wide blade first for comparison. Should be interesting.
Anyone tried the ground adjustable Wirlwind blades ?
thanks,
EG
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