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  #11  
Old 02-05-2009, 05:13 PM
DeltaRomeo DeltaRomeo is offline
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Default Test has been done....

...by Larry Vetterman (before he did his cowl mod thingy). He emailed me that he has all the data on the two props and will write something up next week (or so).

b,
dr
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  #12  
Old 02-05-2009, 05:47 PM
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jthocker jthocker is offline
 
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Default

All right then, I guess Scott and I will just have to compare home brew beers then!
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  #13  
Old 02-05-2009, 06:56 PM
Bob Axsom Bob Axsom is offline
 
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Posts: 5,685
Default Hartzell 7496 is the most efficient

Hartzell 7496 is the most efficient of the blades available from Hartzell based on charts provided to me by Hartzell engineering but they may not be available anymore. This was the original configuration blended airfoil for the 360s in RVs. The "97" is supposed to be thicker and drops off more rapidly after the peak than the "96" but both are far superior to the old Hartzell 7666 blades. I intend to search for some new "96" blades when I replace my 72" 7666 blades. Since you are looking for a direct compare with the "97" blades this information probably doesn't mean much but my response is triggered by the comments on Robbie Attaway's change to his very fast RV-6. For that compare to have value you have to know which Hartzell blades he started with.

Bob Axsom
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  #14  
Old 02-06-2009, 10:20 AM
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Noah Noah is offline
 
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Location: Rhode Island
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Default

Quote:
Originally Posted by Bob Axsom View Post
Hartzell 7496 is the most efficient of the blades available from Hartzell based on charts provided to me by Hartzell engineering but they may not be available anymore. This was the original configuration blended airfoil for the 360s in RVs. The "97" is supposed to be thicker and drops off more rapidly after the peak than the "96" but both are far superior to the old Hartzell 7666 blades. I intend to search for some new "96" blades when I replace my 72" 7666 blades. Since you are looking for a direct compare with the "97" blades this information probably doesn't mean much but my response is triggered by the comments on Robbie Attaway's change to his very fast RV-6. For that compare to have value you have to know which Hartzell blades he started with.

Bob Axsom
Bob, care to post these charts? When you say "they may not be available anymore" - do you mean the charts or the blades?

Are you saying that you believe the 7496s are more efficient than the 7497s? Or was this statement made prior to the advent of the 7497s?
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  #15  
Old 02-06-2009, 10:27 AM
Bob Axsom Bob Axsom is offline
 
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Default I wish I could

I wish I could but the the conditions under which they were provided to me prohibit sharing them.

Bob Axsom
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  #16  
Old 02-06-2009, 10:44 AM
breister breister is offline
 
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Location: Atlanta, GA
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Default

This will be a terrific real-world comparison.

If I could make any suggestion, it would be this (presumes both aircraft have fuel flow readouts):

On the comparison runs, run several RPM/MP/FF combos to insure that speed for prop a/b is measured at consistent power. Plan these out before the runs and use a checklist (boring, but more scientific!).

Looking forward to the results!
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  #17  
Old 02-06-2009, 10:56 AM
Pilottonny Pilottonny is offline
 
Join Date: Jan 2006
Location: Belgium
Posts: 645
Default MT

The 2 blade MT ($ 7.700,- at Van's) has a TBO of 1.000 hrs or 6 years, but the overhaul costs EUR 1.850,- (approx. $ 2.400,-) and takes 4 weeks plus shipping time. Also there is an RPM limitation between 2.050 and 2.300 RPM. That is why I am now thinking of getting the Whirlwind. Whirlwind 200RV is 3 lb heaver than the MT though.

Regards, Tonny.
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ECI-Titan IOX-320 with dual EI, turning a Whirlwind 200RV CS prop.
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  #18  
Old 02-06-2009, 04:07 PM
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Gregmarlow Gregmarlow is offline
 
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Location: TN
Posts: 183
Default on an RV9A with IO-320?

According to the whirlwind website, the 200RV is for O360's and up. I'd be interested if it is appropriate to the 9A.
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  #19  
Old 02-06-2009, 05:09 PM
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Gregmarlow Gregmarlow is offline
 
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Location: TN
Posts: 183
Default mt prop govenor?

Also, can you definately not use the Van's supplied MT govenor with the whirlwind props? I'm thinking I like th 151 series for my 9A.
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  #20  
Old 02-07-2009, 03:14 AM
Pilottonny Pilottonny is offline
 
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Location: Belgium
Posts: 645
Default 200RV is good for O-320 and O-360

Greg,

I spoke to Greg at Whirwind, the 200RV is for the O-320 and O-360. No restructions on either engine, including FI and El. Ign. It works with the Van's MT governor.

The TBO is actually 650 hrs. or 5 years and can be done by a Mc. Cauley propeller shop (if they want to work on an experimental propeller ofcourse), because its hub is similar/the same.

The 3 bladed 151, has a TBO of 350 hrs or 5 years. It is a few knots slower but performs a bit better in climb (according to Whirwind!) This one needs the pressure setting to be much higher than the standard MT governor, but maybe the governor can handle it and just needs to be set at the higher pressure. Give Whirwind a call, they maybe able to advise on this.

I am still waiting for the shipping quote, that I requested through the American Propeller website. Did others get a quick response, or is it better to call them?

Regards, Tonny
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ECI-Titan IOX-320 with dual EI, turning a Whirlwind 200RV CS prop.
Sold
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