My two pennyworth for a ground-adjustable Warp Drive (parallel blade
type) in an XS Trigear with 912S. Pitch angles set to 21.4 degrees.
1. Conditions:
- 1150 lb weight
- QNH 1016
- Temp at ground level 5 deg C
- Test conducted at 3000 feet
2. Performance
- max static rpm: 4920
- max rpm in level flight: 5700
- cruise IAS vs RPM:
4800: 115kts
5000: 120
5200: 124
5400: 128
5500: 131
5700: 136
- time taken to climb from 3000' to 4000':
100kts: 65 sec
90kts: 65 sec
80kts: 65 sec
70kts: 55 sec
(these were all very approx as I used a wrist watch not a stop watch)
-takeoff distance and fuel consumption not measured but for anyone
able to share data please include this if you have it.
What blade pitch is anyone else using for ground adjustable Warp
Dirive props?
Safe flying.
Willie Harrison
G-BZNY
On 8 Feb 2007, at 21:24, Duncan & Ami McFadyean wrote:
> Brian,
> I'm sure that William Mills will give you chapter-and-verse.
> But can you publish here your performance figures (including fuel
> burn if available) plus geometry of prop (diameter and twist
> distribution).
>
> I have a number of figures collected over the years from details
> that have been published by others. I'll dig them out, but they
> don't relate specifically to variable pitch props.
>
> Duncan McF.
> ----- Original Message -----
> From: Brian and Pat Tarmar
> To: europa-list@matronics.com
> Sent: Thursday, February 08, 2007 8:09 PM
> Subject: Europa-List: Trigear 912s Performance Figures
>
> Having just completed the test flying programme for PFA approval
> with a Woodcomp "Varia" 1700mm mechanically adjustable VP propeller
> on my Trigear with Rotax 912S, I would be very interested to hear
> some performance figures for other types of VP and constant speed
> propellers (no bull**** please!), so that comparisons can be made.
> I have this prop on sale or return from the UK agent, so can go to
> another model if necessary. The Woodcomp "Varia" has 2 scimitar
> blades and is adjusted by means of a simple cable arrangement in
> the cockpit and weighs no more than the Warpdrive it replaces. So
> far we are very pleased with the smoothe and quiet operation, an
> increase of 10 knots in cruising speed and better take-off
> performance - but how does it match the more exotic beasts? I hope
> you can assist.
>
> Brian Tarmar G-OBJT Classic with 912S XS firewall forward
>
>
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