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Initial Poor Rocket Performance

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kevin(at)bondedcomponents
Guest

Posted: Mon Jul 23, 2007 6:23 am Post subject: Initial Poor Rocket Performance

Hi Guys,



As you know (if you've read here a while) my father has a HRII, the 

first and only in the UK, a 10yr labour of love and its almost through 

its 10 flight pre-test flight envelope, which is good.



However so far the performance is quite hitting the right 

marks....Initialy thinngs looked great, with the first flight getting 

180-200mph off half throttle....However opening her up has only yielded 

220-230mph, which from what i gather is somewhat off the mark for full 

bore straight and level ??? RPM is a tocuh over 2500



The engine is an IO-540-D4A5, which was a new build by Norvick, there 

wasn't a stock C4B5 available and an extra 10hp can't hurt. The prop is 

a Hartzel HC-M2YR-1BF/F8475D-4. The governer is by Mccauley, i don't 

have the model no. to hand, but i don't know if this is the weak link.



Anyone use this engine/prop combination, if so whats you governer/set-up ?



Any ideas ???



Thanks,

              Lee

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sa300(at)uniserve.com
Guest

Posted: Mon Jul 23, 2007 7:19 am Post subject: Initial Poor Rocket Performance

It sounds like your governor needs setting up. It should go to 2700 rpm 

for max hp. 2500 is 200rpm too slow.



Lee Armstrong wrote:

 	  Quote: 	
		   

 <kevin(at)bondedcomponents.freeserve.co.uk>



 Hi Guys,



 As you know (if you've read here a while) my father has a HRII, the 

 first and only in the UK, a 10yr labour of love and its almost through 

 its 10 flight pre-test flight envelope, which is good.



 However so far the performance is quite hitting the right 

 marks....Initialy thinngs looked great, with the first flight getting 

 180-200mph off half throttle....However opening her up has only 

 yielded 220-230mph, which from what i gather is somewhat off the mark 

 for full bore straight and level ??? RPM is a tocuh over 2500



 The engine is an IO-540-D4A5, which was a new build by Norvick, there 

 wasn't a stock C4B5 available and an extra 10hp can't hurt. The prop 

 is a Hartzel HC-M2YR-1BF/F8475D-4. The governer is by Mccauley, i 

 don't have the model no. to hand, but i don't know if this is the weak 

 link.



 Anyone use this engine/prop combination, if so whats you 

 governer/set-up ?



 Any ideas ???



 Thanks,

              Lee



 __________ NOD32 2411 (20070721) Information __________

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mark936(at)webtv.net
Guest

Posted: Mon Jul 23, 2007 7:48 am Post subject: Initial Poor Rocket Performance

1/2 turn for 50 rpm.  is what I heard from Cliff Johnson  IIRC



we just increased ours last week.

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jrstone(at)insightbb.com
Guest

Posted: Mon Jul 23, 2007 8:23 am Post subject: Initial Poor Rocket Performance

Seems about right.  John Harmon's brochure claims 230 mph cruise.  I flew 

with him many years ago and that is exactly what we cruised at.  We are 

talking Indicated airspeed which as you know will decrease with altitude.

Jim Stone

98% done

Sept first flight

---

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