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Whirlwind Propeller blades

I really like this quote from wiki.. "The resulting design, the Yakovlev Yak-55, was a single-engined all-metal cantilever monoplane. The aircraft's wing is mounted midway up the fuselage and is of thick, symmetrical section to aid inverted flight"
SHIPCHIEF
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Joined: Mon Sep 26, 2016 5:37 pm

Whirlwind Propeller blades

Post by SHIPCHIEF » Sun Nov 12, 2017 12:46 am

I'm upgrading the Yak-55m steadily. So far; with LiFePO4 batteries, B&C lightweight alternator, removed cooling gills, removed Russian Tachometer & generator, stripping out old wire etc. to reduce weight. Also adding wheel pants and gear leg intersect fairings to reduce drag.
This time it's 6 pounds reduced, and 'more' thrust, climb. speed. economy, (standard promises for any aircraft part, maybe even radios?).
I bought the Wirlwind W-530 composite propeller blades through M-14P Inc. The price is the same as buying direct from Whirlwind, but I rely on Jill @ M-14P for technical assistance because I do the work myself. She deserves some renumeration for giving me good advice.
When I went to Akro Camp June 2017 @ Ephrata WA, Peter H, one of the instructors advised me NOT to upgrade to a 3 blade prop, it's a disappointment on a Yak-55. The 3 blade choices are MT and Whirl Wind Aviation (different from Whirlwind who supplied my W-530 blades) prohibitively expensive. Additionally, the MT propeller on my son's Giles has been off for blade repair twice this year due to blade coating failure, and other low time MT props I have seen at aerobatic competition also suffer from coating failure. That's too much trouble for the "best" aerobatic prop.
I had balanced the original V-530 wood paddle blades using a DynaVibe balancer (see previous post) but the tip vortex off the paddle tips is still pretty rough. I decided to upgrade to the W-530 blades, hoping the scimitar tips with 4" more diameter would give smoother flight, better climb rate (which is already AWESOME!) and better cruise cross country to contests.
I quickly received the blades, shipped UPS. Today I put them on. Right now, all I can say is: the V-530 propeller system is AWESOME (I know, I used that term once already). This prop is intended to be worked on in the field, not sent back to a vendor's shop for secret voodoo. The blades simply screw out of the propeller pitch sleeve after slacking the pinch bolts on the counterweight arm. The pitch sleeve has a collet out board of the threaded area.The propeller blade root has a steel ferrule that is threaded, then the outboard part of the ferrule is a smooth cylinder for the collet to hold. You lightly grease the threads, and thread the blade in until it bottoms out, then back it off until the desired pitch is obtained. Then the counterweight pinch bolt is tightened to tighten the collet to the blade. Here follows M-14P's instructions:
http://m-14p.com/wp-content/uploads/201 ... S.wps_.pdf
The part about removing the dome does not explain the reason: which is to remove the spring tension pushing to full pitch. Then moving the couterweight arms is easily done to the low pitch stop. Finally the blades can be set to the correct pitch with a protractor.
Attachments
V-530 PROP BLADE INSTALLATION AND SETTING INSTRUCTIONS.pdf
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SHIPCHIEF
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Posts: 38
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Re: Whirlwind Propeller blades

Post by SHIPCHIEF » Sat Nov 25, 2017 5:24 pm

Scratch the last sentence of my previous post.
Today I removed the propeller pitch piston & dome, I don't see any spring in there. The spring force toward coarse pitch must come from the force of the counterweights. With the piston assembly removed, you can see the edges of the pitch blocks etc. Everything should have a thin coating of grease.
The pitch piston and cylinder dome are easily removed with no spring pre-load, but you will get an oil mess.
The cavity is a centrifugal trap for sediment floating around in the engine oil. This is so easily accessed I would recommend occasionally opening it to wipe out the crud, which will extend the life of the oil seal on the piston.
I made a pitch adjusting paddle, and discovered a way to use the pitch protractor tool in an easy to repeat manner.
So the Three Dollar Question??? What's it like.
I noticed upon starting the engine that the noise level is less. This appears to be reduced propeller noise, which I presume is the tip vortex.
This prop has a very wide cord near the cowl and tapers toward the tip, with 4" more span and the scimitar tip.
I also noticed the static RPM is higher at warm-up power settings. I'll have to think about that one. Comparing the fine pitch setting to the Russian V-530 blade is not really possible, as the W-530 uses a pitch tool that nests on the leading and trailing edges, while on the V-530 the protractor is set across the aft blade face.
I 'feel' the rate of climb is increased, climbing out from the airport. The local flight in rough air didn't give a chance for speed testing. Instead I did some Cuban eights, Imelmanns and Competition turns. I noticed higher airspeeds on down-lines, and heading into the pattern...we'll see over time. Especially during cross country flights to contests.
Mostly, the eyeball rattling tip vortex vibration is gone, which will make hour long trips much more comfortable.

SHIPCHIEF
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Re: Whirlwind Propeller blades

Post by SHIPCHIEF » Sat Nov 25, 2017 8:37 pm

Remove cotter pin, then nut. Lift off dome.
Slot visible on dome fits over lock key.
Image
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SHIPCHIEF
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Re: Whirlwind Propeller blades

Post by SHIPCHIEF » Sat Nov 25, 2017 8:43 pm

Cut off lock wire, remove screw, pull out lock key.
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SHIPCHIEF
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Re: Whirlwind Propeller blades

Post by SHIPCHIEF » Sat Nov 25, 2017 8:46 pm

Turn cylinder to disengage lugs and pull cylinder straight out.
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SHIPCHIEF
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Re: Whirlwind Propeller blades

Post by SHIPCHIEF » Sat Nov 25, 2017 8:48 pm

Remove the piston and cylinder over a bucket, oil will spill out.
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SHIPCHIEF
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Re: Whirlwind Propeller blades

Post by SHIPCHIEF » Sun Nov 26, 2017 12:02 am

The piston seal and cylinder wall must be clean, without defects. Notice the sludge buildup, deposited by centrifugal force. Clean this out with a soft paper shop towel, leave no lint.
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SHIPCHIEF
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Re: Whirlwind Propeller blades

Post by SHIPCHIEF » Sun Nov 26, 2017 12:05 am

This pinch bolt locks the counterweight and pitch sleeve together with the blade root, after the pitch is set.
IMG_20171125_100337.jpg
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SHIPCHIEF
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Re: Whirlwind Propeller blades

Post by SHIPCHIEF » Sun Nov 26, 2017 12:09 am

To set blade pitch when the propeller shaft is inclined, the angle must be known. These blades specify 17 degrees of pitch at the low pitch stop. 83.2-17=66.2 on the down sweeping blade
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SHIPCHIEF
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Re: Whirlwind Propeller blades

Post by SHIPCHIEF » Sun Nov 26, 2017 12:19 am

After unclamping the counterweight pinch bolts, the old propeller blades simply screw out. Inspect & clean the socket and lightly grease the threads. The new blades screw in until they bottom out, then back them out to the desired pitch. Use the pitch paddle and pitch gauge fixture with protractor (digital level). Make sure the couterweights are pulled fully forward to assure the pitch is firmly on the low pitch stop.
Then tighten the pinch bolt and recheck the pitch. When correct, rotate the propeller in the normal direction and set the other blade, making sure the final set is within 0.1 degrees of the other blade.
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