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Rotax 912 'thrust'?

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zsmith3rd(at)earthlink.ne
Guest

Posted: Mon May 22, 2006 7:43 am Post subject: Rotax 912 'thrust'?

List,



Has anybody tied a 912-powered craft to a spring scale to determine "thrust" at max RPM?

In digging through my extensive assortment of stuff brought home by a pack rat I found a 0-400 pound spring scale with hooks on both ends........weighs equally well vertical & horizontal.

Obviously there are variables but it might be interesting to know just how much "pull" exists during run-up.



Idle minds want to know,



Regards,



Zed/701/R912/90+%/do not archive

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randy(at)shadycreekoutlaw
Guest

Posted: Mon May 22, 2006 8:17 am Post subject: Rotax 912 'thrust'?

William Wynne did some thrust testing... I believe his tests included the 

912...I believe...  Check out: http://www.flycorvair.com



Thanks,



Randy

http://www.n344rb.com

---

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p.mulwitz(at)worldnet.att
Guest

Posted: Mon May 22, 2006 8:53 am Post subject: Rotax 912 'thrust'?

Hi Zed,



I don't have your answer regarding static thrust, but I do have a 

warning.  This can be a misleading piece of information.



Static thrust comes from a combination of engine torque (HP) and 

propeller pitch and length.  It is OK for looking at the condition of 

your engine, but it can kill you if you use it to maximize thrust for 

flight.  The problem is that the low pitch which works great when the 

plane is standing still will not generate any thrust at all after it 

reaches a relatively low speed.  This means you won't generate good 

flying speed even though you have reached a high static thrust.  The 

long pitch angle that works best in cruise flight will not work well 

in the static condition.



This test is similar to measuring the pulling strength in a car in 

first gear.  It has some value but will not tell you how fast your car will go.



Good luck,



Paul

XL wings

do not archive





 	  Quote: 	
		  Has anybody tied a 912-powered craft to a spring scale to determine 

"thrust" at max RPM?

In digging through my extensive assortment of stuff brought home by 

a pack rat I found a 0-400 pound spring scale with hooks on both 

ends........weighs equally well vertical & horizontal.

Obviously there are variables but it might be interesting to know 

just how much "pull" exists during run-up.



Idle minds want to know,



Regards,



Zed/701/R912/90+%/do not archive

- The Matronics Zenith-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:

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tshank(at)core.com
Guest

Posted: Tue May 23, 2006 6:16 pm Post subject: Rotax 912 'thrust'?

This won't tell you a lot about the 912 but I did use one of those 400 

lb weight your bear scales to check the thrust of my Suburu, 350 lbs at 

5000 RPM. That's not maximum horsepower, that's at 5500, but at my first 

cut for pitch.



Tim Shankland

Zed Smith wrote:



 	  Quote: 	
		  



List,



Has anybody tied a 912-powered craft to a spring scale to determine "thrust" at max RPM?

In digging through my extensive assortment of stuff brought home by a pack rat I found a 0-400 pound spring scale with hooks on both ends........weighs equally well vertical & horizontal.

Obviously there are variables but it might be interesting to know just how much "pull" exists during run-up.



Idle minds want to know,



Regards,



Zed/701/R912/90+%/do not archive

- The Matronics Zenith-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:

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