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1/4 Scale F4U-1A Don Smith Plans Build

Old 09-01-2008, 06:52 PM
  #576  
Rocketman612
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

Barry,

If BOTH the wing and stab are at +2deg you will be fine. They both need to be the same. If the stab is more you will get the effect of down thrust.

When I built my TF 60 Corsair I ran simulations in RealFlight with the changes to wing and stab incidence as long as they were the same she few fine. The finished plane fly's great as well with on bad habits.

Pete
Old 09-01-2008, 07:48 PM
  #577  
rack
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

if your going to establish inc you should do it with the elvs in place ,lock them in place with clamps or hook up the servos
Old 09-01-2008, 07:53 PM
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rack
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

if your going to establish inc you should do it with the elvs in place ,lock them in place with clamps or hook up the servos
Old 09-01-2008, 08:50 PM
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rack
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

set your inc 0 deg to the wing if that is what the plan recomends, for datum ref your wing should be set at 0 and the stab at plus 1 deg,never neg that seems to be what you have now , you realy should have the wing on to do this right, get your wing sadel perfect first then set the stab to the wing square it up before glueing any thing use screws to hold the stab in placetill you have it perfect i lock the airplane to the bench with clamps and screws to hold it steadly in place, a slight change in the datum line dosnt mater it can be corected by the engs down thrust
Old 09-02-2008, 02:36 PM
  #580  
NCIS
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

I tried doing it with the elavators in place but kept getting different readings from them moving even when clamped. I am now using a triangular piece of balsa tack glued to the TE to simulate the same position that the TE of the elevator would be. But I'll try to do it your way again and see what happens. Also the picture is deceiving because if you look at the stab you get that illusion but the incidence meter tells the true story doesn't it? As far as the wing is concerned why do you suggest doing it first? I am not even close to being ready to set the wing. Plus if you remember I am going to make the center section stationary epoxied to the fuse and then fiberglassed together too. I am using the center line on the plan as a datum line for a basis to go from. I am also using 2 laser levels for accuracy. I guess my bigest question is if I do as Rocketman says and just attach it what will and how will that effect the wing? These are all genuine questions and need answers please!!!

Barry
Old 09-02-2008, 02:41 PM
  #581  
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

Barry,
Luke Zollner of Zollner models, alias Adonis alias, Dionysusbacchus did extensive research into this and determined per the real Corsairs that the wing should be 2 degrees positive with the stab to match. if you do a search on his Royal .60 Corsair thread you'll see the documentation and why it is that way. I may be remembering incorrectly but I don't believe I am.
check it out I think you'll be pleasantly surprised.

Mike Damiani
Old 09-02-2008, 04:04 PM
  #582  
rack
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

i wouldnt glue any thing until you asemble it , you realy nead to find away to lock in your elrvators even if it means tack glueing them in its much more acurate it takes alittle to corect the stab but alot to change the wing sadel , get the wing right first
Old 09-02-2008, 05:56 PM
  #583  
NCIS
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

Mike,

Do you happen to know about what page his thread may be on in this forum?

Thanks,

Barry
Old 09-02-2008, 06:12 PM
  #584  
rt3232
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build


Barry

Its in a thread called "Royal Corsair .60 Project" don't have a clue what page of the thread

Good hunting

Cheers Bob T
Old 09-02-2008, 06:58 PM
  #585  
Skaweee
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

Here ya go!

http://www.rcuniverse.com/forum/m_62.../tm.htm#627400
Old 09-03-2008, 08:24 AM
  #586  
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

Barry
here's a link to the corsair build, http://www.rcuniverse.com/forum/m_62..._1/key_/tm.htm
and I believe he made some input on this in teh 1/8 topflite corsair mods thread also.
Old 09-03-2008, 05:55 PM
  #587  
NCIS
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

Thanks to all of you. Now I just need to find where he is relating to the stab and wing incidence. At least it's only 28 pages to read so I'll get started. In the mean time I did as rack suggested and clamped the elevators in their neutral spot and the reading came out the same as my triangular stock method that was suggested by rt3232. I am sticking with the +2 degrees and will hold off gluing the stab and fin in place until I read all of Luke's thread.

Luke,

If you are out there speak up please with some positive feedback about the +2 degrees incidence for the wing and stab that Rocketman612 told me was in your thread. It would save me a bunch of reading.

Thanks,

Barry
Old 09-03-2008, 06:40 PM
  #588  
rack
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

well im back on the corsair , got the gear mounted, still waiting for the leg exstensions and wheals
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Old 09-03-2008, 06:55 PM
  #589  
rack
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

your going to confuse your self, you are using a datum line set by don smith, zirole may use a diferent one and royal sumething else, but the main thing is that the stab is set at 0 degs to the wing, or in your case wing 2 degs and the stab two degs wich would leave the eng at 0 giving the eng a true 2 degs down thrust, my airplane is set at 0-0 with the eng set at 1-1/2 down.
just set your stab level to the wing and it will be perfect.
Old 09-03-2008, 07:20 PM
  #590  
NCIS
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

Heres a picture of the stab with the elevators clamped on to recheck the incidence. Also a picture of my last try at getting the headrest area behind the pilot the right height. It's now where I think it is supposed to be so I am not going to let my perfectionistic behavior get the better of me and re-do it again. This makes 5 tries on a simple modification. Maybe one of the gas cap I made if this darn computor ever downloads it. By the way what is the best filler that anyone can recommend? I am using elmers wood filler now mixed with a little water to get it to go on smooth.

Gibbs
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Old 09-03-2008, 07:47 PM
  #591  
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

for over wood get drywall compound the yellow tint system three, if you are going to aply it over large areas seal the wood with 50-50 epoxy to alcohal then when you glass it you do the same thing one thined coat of epoxy to set it ,
Old 09-03-2008, 07:52 PM
  #592  
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

One Comment luke always made, was about the somewhat tail high flight attitude of the F4U's If you want to PM him Barry His Handle is Adonis

Your bird looks great!

Mike
Old 09-03-2008, 07:58 PM
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

Found It!!!!

It was Corsair Jock's thread where I first read it and I know Luke confirmed it
Here's a cut and paste from the thread

"RocketMan: Thanks so much for the help.
What RocketMan is doing is making yet another 'adjustment' to make his Corsair more scale accurate: full scale Corsairs have 2 deg pos. incidence at the wing roots, stab is 1 1/4 deg pos"

Old 09-03-2008, 08:01 PM
  #594  
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

..
Old 09-03-2008, 08:02 PM
  #595  
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

removed already found no need to re post
Old 09-04-2008, 12:35 PM
  #596  
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

got my eng nead to build a corsair around one of these
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Old 09-04-2008, 12:40 PM
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

Sweet Rack!

err, I mean Sweet!, Rack...

What size is it, where'd you get it and how much did it cost?

Get cracking!

Goose
Old 09-04-2008, 12:44 PM
  #598  
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

yea, what V goose said!
Old 09-04-2008, 03:33 PM
  #599  
rack
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

its a 400cc moki i got it from rcshowcase 6,600 with prop
Old 09-05-2008, 12:34 AM
  #600  
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Default RE: 1/4 Scale F4U-1A Don Smith Plans Build

Here is a thread about the incidence they talked about.Good thing this came up ,I was looking for it awhile back but couldn't find it . thanks everyone ,Nice bird your building NCIS

http://www.rcuniverse.com/forum/m_79.../tm.htm#791263

thanks
Joe

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