Europa-List Digest Archive

Fri 02/09/07


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 01:58 AM - Re: Trigear 912s Performance Figures (William Harrison)
     2. 02:22 PM - Re: Trigear 912s Performance Figures (Duncan & Ami McFadyean)
 
 
 


Message 1


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    Time: 01:58:37 AM PST US
    From: William Harrison <willie.harrison@tinyonline.co.uk>
    Subject: Re: 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 > > > I choose Polesoft Lockspam to fight spam, and you? > http://www.polesoft.com/refer.html > href="http://www.matronics.com/Navigator?Europa-List">http:// > www.matronhref="http://forums.matronics.com">http:// > forums.matronics.com > http://www.matronics.com/Navigator?Europa-List_- > ============================================================ _- > forums.matronics.com_- > =========================================================== >


    Message 2


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    Time: 02:22:16 PM PST US
    From: "Duncan & Ami McFadyean" <ami@mcfadyean.freeserve.co.uk>
    Subject: Re: Trigear 912s Performance Figures
    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 I choose Polesoft Lockspam to fight spam, and you? http://www.polesoft.com/refer.html href="http://www.matronics.com/Navigator?Europa-List">http://www.matron href="http://forums.matronics.com">http://forums.matronics.com - The Europa-List Email Forum class="Apple-converted-space"> --> http://www.matronics.com/Navigator?Europa-List - NEW MATRONICS WEB FORUMS - class="Apple-converted-space"> --> http://forums.matronics.com




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