I have virtually the same set up with 912S, wide chord WD at 21.5
degrees. But not trigear.
For about the same weight, climb figures are all virtually the same,
except best climb is just over 80kts and all of the speeds are about
12kts quicker. 5800rpm produces more than Vne (150).
Recent addition of cold air has increased the static rpm and climb, plus
knocked c10% of the fuel burn, surprisingly.
Duncan McF.
----- Original Message -----
From: William Harrison
To: europa-list@matronics.com
Sent: Friday, February 09, 2007 9:49 AM
Subject: Re: Europa-List: Trigear 912s Performance Figures
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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