Matronics Email Lists :: View topic - Trigear 912s Performance Figures

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Trigear 912s Performance Figures

Matronics Email Lists Forum Index -> Europa-List

View previous topic :: View next topic

Author Message

freefolk(at)screaming.net
Guest

Posted: Thu Feb 08, 2007 12:17 pm Post subject: 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   

  [quote][b]

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

ami(at)mcfadyean.freeserv
Guest

Posted: Thu Feb 08, 2007 1:39 pm Post subject: Trigear 912s Performance Figures

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.

 [quote]   ---

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

willie.harrison(at)tinyon
Guest

Posted: Fri Feb 09, 2007 1:58 am Post subject: 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:

[quote]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.

[quote]---

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

ami(at)mcfadyean.freeserv
Guest

Posted: Fri Feb 09, 2007 2:22 pm Post subject: 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.

 [quote]   ---

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

freefolk(at)screaming.net
Guest

Posted: Sat Feb 10, 2007 2:09 am Post subject: Trigear 912S Performance Figures

Willie

  

 Many thanks for your Warpdrive figures.  We  have never coarsened ours from the recommended Europa starting point of 19  degrees because the take-off performance from short grass strips was already, in  my view, not great.  At this pitch setting the max static was 5220 rpm and  max level flight speed 134 kias but with throttle retarded to maintain 5800  rpm. Our cruising speed at 4800 was 109-113kias, the better figures gained  when the c of g was rearwards with luggage (usually 2 folding bikes), and fuel  burn fairly solid at 15 litres per hour.  We did a series of climbs from  1000 to 2000 feet, in very similar conditions and weight to you and found that  best climbing speed for height was 80 kias (1 minute 2 seconds, as opposed to  1.05 at 75 kias and 1.13 at 70 kias).  Interestingly, neither the Warpdrive  or the Woodcomp Varia seem to "unload" from static, the Woodcomp giving us 5740  rpm throughout take-off and initial climb.  I will publish a full set of  figures once we have the mod approval and can play at length.

  

 Brian Tarmar  G-OBJT Classic Trigear XS  Firewall Forward 912S

 



I choose Polesoft Lockspam to fight spam, and  you?

http://www.polesoft.com/refer.html   

  [quote][b]

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

Display posts from previous:

	Matronics Email Lists Forum Index -> Europa-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum