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$50.00 Scratch Build Contest Entry, F-20 Tigershark

Old 09-17-2013, 11:34 AM
  #26  
CHELLIE
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heated and bent some more foam for the nose area, Its getting there


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Old 09-17-2013, 11:42 AM
  #27  
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Originally Posted by CHELLIE View Post
heated and bent some more foam for the nose area, Its getting there


Lookin good Chellie,what kind of foam is that?
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Old 09-17-2013, 11:56 AM
  #28  
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Chellie
Coming together nicely.
I know you are careful but a heat gun over an aerosol can!
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Old 09-17-2013, 01:00 PM
  #29  
CHELLIE
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Originally Posted by Crashalott View Post
Lookin good Chellie,what kind of foam is that?
Crash
Hi Crash its made by Great Planes, it works great
http://www.greatplanes.com/accys/gpmr7500.html

Originally Posted by quorneng View Post
Chellie
Coming together nicely.
I know you are careful but a heat gun over an aerosol can!
I check to make sure the can does not get hot, The Foam Insulates the can, I Hope
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Old 09-17-2013, 01:07 PM
  #30  
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got the nose formed Yea It Was a pain, but I think I won The fuselage is just sitting on top of the bottom part and tapped together for a fit, I have to get the front landing gear in the fuselage and brace it with some bass wood, dang the nose is long on this plane here are a few more pics, Take care and have fun, Chellie





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Old 09-20-2013, 06:33 PM
  #31  
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Looking good. Should be a good flyer.
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Old 09-20-2013, 08:39 PM
  #32  
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Originally Posted by pmullen503 View Post
Looking good. Should be a good flyer.
Thank You I need to get the front landing gear installed then i can finish the nose, its getting there Take care, Chellie
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Old 09-20-2013, 11:12 PM
  #33  
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That's lookin' really sharp, Chellie!
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Old 09-21-2013, 12:45 AM
  #34  
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Originally Posted by mclarkson View Post
That's lookin' really sharp, Chellie!
Thank you Ok, I got to get back to it
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Old 09-21-2013, 01:21 AM
  #35  
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Chellie
What will be removable to get at the battery etc?
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Old 09-21-2013, 06:16 PM
  #36  
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Originally Posted by quorneng View Post
Chellie
What will be removable to get at the battery etc?
Hi I will be making a canopy for it that will come off for battery Access, look at the bottom drawing, it will look something like that. I thought I had a 480 Motor around here, but i got to looking and could not find one, Soooooo I went to Heads up Rc web site and ordered a speed 10 motor 1600kv and a 8 X 6 apc prop that should get her moving on 3 cells

http://www.headsuphobby.com/Firepowe...otor-C-311.htm

The Firepower 10 Speed (3536-16) is a 3.7 oz, 1600KV, 500 watt, 480 class direct drive outrunner brushless motor designed for high speed models, and for models where prop size is limited to 8 or 9 inches. It is capable of producing up to 60 ounces of thrust using an APC 9 x 4.5E prop and a strong 3 cell Lipo battery.


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Old 09-21-2013, 06:35 PM
  #37  
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Wow! 500W, 60oz thrust??
That's 50(ish)A.
You would indeed need a 'strong' 3 cell!
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Old 09-23-2013, 11:56 PM
  #38  
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Nice subject for depron and also one of the best looking modern era jets.
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Old 09-24-2013, 12:37 AM
  #39  
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Originally Posted by Bill G View Post
Nice subject for depron and also one of the best looking modern era jets.
Hi Bill The F-20 Tigershark Has always been one of my Favorite Plane, its a sweet design, politics killed it, its was going neck to neck with the f-16 another one of my Favorite Planes too I Also like the F-5 and T-38 Too, I just got my motor in from Heads Up Rc, so Here i go again Building Take care, Chellie
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Old 09-24-2013, 05:53 AM
  #40  
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I got a little more done on the F-20 and my motor from Heads Up Rc Came in, Yea I added a 3/8" X 3/8" Basswood wing brace/spar and I used a wood Yard stick for a little extra support and for a steering Landing gear Mount, I epoxied a couple of pieces ply wood on the yard stick, drilled through it, and added the Steering gear, the front LG is a Piece of old Aileron Control wire I had Laying around, I had to add a piece of round dowel for a stop, because the control arm wanted to go over center, added a Rudder, epoxied the nose and fuselage shell to the bottom section of the jet, I Think I got most of the hard part done I have to make 2 Air Ducts on the side of the fuselage yet and cut the canopy to gain access into the jet, Its getting there Take care, Chellie



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Old 09-24-2013, 09:29 AM
  #41  
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I am trying to figure out how to make the side air scoops I tried to bend some 2mm depron, but that did not work out the 2mm depron is harder to bend than 6mm depron, because it just wants to crack like glass, I admire builders that can build with 2mm depron, for me, its a Pain to work with, Ok Attempt #1 Failed, attemp #2 I am going to make the top and bottom parts from 9mm depron and epoxy some 6mm depron on the side for a skin, that should allow me to sand a nice radius on the corners, i will tapper the 9mm depron on the inside edge so its 6mm at the front, so it looks like 6mm all around, and the 9mm gives me some surface to glue onto and sand, Maybe Just Maybe that will work been racking my brains out all day trying to figure something that will work, I was going to try to build up some foam and glue it together, but that might turn out to be to heavy, Ok, Here I go Again Take care, Chellie
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Old 09-24-2013, 10:06 AM
  #42  
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Looking good Chellie. As always, I'm in envy of a builders skills and their ability to build what they want instead of being at the mercy of the manufacturers.
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Old 09-24-2013, 10:16 AM
  #43  
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Originally Posted by xmech2k View Post
Looking good Chellie. As always, I'm in envy of a builders skills and their ability to build what they want instead of being at the mercy of the manufacturers.
Thank you sometimes I run into problems that take a day or 2 to figure out but I just keep trying something and eventually I win I am Just Stubborn, I dont give up Easily, I will bang my head on the wall untill i get a good Idea LOL

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Old 09-24-2013, 12:25 PM
  #44  
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Originally Posted by CHELLIE View Post
I am trying to figure out how to make the side air scoops I tried to bend some 2mm depron, but that did not work out the 2mm depron is harder to bend than 6mm depron, because it just wants to crack like glass, I admire builders that can build with 2mm depron, for me, its a Pain to work with, Ok Attempt #1 Failed, attemp #2 I am going to make the top and bottom parts from 9mm depron and epoxy some 6mm depron on the side for a skin, that should allow me to sand a nice radius on the corners, i will tapper the 9mm depron on the inside edge so its 6mm at the front, so it looks like 6mm all around, and the 9mm gives me some surface to glue onto and sand, Maybe Just Maybe that will work been racking my brains out all day trying to figure something that will work, I was going to try to build up some foam and glue it together, but that might turn out to be to heavy, Ok, Here I go Again Take care, Chellie
Hi Chellie
Try DollarTree Foam...Take the paper off... Put packing tape on one side... and slowly work it to shape. Im not sure of how small a radius you are trying to get but im sure you can do it.
Crash
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Old 09-24-2013, 08:57 PM
  #45  
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Thank You Crash, Thats a good idea
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Old 09-24-2013, 09:10 PM
  #46  
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+1 on $Tree Foam. It's very soft and can be coaxed into about a 1" diameter tube. Roll the untaped side with a broom handle on a soft surface like a coach cushion. Make the piece oversized and roll with increasing pressure to get a smaller and smaller radius to the foam.

Try it for the intakes.

Looking good.
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Old 09-24-2013, 09:11 PM
  #47  
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For non-structural bits, you can even go with white poster board.
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Old 09-24-2013, 10:14 PM
  #48  
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Originally Posted by pmullen503 View Post
+1 on $Tree Foam. It's very soft and can be coaxed into about a 1" diameter tube. Roll the untaped side with a broom handle on a soft surface like a coach cushion. Make the piece oversized and roll with increasing pressure to get a smaller and smaller radius to the foam.

Try it for the intakes.

Looking good.
Thank You I will try that too if my 2nd attempt does not work

Originally Posted by mclarkson View Post
For non-structural bits, you can even go with white poster board.
Good Idea Too Thanks Everyone for the Ideas
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Old 09-25-2013, 10:10 AM
  #49  
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Chellie
As I am sure you are aware Depron (particularly the thin stuff) has a 'grain' and it bends nearly twice as well one way.
The trick I have found to bend thin Depron is to effectively 'crush' the inside surface by manipulation in your hands around a relatively small tube. I use 1/4" diam.
The inside surface is marked by the process but the outside is not.

It only 'permanently' deforms so far but Depron's natural flexibility, now enhanced by the crushing process, means quite a small radius can be achieved provided it can be secured in position.
A close fitting 2mm (but now down to 1.5) Depron tube around an AA cell.
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The head rest on the Fokker was done this way.
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Hope this helps.
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Old 09-25-2013, 02:05 PM
  #50  
CHELLIE
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Originally Posted by quorneng View Post
Chellie
As I am sure you are aware Depron (particularly the thin stuff) has a 'grain' and it bends nearly twice as well one way.
The trick I have found to bend thin Depron is to effectively 'crush' the inside surface by manipulation in your hands around a relatively small tube. I use 1/4" diam.
The inside surface is marked by the process but the outside is not.

It only 'permanently' deforms so far but Depron's natural flexibility, now enhanced by the crushing process, means quite a small radius can be achieved provided it can be secured in position.
A close fitting 2mm (but now down to 1.5) Depron tube around an AA cell.
Attachment 171139
In this view you can see the inside surface has just begun to crease although it is not visible on the outside.
Attachment 171140
The head rest on the Fokker was done this way.
Attachment 171141

Hope this helps.
Thank You very Much This was my First time working with 2mm Depron, I normally use 6mm and 9mm depron, I have learned to work with that, the 2mm depron sure fooled me I thought it would bend easier, because its so thin, Now I know the trick to bending it I even tried to heat it, Thats what i like about Scratch Building, your always learning something new Take care and have fun, Chellie
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