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General control line discussion => Open Forum => Topic started by: wwwarbird on June 04, 2019, 07:53:05 PM
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Well, I've finally finished the Don Hutchinson P-38, YIPPEE!!! ;D
Power is two bone stock OS.35FP's turning Tornado 10x6 3-blade props with Tru-Turn FAI spinners and Perfect 4oz wedge tanks. Finish is all Brodak except for the "Vermillion Red" overall color that came from Randolph. Final clear is Brodak "Crystal Clear". Wing is covered with Polyspan and the rest of the model was covered entirely with medium silkspan. Controls are one-off aluminum bellcranks built per the Hutchinson plans combined with Tom Morris leadout wire, C/F pushrods with titanium ends and ball links throughout. I haven't gotten it on the scale yet but will update with that info soon...
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More pics...
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Top-n-bottom...
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Ya done good Wayne!
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Looking good, Wayne
Pat
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Thanks guys,
Just two test flights so far, this past Saturday evening at the Polk City, IA Stunt/Carrier contest. Initial flights on 64' lines went really well with it tracking like it was on a rail. I was actually surprised that it wasn't a lot faster since I'm running .35's in place of the recommended .25's. I was sort of expecting to have a red rocket to work on slowing down a bit. I didn't get any lap times but launching it at 9300 rpm the speed was really comfortable. The rest of the world thought I was nuts for hanging the .35's on it but it felt really good cooking along out there with great power everywhere.
Flying upright the outboard tip was up just a bit, forgot to look at it inverted, dang. I'll have to check next time out but I think a simple flap adjustment should even things out there. I need to dial in some more elevator as it was fairly slow on the controls but it feels like it's all there just waiting to wake up. Overall everything shows great promise and after some minor tweaking I'm confident everything will fall into place, it doesn't need much. ;D
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Just two test flights so far, this past Saturday evening at the Polk City, IA Stunt/Carrier contest. Initial flights on 64" lines went really well with it tracking like it was on a rail. I was actually surprised that it wasn't a lot faster since I'm running .35's in place of the recommended .25's. I was sort of expecting to have a red rocket to work on slowing down a bit. I didn't get any lap times but launching it at 9300 rpm the speed was really comfortable. The rest of the world thought I was nuts for hanging the .35's on it but it felt really good cooking along out there with great power everywhere.
Flying upright the outboard tip was up just a bit, forgot to look at it inverted, dang. I'll have to check next time out but I think a simple flap adjustment should even things out there. I need to dial in some more elevator as it was fairly slow on the controls but it feels like it's all there just waiting to wake up. Overall everything shows great promise and after some minor tweaking I'm confident everything will fall into place, it doesn't need much. ;D
Slow pitch response , coupled with "tracking like it was on rails", sounds like a classic nose heavy condition. More elevator won't counter this. Place an ounce on the tail and try it again. I'll wager you will see significant improvement.
Gary
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Aren't the lines a little short? >:D
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Slow pitch response , coupled with "tracking like it was on rails", sounds like a classic nose heavy condition. More elevator won't counter this. Place an ounce on the tail and try it again. I'll wager you will see significant improvement.
Gary
Very possible Gary and something I do plan to be looking at. One note though is that it didn't have the slightest tendency to drop the nose once the engines quit, or pitch up, it just continued forward with a nice level and very controllable glide. FWIW the flap/elevator setting is currently 1:1 so I do feel like I can feed it more elevator, we'll see.
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Aren't the lines a little short? >:D
Maybe, but that's what I had on hand for the moment.
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Came out pretty darn good, Wayne. I'd love to fly it!
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Can't resist this comparison... ;D
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Awesome Wayne! Can't wait to see it fly …
Dennis
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Yep, @#$% hot .
(https://farm3.static.flickr.com/2609/3969430738_6f315479fb.jpg)
Dunno if the Tornado 10 x 4s , if youve got some , mightnt pan out . Sort of lower gear , locked in , with a few more revs .
The old OS 35S like them . Pulled my ten ton P-38 , on one , through a loop or two .
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You specified 64 INCH lines. Wow! LL~
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Flight video from Des Moines Contest with Keith Sandberg at the controls.
https://www.youtube.com/watch?v=oLgi9BN9eVk
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You specified 64 INCH lines. Wow! LL~
DOH! Good catch Larry, I suppose that's what Bill was getting at too, I meant 64 FOOT lines, thanks! H^^
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Flight video from Des Moines Contest with Keith Sandberg at the controls.
Thanks Jared! That was the second flight with Keith pulling just a few soft maneuvers.
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Not a lot to complain about there . ;) H^^
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It looked smooth and predictable. But it did look sluggish on pitch. Was this due to the pilot? This will often be the result of being nose heavy. It can also come from too small an elevator on a flapped plane.
Gary
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Really nice Wayne. Good job!
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Nice job. Always enjoy the sound of a twin. Any multi, really. And it has a stylized look to it, as well, with the bright color and markings.
Question: Have you given any thought to uniflow tanks? Wasn't able to observe the end of the flight on the video, but my experience is that this arrangement has less of a tendency to lean out near the end of the flight.
Peter
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Hi! That really looks nice. I've done a bit of browsing to see how to acquire one of these kits or even the plans but I've had no luck figuring out where or who to contact. There is a really neat build log for the Hutchinson kits over on the Stunt Works site but again I couldn't find any contact info. Can anyone help?
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Hello Jim-
Send me an e-mail and I can supply plans. There are 25 warbirds in the series, plans unlike any you usually see!
Don
dhutch2@yahoo.com
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Twins sound so cool!!
Outstanding effort, Wayne!
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Got it on the scale tonight, 84.5 ounces. Of note here is the fact that my scale reads actual weight, unlike some others on this forum. ;D
It's a little heavier than I'd hoped but it didn't seem to be a big problem on the initial flights. Kind of weird, my PBY came out at 84 ounces RTF too, the P-38 doesn't pull as hard as that one though. Whatever the case, it is what it is at this point.
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It looked smooth and predictable. But it did look sluggish on pitch. Was this due to the pilot? This will often be the result of being nose heavy. It can also come from too small an elevator on a flapped plane.
Gary
Gary,
The "smooth and predictable" was the pilot, the "sluggish on pitch" was the airplane, and that will get dealt with. Keep in mind this was only the second flight on an all new model, just getting a feel with a few big soft maneuvers, we weren't going for the Combat corners or contest day bottoms at this point. So far I'm considering it a success. ;D
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Question: Have you given any thought to uniflow tanks? Wasn't able to observe the end of the flight on the video, but my experience is that this arrangement has less of a tendency to lean out near the end of the flight.
Peter
Right now it's the Perfect standard wedge tanks on muffler pressure, a simple setup I've typically had good luck with. It seemed to work perfectly here too, and I'm a big "if it ain't broke don't fix it" guy, K.I.S.S. ;D
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As great as it looks on the ground, it should look even greater in the air. Hope to see it soon Wayne, well done.
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Hello Jim-
Send me an e-mail and I can supply plans. There are 25 warbirds in the series, plans unlike any you usually see!
Don
dhutch2@yahoo.com
Done! Thanks again!!
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That is one nice looking plane! I've got a set of the prints...been waiting to see one done and in the air...I'm now going to have to build one.
Norm
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A great pic of the maiden flight launch... ;D
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Are you flying, launching, or taking the picture?
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Looks great Wayne!!!
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Are you flying, launching, or taking the picture?
I'm the fat guy out there holding the handle. ;D
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Really nice job! Thanks for the pictures and update.
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That's a great photo of you and Keith, thank the photographer.
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That's a great photo of you and Keith, thank the photographer.
I agree, an excellent impromptu photo! I couldn't resist either, I just picked up an 8x10 print of it tonight to go on my shop wall. Having a few of these photos sprinkled around the shop helps for inspiration if I get bogged down during a build. I'm not sure, but I think Tom Sontag gets the credit for this one, thanks Tom! H^^