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wise(at)txc.net.au
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Posted: Sun Mar 21, 2010 9:17 pm Post subject: Emailing: PF Fly In 021.jpg

G'Day All,

  

 Have replaced original prop on our 18T with a GT  Propeller.

 First impression was the totally different shape  than the old V530 

 First flight onSaturday with new prop produced  shorter take off distance and a surprisingly better climb rate.  

 Pitch was set to produce 100% at full throttle and  on take off roll at full power went to 103%.

 Maybe need a very slight tweak on the  angles.

 This was with full tanks and 3 big  blokes.

 Yesterday, Sunday 21st went to fly-in come airshow.  30 min flight along the coast.

 Tailwind there and headwind home but appears to be  about 8 to 9 knots faster at the same settings.

 Oh, and by the way,  much smoother and a lot  less vibration.

  

 Very significant improvement during aero  display.

 1/2 tanks and 2 POB.

 Improved climb and aircraft hung in during  manoeuvres and rolls far better than original Russian prop.

 We had a height limitation of 1500 ft due to  controlled airspace and hence could not loop, but feel happy that the prop will  deliver the goods at aeros requiring higher power settings.

 Attached photo of inverted during roll  may demonstrate the attitude of increased performance in that the nose does  not seem to want to drop away as much as before.

 Rolls at 80/80.

  

 I have been looking at replacing the prop for about  a year and looked at Whirlwind, MT and  GT propellers.

 Have to say that at this stage I am very pleased  with the all round increase in performance.

  

 Cheers and regards,

 Chris.

  

  

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dsavarese0812(at)bellsout
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Posted: Mon Mar 22, 2010 8:22 am Post subject: Emailing: PF Fly In 021.jpg

If the blade angles are set to spec as provided by the  manufacturer, instead of playing with blade angles, why not simply adjust the  prop governor stop?

 Dennis

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cjpilot710(at)aol.com
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Posted: Mon Mar 22, 2010 7:43 pm Post subject: Emailing: PF Fly In 021.jpg

I believe the prop has to be set at a known angle.  Like at the flat pitch stop.  The angle is measured at the one meter point from the center of the hub and on the back or flat side of the blade.  The angle of the set, allows the blade to operate efficiently over the range of RPM.  Of course the both blades need to be the same angle.  The governor controls the RPM but does not pay attention to whatever the pitch is.  The pitch is what it is, depending on RPM setting and MP.   I think.  :>}

    

   Jim "Pappy" Goolsby

 

   

 

 

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radiopicture

Joined: 23 Jun 2008
Posts: 263

Posted: Mon Mar 22, 2010 8:07 pm Post subject: Emailing: PF Fly In 021.jpg

Right. GT suggests that you adjust the blade angle to give the proper static RPM at full power. According to them, it varies from engine to engine. I realize the stock blade angle is the same on all of them.



On Mar 22, 2010, at 11:42 PM, cjpilot710(at)aol.com (cjpilot710(at)aol.com) wrote:

[quote] 

 I believe the prop has to be set at a known angle.  Like at the flat pitch stop.  The angle is measured at the one meter point from the center of the hub and on the back or flat side of the blade.  The angle of the set, allows the blade to operate efficiently over the range of RPM.  Of course the both blades need to be the same angle.  The governor controls the RPM but does not pay attention to whatever the pitch is.  The pitch is what it is, depending on RPM setting and MP.   I think.  :>}

  

 Jim "Pappy" Goolsby

 

 

 

 

 --

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wise(at)txc.net.au
Guest

Posted: Mon Mar 22, 2010 9:25 pm Post subject: Emailing: PF Fly In 021.jpg

G'Day Jim and Dennis,

  

 Some of us have had the old props refurbished and  rebalanced here in Australia.

 We fly into some pretty dry areas at times that  have been rain starved for a while.

 Hence the blades have got a bit of a  bashing.

 We have always set the angle 1000mm from centre to  the V530 specs which from memory is 14.8 degrees??? Please do not hold me to  that.

 The GT specs are the same distance out at between 8  to 10 degrees.

 At 9 degrees on run-up % went over 100% and was  advised to slightly increase the blade angle.

 We have it at 11 degrees as we are achieving 100%  on takeoff roll with full power.

 I most certainly take on board your comments re the  job of the governor and will take this up with our LAME and prop  shop.

 I always learn good stuff from you guys and am  grateful for it.

  

 Cheers,

 Chris.

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dsavarese0812(at)bellsout
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Posted: Tue Mar 23, 2010 3:30 am Post subject: Emailing: PF Fly In 021.jpg

Always make sure when you set the blade angles that you do it  on the same side.  ie: set one blade angle then rotate the prop 180 degrees  to set the second blade angle.  Personally I always set them on the left  side as you face the prop.  You should also check to see of the blade  shanks have a scribe or whisker mark on them which are aligned with the center  mark on the sleeve under the counter weights.  Using the  scribed mark on the blades, the standard Russian blade was aligned to the  center mark on the sleeve to set the blade angles the same.

 Dennis

  

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dsavarese0812(at)bellsout
Guest

Posted: Tue Mar 23, 2010 3:43 am Post subject: Emailing: PF Fly In 021.jpg

I certainly understand changing the blade angle to achieve  100%.  But when the prop went slightly over 100%, it would have been a  whole lot easier to simply adjust the fine pitch stop on the prop governor  then to adjust the blade angles again.  The angle is close enough.  I  believe 14.5 degrees is the setting.

 Dennis

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