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  1. #151

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    RE: Thorpe F-20 build

    Starting to look like an airplane...
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  2. #152
    Love To build's Avatar
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    RE: Thorpe F-20 build

    Very nice work Terry. 4 pounds? Nice.
    M4A3, M41, Elefant, Marine M4A3, Building M4A1E8

  3. #153

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    RE: Thorpe F-20 build

    Check the weight of the airplane as the difference of my weight and me holding the airplane on a bathroom scale. Of course the airplane is not finished yet. Just wanted any feedback from others who have built the plane. Does this sound about right? To me it seems rather heavy. I think a glass fuse and foam wings would be lighter.

    Rough shaped and glued the base for the vertical fin. Made from 3/8" balsa sheet and used 30 minute epoxy. Drilled the control tube with a 1/8" drill bit 12" long by hand.
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  4. #154
    Love To build's Avatar
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    RE: Thorpe F-20 build

    From what I read on different boards The all up weight is between 7 - 10 pounds depending on power type and options.
    M4A3, M41, Elefant, Marine M4A3, Building M4A1E8

  5. #155

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    RE: Thorpe F-20 build

    looking super-nice to see this thread at the top

  6. #156
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    RE: Thorpe F-20 build

    Terry, Did you happen to keep track of a wood list? I got the plans scanned into a PDF file, and I'm now tracing the parts in Autocad for lazer cutting or CNC a router table. I will be shooting for EDF with Electric retracts. I can modify the parts in CAD to accept the new system parts.


    Bill
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  7. #157
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    EDF Jet Jam 2015 - http://www.orvrcf.com/
    Cincinnati Jet Club, Team Futaba

  8. #158

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    RE: Thorpe F-20 build

    have you thought about using a terry nitsch colour scheme?

    maybe the famous one from his bvm ultra viper

  9. #159

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    RE: Thorpe F-20 build

    Agent adds- Not familiar with Terry's color scheme. Is it green and white? I recall many years ago he had a green and white Vipe that was ducted fan with smaller wings to get more speed. That was back in the Heart of Ohio Days at the airport. Do you happen to have a picture of the color scheme you could post?

    Bill- I did put together a list of wood sometime back. I'll see if I can dig it up and post it here.

    Bob- I bought a second set of plans from LDS as my old plans were cut up. The lines on the drawings from LDS were thicker but otherwise identical.

  10. #160

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    RE: Thorpe F-20 build

    hows this
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  11. #161

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    RE: Thorpe F-20 build

    That was it. I'm not fond of it myself. I never saw it fly. I heard it was fast. Terry was so busy taking care of others at the jet fly that I don't think he had any time left. Terry helped me maiden my first turbine, a bandit. A nice airplane but very expensive at the time. Those early versions had a problem with the vertical fin and mine suffered a failure in flight. Not the first flight, but later. Was nice while it lasted though. That was my last BVM model. Still sore over it and BV comments to me all these years later.

  12. #162

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    RE: Thorpe F-20 build

    how about these
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  13. #163

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    RE: Thorpe F-20 build

    All of those are very nice. Out of those, I liked the one on the right the best and the left the least. I was considering mostly black based on this picture shown below. Maybe add in some red or yellow to accent the wings and tail. Haven't decided yet though.
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  14. #164
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    RE: Thorpe F-20 build

    If that yellow Aggressor III ever shows up in the classifides, I'm going to buy it.

    As far as the color scheme you are contemplating, all I can tell you is that my F-20 that I had years ago (picture below) was a dark battleship gray. In the air, it was hard to see most of the time. Not a good thing when it's going 120 mph. I mostly depended on my instincts based on my control inputs, rather than the sillouette I kept seeing which caused illusions as to its direction and attitude in the sky. If you decide to use a basic black scheme, I suggest that you use yellow rather than red. At a distance, red will blend with the black. You always need a contrasting color.

    I'm also glad to read that your jet is only 4 pounds so far. With all the epoxy you were using, I expected it to be heavier. You must be using it sparingly. When I build with balsa, I use CA as much as possible. I hardly use epoxy, except for fuel-proofing or behind engine bulkheads. A good alternative to epoxy is Elmer's Carpenter's Wood Glue ... Very strong and light weight.
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    We in the Federal Government have no sense of humor that we are aware of.

  15. #165

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    RE: Thorpe F-20 build

    Ive been enjoying the build and am considering purchasing a kit. I was wandering if I could get a measurment where the turbine mounts to determine what size EDF fan would fit?

  16. #166

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    RE: Thorpe F-20 build

    Lovetobuild- here is the list of wood that I used when I started. I did not check it for perfect accuracy so you might find some errors. But it is close.

    9 ea 3/8” x 4” x 36” hard balsa sheet
    1 ea 1/8” thick x 12” x 36” aircraft plywood
    4 ea ¼” x 4” x 36” hard balsa sheet
    4 ea ½” x ½” x 36” balsa triangle
    1 ea ½” x ¼” x 36” balsa
    2 ea 3/16” x 4” x 36” hard balsa sheet
    24 ea 1/8” x 3/8” x 36” spruce
    2 ea 1/8” x ¼” x 36” spruce
    2 ea ½” x 3/8” x 9” maple (hardwood engine rails)
    2 ea 1/32” x 12” x 36” plywood (ducting)
    2 ea ¼” x 4” x 36” hard balsa sheet
    12 ea 3/16” x 3/16” x 36” balsa square (stringers)
    1 ea 3/16” x 3/16 x 36” spruce square (stringers in high stress areas)
    1 ea 1/16” x ¼” x 36” spruce (LE for horizontal and vertical stab)
    1 ea ¾” x 4” x 36” balsa sheet (fuse nose)
    18 ea 1/16” x 4” x 36” hard balsa sheet (sheeting for wings and fuse)

  17. #167

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    RE: Thorpe F-20 build

    Picard1- the Thorpe F-20 is for a 5" (127mm) size fan. Measurement between the rails on mine is 5.125" inside the rail and 6.25" outside the rail.

  18. #168

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    RE: Thorpe F-20 build

    Airplanes400- I have flown grey and black colored planes and the black is easier to see to me. Even on a dark overcast day. On a clear day, it is easier to see than a white plane. Red and black contrasts very well for my eyes. Particularly with red on the top of the wings. You would think otherwise, but it works. At least for a bright red color. Never tried a dark red. For some reason I always use more CA than epoxy when I glue the same parts together. I just don't trust the CA. I've had too many joints fail that were glued with CA. By the way, the plaster mold I made for the canopy has dried out and hardened. So far, no cracks. Will be molding some canopies soon.

  19. #169

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    RE: Thorpe F-20 build

    tlj125

    Thanks for the info on the fan size.

  20. #170
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    RE: Thorpe F-20 build

    Thanks Terry. Now to place an order.
    M4A3, M41, Elefant, Marine M4A3, Building M4A1E8

  21. #171

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    RE: Thorpe F-20 build

    Put the Wren 44 on a stand and ran it a few times to get familiar with it. I like the kero start feature. Very smooth start process and takes a little less time than my propane start Wren 75. Idles at about 55K rpm. From idle to full throttle takes about 5 seconds. From half to full takes about 1.5 seconds! Full throttle is about 195K rpm. Very surpised how little fuel was burned during my tests. I did not have any way to measure thrust. This is a cool little engine!

    Terry
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  22. #172

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    RE: Thorpe F-20 build

    Here are a few links to older videos showing various Thorpe Brothers airplanes flying including the F-20. These came from Ron Sweeney and his son Andrew.

    http://www.youtube.com/watch?v=jjbfw...ature=youtu.be

    http://www.youtube.com/watch?v=TpHs1...ature=youtu.be

    http://www.youtube.com/watch?v=XF1NY...ature=youtu.be

    Many thanks to Ron and Andrew for the videos. I remember the ducted fan days well. This is a walk down memory lane.

    Terry

  23. #173

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    RE: Thorpe F-20 build

    great viewing-proper modellers

  24. #174

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    RE: Thorpe F-20 build

    Great videos!!!

  25. #175

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    RE: Thorpe F-20 build

    Hi Guys
    Ron pointed me to this thread as I built one of these way back...must have been nearly 25 years ago now. Definitely a trip down memory lane! Nice to see all the problems shared by others too! Yes..very sticky snakes, PITA planking, snapping stringers...great design though! I spoke to Pete Thorpe last night, doesnt' fly so much now but still has all the bits for the kits, such as canopies and what-not for sale should anyone need them. Their website is currently down and sadly Pete doesnt use the internet much if at all. I'll get into him a bit over the near future and try to get him online.

    regards

    Dave


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