Decalage angle

HomeBuiltAirplanes.com

Help Support HomeBuiltAirplanes.com:

Eugene

Well-Known Member
HBA Supporter
Joined
May 26, 2017
Messages
1,191
Location
Merrill, Wisconsin, USA
In terms of outright top speed, the black marlin is the fastest fish in the ocean capable of accelerating to an unbelievable 129km/h (80mph)

Screen Shot 2019-10-05 at 12.03.28.png
 

Eugene

Well-Known Member
HBA Supporter
Joined
May 26, 2017
Messages
1,191
Location
Merrill, Wisconsin, USA
I don’t know, not concerned about it at this point. I wouldn't start this project if I was concern about paint. I’m sure something like sandpaper will work just fine. If I ever get to final configuration that I like, then I will paint the whole airplane. But for now, For at least the next 10 years you will see me flying to Oshkosh only with primer at best. Sorry, I just don’t have any another ideas.
 

Eugene

Well-Known Member
HBA Supporter
Joined
May 26, 2017
Messages
1,191
Location
Merrill, Wisconsin, USA
I’m assuming that’s a special laminar surface treatment. Is there a patent?

I knew that somebody would like that picture. I will need to spend a lot of time sanding and cutting, before this project will look like real thing. But general shape already here, so hard part is over.
 

Eugene

Well-Known Member
HBA Supporter
Joined
May 26, 2017
Messages
1,191
Location
Merrill, Wisconsin, USA
8F429254-DE9B-42B9-AC6E-250CE985231B.jpeg

I have this question in my head for some time about compensation for right rudder. Wondering if I can add 1/2 of symmetrical airfoil to my vertical stabilizer. Wondering if people do this instead of changing angle. This piece can be CNC made from foam with different thickness to try it out until correct one found. 1/2 of 6% or 8% airfoil can be used to start with.
 

Eugene

Well-Known Member
HBA Supporter
Joined
May 26, 2017
Messages
1,191
Location
Merrill, Wisconsin, USA
View attachment 89334

I have this question in my head for some time about compensation for right rudder. Wondering if I can add 1/2 of symmetrical airfoil to my vertical stabilizer. Wondering if people do this instead of changing angle. This piece can be CNC made from foam with different thickness to try it out until correct one found. 1/2 of 6% or 8% airfoil can be used to start with.

My answer arrived from Russia. I was told to make sure to install it on correct side of vertical stabilizer. Also left side can get 8% or 10% airfoil and right side 6%. Aerodynamically this will be better approach.
 

Eugene

Well-Known Member
HBA Supporter
Joined
May 26, 2017
Messages
1,191
Location
Merrill, Wisconsin, USA
This is what I did in two hours. Looks like if you have the right tool to do the job, you can do a lot of damage very fast. That tool is belt sender.
C5BBEB6A-58CA-4B20-A9CD-21E86DD81FC6.jpeg FD7C3F45-B041-472E-8702-0909E889D881.jpeg 298EC2D6-DB70-4D71-8487-8C44C24442E1.jpeg 5FF29BF6-9934-4B63-BB31-FDAC6C069A9E.jpeg 019CFB8A-4542-402C-8EF4-DCFFF3F79160.jpeg B7990B50-E7F0-45FA-A51B-1C721FFD606E.jpeg D92C3700-5A41-42E3-B6CF-56E55C59440E.jpeg
 

Eugene

Well-Known Member
HBA Supporter
Joined
May 26, 2017
Messages
1,191
Location
Merrill, Wisconsin, USA
A1185BE6-761F-4BE4-8B70-FDD27088D253_1_201_a.jpeg 217AC87B-988E-4263-AF46-D035DCAA1657_1_201_a.jpeg


Last week I was flying Champ again with our local instructor. This time I was paying extra attention to this airplane. And yes, at 80-85 MPH this 4412 wing is definitely level to horizon in level flight and 2 people (1200 lb).

Something I don't ever see on my Skyboy solo and more power with only 1000 lb. We talked about this many times before. Drag is my enemy. I know.

My question is different this time. I talked many times about same 4412 wing and 60" chord on Aeronca and Skyboy. But on Champ ribs spacing about 12-14", and on my Skyboy about 20-22".

Wondering if this has any aerodynamic effect at all, at speeds below 100 MPH? Thank you!
 

Eugene

Well-Known Member
HBA Supporter
Joined
May 26, 2017
Messages
1,191
Location
Merrill, Wisconsin, USA
Didn’t really have time to do anything, but keep thinking about correct way to make connection for my new piece with wheel pans.

A3BBB55D-FCC2-4A3B-9297-238F2B900776.jpeg DB4D85BF-0908-4803-BD9C-5B92BE2A4F5F.jpeg
 

Eugene

Well-Known Member
HBA Supporter
Joined
May 26, 2017
Messages
1,191
Location
Merrill, Wisconsin, USA
Made some progress today and found that working with left side was not as easy at all. Shaping right side was very easy and using your imagination you can get pretty creative. Working on the left side no more creativity possible, because you have to duplicate what you have on another side and stay symmetrical. Eventually I will make it happen, but it will take time.

49EB4535-B18F-48A5-B853-54B6A9E02947.jpeg
 
Top