Results 1 to 22 of 22

Thread: Whirlwind Prop Owners

  1. #1
    cgoldy's Avatar
    Join Date
    Apr 2009
    Location
    Mountain Creek NSW Australia
    Posts
    387
    Post Thanks / Like

    Whirlwind Prop Owners

    I fitted a whirlwind prop and am happy with the performance. But I have had problems with the balance ever since I installed it. GA200 with a carbon fibre spinner. Ballanced with the spinner mounted of course.

    It was difficult to balance in the beginning but we finally got it near on perfect. I can't remember the number. But in flight I thought it was a bit average. Then I noticed that sometimes it was ok and other times it was poor. It continued to get worse over a month. I then noticed that in the morning at first flight, it usually was not to bad. But if I parked the plane and then returned it would be shocking. To the degree that I abandoned a return trip one day to find a prop ballacer. It was not safe.

    Before we got a chance to rebalance it we noticed that the rear spinner bulkhead has quite a bit of flexion. It could be imagined that the spinner could get a wobble up in flight. I removed the spinner and bulkhead and it has been perfect ever since. No nead for a rebalance. Smooth as silk.

    I rang WW and received a less than enthusiastic response to the issue. So before I go any further I wondered if any one else has experienced this. WW says that I am the only one.

    Ideas- Heat radiated from the engine when parked affected the back plate? Heat from being parked outside in the sun affecting the backplate. Back plate not cured correctly? Back plate not pure carbon fibre? Need for front bulkhead like on the RV versions.

    Col Goldy
    Back Country O-375 wide body extended wing cub

  2. #2
    www.SkupTech.com mike mcs repair's Avatar
    Join Date
    Aug 2004
    Location
    chugiak AK
    Posts
    9,359
    Post Thanks / Like
    broken/cracked/weak valve spring or sticking valve....... especially on an intake valve... will come and go

  3. #3
    Aktahoe Aktahoe's Avatar
    Join Date
    Sep 2010
    Location
    Truckee, Alaska
    Posts
    236
    Post Thanks / Like
    About to install a WW GA myself but have heard about vibrations from several. More than 3 or 4 let's just say that. Part of me thinks it may be easier to just switch my cruise Catto for a stump pulling Catto. Will see. Need to go test it out for myself. Long story short your not the only one dealing with the vibration issue and I guarantee it's not the first they have heard about it.

    akt

  4. #4

    Join Date
    Apr 2009
    Location
    AK
    Posts
    74
    Post Thanks / Like
    Very interesting- just installed a prop and spinner as described in the first post, and I did notice that the spinner had a lot of flex in the backplate and thought to myself “it sure could use a fwd bulkhead...”. Will be on the lookout for vibration- not sure if it’s flown yet or not...
    Likes mike mcs repair liked this post

  5. #5
    skywagon8a's Avatar
    Join Date
    Mar 2008
    Location
    SE Mass
    Posts
    8,133
    Post Thanks / Like
    Any chance that the spinner backing plate is not locking on the extended drive lugs?

    N1PA

  6. #6
    cgoldy's Avatar
    Join Date
    Apr 2009
    Location
    Mountain Creek NSW Australia
    Posts
    387
    Post Thanks / Like
    I have done 11 hours since taking off the spinner and it is now perfect. Spinner was installed as per the instructions. It was just not stiff enough. I was just interested to find out if they were correct in telling me that I was the only one having the issue. Mate of mine who should know looked at it and thinks it not entirely carbon fibre. The backing plate not the spinner.
    Back Country O-375 wide body extended wing cub
    Likes mike mcs repair liked this post

  7. #7
    Tony flyrite's Avatar
    Join Date
    Mar 2013
    Location
    Lyons,GA
    Posts
    178
    Post Thanks / Like
    Quote Originally Posted by cgoldy View Post
    I have done 11 hours since taking off the spinner and it is now perfect. Spinner was installed as per the instructions. It was just not stiff enough. I was just interested to find out if they were correct in telling me that I was the only one having the issue. Mate of mine who should know looked at it and thinks it not entirely carbon fibre. The backing plate not the spinner.
    Can't speak to the issue with the spinner , But, I can tell you that Balancemasters makes a great product that dynamically balances thru the rpm range ,from idle to tached out!
    Have two , one on my acro mount that regularly sees 3300 rpm on a pumped 0360 as well as on my C-90 .
    no relation to the company , but have several friends that are just as pleased as I am with the results.
    Most products advertising to accomplish what they can are in my experience...snake oil promising...this is one of the few that delivers what's advertised.
    You can also take it from plane to plane , if the engines have the same flange
    Likes mike mcs repair liked this post

  8. #8
    gdafoe's Avatar
    Join Date
    Feb 2002
    Location
    Castle Well Airpark SE of Wickenburg AZ
    Posts
    822
    Post Thanks / Like
    My spinner backplate has a lot of flex as well. I have talked to them a couple times and they seem to think it is not an issue. I think it needs a forward stabilizer as well just like their other spinners use. I am still flying it but may have to remove it. The propeller performance is spectacular.
    Gerald
    Likes mike mcs repair liked this post

  9. #9
    skywagon8a's Avatar
    Join Date
    Mar 2008
    Location
    SE Mass
    Posts
    8,133
    Post Thanks / Like
    Quote Originally Posted by cgoldy View Post
    Spinner was installed as per the instructions. It was just not stiff enough. The backing plate not the spinner.
    Quote Originally Posted by gdafoe View Post
    My spinner backplate has a lot of flex as well.
    Have you considered adding some layers of materiel to stiffen the backing plate? Or some other method of stiffening the backing plate? Adding a support ahead of the prop to stabilize the spinner?
    N1PA
    Thanks cgoldy thanked for this post

  10. #10
    gdafoe's Avatar
    Join Date
    Feb 2002
    Location
    Castle Well Airpark SE of Wickenburg AZ
    Posts
    822
    Post Thanks / Like
    I have wondered about making a .050/.060 aluminum backplate doubler but have not tried it.
    Gerald

  11. #11
    skywagon8a's Avatar
    Join Date
    Mar 2008
    Location
    SE Mass
    Posts
    8,133
    Post Thanks / Like
    If you do, bond it to the backing plate for improved stiffness. Without the bonding there could be some small amount of motion between the two parts thus reducing the potential improvement. Your idea has merit and should not effect the balance.
    N1PA

  12. #12
    cgoldy's Avatar
    Join Date
    Apr 2009
    Location
    Mountain Creek NSW Australia
    Posts
    387
    Post Thanks / Like
    Yes we could do this Pete but I thought that maybe WW could look into it. I must admit, I was surprised when they told me I was the only one with this problem. With the stories from others it will give me confidence when I call them to discuss the options. We did pay good money for what I thought would have been a tested product. And as Gdafoe says, no complaints with the prop.
    Last edited by cgoldy; 05-08-2018 at 03:55 PM.
    Back Country O-375 wide body extended wing cub
    Likes mike mcs repair liked this post

  13. #13
    gdafoe's Avatar
    Join Date
    Feb 2002
    Location
    Castle Well Airpark SE of Wickenburg AZ
    Posts
    822
    Post Thanks / Like
    I did talk with them again and was taken seriously. Part of the problem when I talked to them last time may have been that the prop was just installed. The immediate issue was that the spinner was flexing enough that it was cutting into the blades. On their advise I kept opening up the clearance until it was not hitting anymore. Now today a few months later and warmer here in AZ it is hitting the blades again. So I need to open up that clearance more but where do you stop. If I try to push/pull on the spinner enough to touch the blades it takes a lot of force. I don't know how many pounds I'd guess 30 - 50 lbs. I have always been able to feel some out of balance but it is not "normal" out of balance feeling. It comes and goes or changes as you are running it. So it appears that with the hotter wx the backplate is flexing more, which if it is marginal, to begin with, makes sense.
    Gerald
    Likes mike mcs repair liked this post

  14. #14
    cgoldy's Avatar
    Join Date
    Apr 2009
    Location
    Mountain Creek NSW Australia
    Posts
    387
    Post Thanks / Like
    From my limited knowledge, the RV version has an additional forward bulkhead. Which probably means the front of the prop hub has some sort of mounting holes in it maybe. I wonder why they couldn't supply this hub for the cub owners with a forward bulkhead. I love flying behind a ballanced prop.

    By the way, I weighed the blades individually and they were spot on identical within a gram. And my adjustments are within 0.1 degrees.
    Back Country O-375 wide body extended wing cub

  15. #15
    skywagon8a's Avatar
    Join Date
    Mar 2008
    Location
    SE Mass
    Posts
    8,133
    Post Thanks / Like
    This is the spinner that they should have sent you.
    N1PA
    Likes mike mcs repair liked this post

  16. #16

    Join Date
    Oct 2012
    Posts
    3,536
    Post Thanks / Like
    Those of us with the CS Whirl Winds have bulkheads in the spinner that get closely fitted to the dome on the hub. The bulkhead makes the spinner installation very solid. To that end the two-plane RV spinner should support the fixed pitch spinner nicely. Better than a single backing plate, for sure.
    Likes mike mcs repair liked this post

  17. #17
    cgoldy's Avatar
    Join Date
    Apr 2009
    Location
    Mountain Creek NSW Australia
    Posts
    387
    Post Thanks / Like
    I just spoke to Patty and Jim at WW. Jim says to send in the backing plate and he will look at it. He says a forward bulkhead would take some tooling and time. But hinted that it may be possible. It would certainly be the best fix in my opinion. I am happy with their response and I'll have to be patient.
    Back Country O-375 wide body extended wing cub
    Likes skywagon8a, mike mcs repair liked this post

  18. #18
    www.SkupTech.com mike mcs repair's Avatar
    Join Date
    Aug 2004
    Location
    chugiak AK
    Posts
    9,359
    Post Thanks / Like
    Quote Originally Posted by cgoldy View Post
    I just spoke to Patty and Jim at WW. Jim says to send in the backing plate and he will look at it. He says a forward bulkhead would take some tooling and time. But hinted that it may be possible. It would certainly be the best fix in my opinion. I am happy with their response and I'll have to be patient.
    Would you need a full bulkhead? Maybe a couple tabs from mount bolts would be enough??

    Post a picture of your prop installed. Not familiar with them.

  19. #19
    gdafoe's Avatar
    Join Date
    Feb 2002
    Location
    Castle Well Airpark SE of Wickenburg AZ
    Posts
    822
    Post Thanks / Like
    I wanted to report in the spinner/backplate situation. When I talked to Jim last week he got right on it and fast, they made a new backplate the next day that is 50% stiffer, shipped it overnight to me. I put it on right away but didn't get a chance to fly it until yesterday it appears to have solved the problem. It is like 30% thicker. I plan to dynamically balance the prop in a few weeks but it is pretty close as it is now. So Col I think I got the first revised one because they could get it to me quickly, but I expect you'll be getting an updated one pretty soon as well. I expect it will solve your problem.
    Likes mike mcs repair, skywagon8a, stewartb liked this post

  20. #20
    cgoldy's Avatar
    Join Date
    Apr 2009
    Location
    Mountain Creek NSW Australia
    Posts
    387
    Post Thanks / Like
    Quote Originally Posted by gdafoe View Post
    I wanted to report in the spinner/backplate situation. When I talked to Jim last week he got right on it and fast, they made a new backplate the next day that is 50% stiffer, shipped it overnight to me. I put it on right away but didn't get a chance to fly it until yesterday it appears to have solved the problem. It is like 30% thicker. I plan to dynamically balance the prop in a few weeks but it is pretty close as it is now. So Col I think I got the first revised one because they could get it to me quickly, but I expect you'll be getting an updated one pretty soon as well. I expect it will solve your problem.
    Hi Gdafoe,

    How did the back plate work out? I haven't sent mine back yet, still sitting on the bench.

    Col Goldy
    Back Country O-375 wide body extended wing cub

  21. #21
    gdafoe's Avatar
    Join Date
    Feb 2002
    Location
    Castle Well Airpark SE of Wickenburg AZ
    Posts
    822
    Post Thanks / Like
    It solved the problem it seems. I am going to do a balance on it one of these days soon. The thicker back plate made the difference.
    Gerald

  22. #22
    Aktahoe Aktahoe's Avatar
    Join Date
    Sep 2010
    Location
    Truckee, Alaska
    Posts
    236
    Post Thanks / Like
    First flight on my WW ga today. Great temps. Speed was great. It's set now at 11.5 and a full 2700 rpm on 35's I could get 105mph. 2350 gave me 90mph here with the DA at around 9000'. With the options for various settings it seems really good. With the pitch set at 14 you can get 130mph at 2700. Found myself cruising around at 2400/2450 a lot more today with same fuel burn as the Catto at 2350. Trying to make sense of it all as its still new to me. I'm anxious to play at both ends of the spectrum more. The 86/36 Catto is a stump pulling machine. The hard left turning tendency from the Catto is incredible. Will be interesting to see if the WW can do that. That Catto pulls! So, we will be playing with the various pitch settings to see. As for this thead, the prop was very smooth. I have the stiff backing plate.

    AKT
    www.bigtirepilot.com
    Thanks Olibuilt thanked for this post

Similar Threads

  1. Whirlwind install - Are all Australians as dumb as me?
    By cgoldy in forum Experimental Cubs
    Replies: 8
    Last Post: 01-15-2018, 08:37 PM
  2. Whirlwind GA-200CN Prop
    By Mark Lund in forum Experimental Cubs
    Replies: 7
    Last Post: 04-15-2016, 10:20 PM
  3. Whirlwind Prop
    By AK Bush Flyer in forum Experimental Cubs
    Replies: 13
    Last Post: 11-21-2013, 06:01 PM
  4. Whirlwind prop
    By brown bear in forum Member to Member
    Replies: 1
    Last Post: 06-02-2011, 06:28 AM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •