Warbirds-Washout and Flaps  
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Warbirds-Washout and Flaps - 4/30/2002 10:11:49 PM   
Baldeagle


 

Posts: 1448
Joined: 2/2/2002
From: Lakeside, AZ, USA
Status: offline 		I am building a Dave Platt Zero ,The plans and instructions don't mention of any washout. What is your opinion , of washout with flaps. I am sure some washout will help,Is there a dissavantge? Thanks .

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Rich
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W&F - 4/30/2002 11:21:39 PM   
JGrc



Posts: 690
Joined: 2/24/2002
From: Pembroke Pines, FL, USA
Status: offline 		Rich:
In a nut shell: a bit of washout (2º or 3º) will make the wing more forgiving when is near the stall speed. Most full size aircraft have this feature but not all. It allows the tip of the wing to produce some lift when the root is not. I could not tell you about disadvantages.
Flaps will allow the wing to produce lift at slower speeds but also create a lot af drag beyond 25º.
JG

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Warbirds-Washout and Flaps - 4/30/2002 11:54:54 PM   
Chad Veich



Posts: 2808
Joined: 12/13/2001
From: Litchfield Park, AZ, USA
Status: offline 		Baldeagle, I'd check the plans real close or email Dave and find out for sure there is not some wash out in there already. The Platt Mustang and Spitfire have wash out I know. Regards, Chad.

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Warbirds-Washout and Flaps - 5/1/2002 12:31:36 AM   
Tmoth4



Posts: 1358
Joined: 3/14/2002
From: Brecksville, OH, USA
Status: offline 		I had a Royal Corsair that had no washout in the wings. It snapped into a death spin during a loop and was destroyed.
Several years later I built one from Brian Taylor plans that definitely has washout. It flies like it's on rails, even at slower speeds. Ever since then, I put washout in, even if the plans don't call for it, unless it's something like a biplane or trainer type.
I think washout is most important in wings that taper in chord and thickness.

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Warbirds-Washout and Flaps - 5/1/2002 2:53:31 AM   
Baldeagle


 

Posts: 1448
Joined: 2/2/2002
From: Lakeside, AZ, USA
Status: offline 		Chad I did get an email back from Dave Platt he said the Zero had no 0 washout. No reason was given. That still sounds a little strange. I just can't see why 1 or 2 degrees wouldn't help. Thanks for the input guys.

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Rich

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Warbirds-Washout and Flaps - 5/1/2002 2:57:54 AM   
Collinba


 

Posts: 20
Joined: 4/4/2002
From: Toronto, ON, CANADA
Status: offline 		Washout sure makes the landing a lot easier. A friend of my and myself built identical Pica 1/6 scale spitfires. He put the 2 degrees of washout in that the plans called for - I screwed up with jigging and ended up with 4 degrees of washout. Didn't do much for the scale looks (the extra washout was actually visible). Mine landed like a trainer - the stall was just a mushey nose droup - the stall on his was a violent snap. His was a handful to land. The high speed performance was no different.

Barry

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Warbirds-Washout and Flaps - 5/1/2002 5:56:55 AM   
Tmoth4



Posts: 1358
Joined: 3/14/2002
From: Brecksville, OH, USA
Status: offline 		Baldeagle,
If it was me, I'd gladly sacrifice a little scale appearance and put a couple degrees of washout in. It couldn't hurt and it just might save the plane.

JimS

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Warbirds-Washout and Flaps - 5/1/2002 7:07:51 AM   
Chad Veich



Posts: 2808
Joined: 12/13/2001
From: Litchfield Park, AZ, USA
Status: offline 		Baldeagle, can't say why Dave chose not to add washout to the Zero but it just may be a "scale" thing. If the full size did not have any Dave probably figured the model didn't need it either. He may be right, lots of Platt Zeros flying out there, but I just can't imagine a couple of degrees would do anything but make it better. Maybe try Yellow Aircraft and see if they put any in there Zero kit? Best of luck either way, Chad.

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Warbirds-Washout and Flaps - 5/1/2002 8:42:24 AM   
Baldeagle


 

Posts: 1448
Joined: 2/2/2002
From: Lakeside, AZ, USA
Status: offline 		Chad I think you hit the nail on the head. I had ask DP before about no down thrust and no side thrust. His answer was the real Zero didn't have any either. Thanks

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Rich

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Warbirds-Washout and Flaps - 5/1/2002 9:24:17 AM   
SCALECRAFT


 

Posts: 1408
Joined: 1/7/2002
From: MONTEBELLO, CA, USA
Status: offline 		I have built many WWII models mostly with hollow glass wings.
We always put in washout in the plug. Always works for us never against.

Also, around a year ago I asked Mr. Platt why the spinner he provides on the 109G was .25"smaller in diameter than the "scale" plan showed (correct size). He answered "just sand the fuse to match the spinner. I sent the spinner back to him. am turning my own to mold out of kevlar.

Draw your own conclusion.

Steve

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Warbirds-Washout and Flaps - 5/1/2002 11:20:43 AM   
fw190



Posts: 793
Joined: 1/1/2002
From: Burbank, CA,
Status: offline 		You want a forgiving warbird? then put washout, All of Zirolli warbirds have washout, I have 4 of his plans and they have at least 2 degrees. Taylor does the same and he uses washout, I think I have most of his plans.

In fact I have not really seen many Dave Platt warbirds, I can't remember the last time I saw one at the field??? maybe I am not looking. My Yellow P47 have washout, sorry I don't know about their Zero.

Too many great designers can't be wrong.. .

fw190

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No low and slow inverted - 5/1/2002 1:43:21 PM   
Leo



Posts: 324
Joined: 2/18/2002
From: Gothenburg, SWEDEN
Status: offline 		One disadvantage with wash out could be, when flying with negative G´s, the wing will actually have a wash in

Leo
Sweden

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Warbirds-Washout and Flaps - 5/1/2002 7:33:59 PM   
Baldeagle


 

Posts: 1448
Joined: 2/2/2002
From: Lakeside, AZ, USA
Status: offline 		You guys are something else. Where was this computer stuff 25 years ago. Ask and you will recieve. I have built close to 150 airplanes and I learn something every time. I new the reason for washout and what it did. You assume what the plans show is the best thing to do. I agree with Chad , I think it a 'Scale ' thing. Thanks again . Richard Church

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Rich

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Warbirds-Washout and Flaps - 5/1/2002 11:38:46 PM   
JL1


 

Posts: 446
Joined: 2/10/2002
From: Mason, MI, USA
Status: offline 		I don't know why Mr. platt does not include washout but I do know that his models build light for their size and fly very well. I have flown one of his 109's for years with no problem.
I think the fact that they have a realtively low wing loading may have a bearing on issue.

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