Camel build | Page 9 | FerrariChat

Camel build

Discussion in 'Aviation Chat' started by snj5, Sep 17, 2009.

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  1. Bob Parks

    Bob Parks F1 Veteran
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    Nov 29, 2003
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    Robert Parks
    I think that what you have is what the colorists call a CHANGELING where the color acts differently in incandescent light then it does in ultra-violet and sun light. As A wannabe artist I have found that my colors change when I look at a painting in daylight vs. normal incandescent bulb light. I paint in color corrected lighting at night when I must keep at it but as any artist, I mostly paint in daylight.
    Sure anxious to see the Camel on its own legs ready to go.
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  2. Bob Parks

    Bob Parks F1 Veteran
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    I don't think that I described changeling properly. Colors will APPEAR warmer or cooler in warm or cool light. A changeling changes its color as you described ie. from green to brown. Re flattener. When we repainted the L-3 we added Syloid 78 to the paint. I have an article on WW2 paint that explains the origin of the British " Type S". They found that looking at the captured or downed German aircraft that the paint was smooth and not rough or grainy as were the allied dull camo paints. Soon the paint was changed to the same mix as the german paints and thus became Type Smooth. It also increased cruise speed.
     
  3. tazandjan

    tazandjan Three Time F1 World Champ
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    Jul 19, 2008
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    Russ- Get it as close as possible on paint and all the details and it will pay dividends. As for the engine, remember, Fred's Camel nearly killed him because it was too realistic. The same thing that killed tons of British pilots in WW-I, low fuel pressure, nearly got Fred killed. As it was, he spent a considerable amount of time in the hospital recuperating. Not sure how his Camel rebuild is coming.

    Taz
    Terry Phillips
     
  4. Bob Parks

    Bob Parks F1 Veteran
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    The original Camel had the main fuel tank behind the cockpit so I assume that Russ's camel will have the same. Fuel pump...engine driven? outside source of power? wind driven? I hadn't thought about that with the new style engine.
     
  5. snj5

    snj5 F1 World Champ

    Feb 22, 2003
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    #205 snj5, Apr 22, 2010
    Last edited by a moderator: Sep 7, 2017
    The Sopwith F.1 Camel design is almost universally described as being "heavy on the tail" by contemporary and modern reports. The usual Great War pilot, in their 20's, weighed 150 - 170 pounds and was well under six feet tall. I am 51 years old, over six feet tall and well over 170 pounds. In addition to several other chalenges, we were looking at a possible rearward cg limit problem. A 22 gallon fuel tank was placed where the ammo bay normally was, ahead of the instrument panel, and the rear tanks deleted to help the wt & balance challenge of a modern American sized pilot, one in particular.
    Our Camel's 150 hp Rotec installation includes an engine driven mechanical fuel pump and a back-up electrical unit.

    Today we finished covering the fuselage through the silver anti-UV coat. We used a hoist on the crankshaft and a stand at the rear to provide a 'rotisserie' to rotate the plane.
    Attached are photos from this morning and afternoon. You will be able to see the fuel and ol tanks between the firewall and instrument panel. A final photo shows the relation of the pilot to the stick, throttle quad, carb heat, rudder bar and Aeronca heel brakes and trim wheel.
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  6. snj5

    snj5 F1 World Champ

    Feb 22, 2003
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    "A nose heavy airplane doesn't fly well and a tail heavy airplane doesn't fly long."
     
  7. tazandjan

    tazandjan Three Time F1 World Champ
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    #207 tazandjan, Apr 22, 2010
    Last edited by a moderator: Sep 7, 2017
    Russ- WW-I aircraft were usually rigged tail heavy because they spent most of the time climbing. Just about universal back then. The WW-I pilot was actually more like 120-150 lbs. They were much smaller than we are, even me at 5'7". Here is a photo of MvR (5'4") and Friessenhagen. Their feet are dangling from this bench.

    Taz
    Terry Phillips
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  8. Bob Parks

    Bob Parks F1 Veteran
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    It's a pleasure to see a well thought out approach to a program. I have flown with types who built or restored and then got in "to try it out". Most succeeded. The placement of the fuel tank forward of the cockpit makes sense of the CG considerations since there is no need of an ammo bay there and since you are a bit heavier than the old guys, aerodynamic CG location problems can be eliminated. The absence of weight transfer aft on the ground will help in handling too. Cockpit photos look great and do I see a fuel quantity sight gage on the left?
     
  9. snj5

    snj5 F1 World Champ

    Feb 22, 2003
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    Taz
    Great photo. I actually use MvR and Boelke's writings in teaching the USAF Flight Surgeon's course here in San Antonio.
    The peculiar geometry of the Camel's mass compression does not leave a lot of wiggle room in weight placement. I think I will be ok after moving the tanks forward, but won't know until the first weigh in...
     
  10. snj5

    snj5 F1 World Champ

    Feb 22, 2003
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    Such good attention to detail you have - yes, it is an exact duplicate of the original Sopwith fuel sight gage, complete with dual shutoff valve (in case shattered by shrapnel)and float ball.
     
  11. Bob Parks

    Bob Parks F1 Veteran
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    When I looked at that glass tube I cranked up my old head and remembered a couple of airplanes in which I had flown that were equipped with glass sight tubes. My old L-3, the Stearman PT-13, and believe it or not, the B-24. The '24 had a glass tube mounted on the flight deck bulkhead to measure fuel. Scary. It always smelled of fuel.
    Another memorable experience with a sight gage was when Joe Hughes aborted his act at Abottsford when the sight tube on his airplane cracked and started to leak. I don't know whether I was stupid or full of bravado but I figured that if I had the correct size plug and a bit of luck, I could unscrew the sight gage and get the plug installed real quick without loosing too much of the 40 gallons of fuel in the tank. We got the plug from the Conair shop and a wrench and performed the operation successfully without too much fuel loss. Stupid? Yes. Lucky ? Yes. Bravado? Back to stupid.
    Next year Joe took me to his airplane and showed me an emergency kit in the baggage compartment that contained a spare sight tube, a plug (same one) , and a wrench.
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  12. Bob Parks

    Bob Parks F1 Veteran
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    I forgot to mention that Joe Hughes flew a 650 HP Stearman with a wing walker/rider. First was John Kazian, second Gordy McCollum who was killed at Reno in 1976-77.
     
  13. tazandjan

    tazandjan Three Time F1 World Champ
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    Russ- If you have a minor problem, you can always play with the angle of incidence of the horizontal tailplane. IIRC, the SE-5a actually had a cockpit control for tailplane incidence, the closest thing they had to trim back then. A similar device was fitted to some German 2 seaters.

    Taz
    Terry Phillips
     
  14. snj5

    snj5 F1 World Champ

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    #214 snj5, Apr 23, 2010
    Last edited: Apr 23, 2010
    Taz-
    Yes, that is in the test flight flow chart. The tailplane is adjustable by design on the ground. They've gone through this routine on some of his previous designs. We will start with the neutral rigging settings with respect to the calculated cg. The airplane also has a very sl. downward thrust line to consider as well.
    I am cautiously optomistic.
    Of course the one thing that would really be interesting was if it came out nose heavy, although I doubt it
    As many homebuilts, we're waiting till the first weigh in to position the battery(although small) if possible to fine tune.
    Thanks!
     
  15. Bob Parks

    Bob Parks F1 Veteran
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    I don't know if you can go wrong by adhering to the 25 percent chord rule for initial aerodynamic balance, the good ol' 1/4 MAC. Get that established with you and the fuel in it and you shouldn't have a problem. You are a careful and thinking pilot and that is a huge plus in this show.
     
  16. snj5

    snj5 F1 World Champ

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    Exactly - we're shooting for 25%, with the window being 18 - 28%. With everything so piled up front, it's hard to intuitively know.
     
  17. Bob Parks

    Bob Parks F1 Veteran
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    #217 Bob Parks, Apr 24, 2010
    Last edited by a moderator: Sep 7, 2017
    Russ, I got restless before lunch and I decided to take a shot at where the CG should end up. I have some drawings of the Camel, quite small but dimensioned, and I just had to settle my curiosity with a stab at CG location on the airplane. I'll admit that it is a rough sketch and not the final word but I took a crack at finding out where the CG might be based on what I have.It'll be interesting to see how close I came when you and the crew work it out.
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  18. solofast

    solofast Formula 3

    Oct 8, 2007
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    Russ,

    I'm a bit suprised that you haven't put together a excel spreadsheet that you can use to keep track of the weight and the CG. I wouldn't take more than a few minutes to get it started and you could, with a relatively inexpensive electronic scale get a really good idea of where you are with the whole thing. You can weigh whatever you have up to now and find the CG of that, and then weigh what parts aren't on the whole thing, figure a location and load them into the spreadsheet.

    Better to know now while you can still move things about as opposed to getting it a lot further along and saying "whoops" and then having to move stuff around.....

    While it isn't perfect it could save you a lot of grief later.
     
  19. snj5

    snj5 F1 World Champ

    Feb 22, 2003
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    Thanks everyone! Bob's drawings also are in tune to what we have. The desired 25% MAC cg is just abaft of the instrument panel
    We may be pretty close. Not being a computer type guy, we have been following this longhand, keeping close to the Sopwith drawings and making some adjustments, and know some things we can move around. Of course being fabric covered and painted by component, the last big assembly is the one that will tell.
    Also, it seems this plane is probably a bit heavier than I thought it would be, but still less than the original.
    We've also learned a lot as we went along (isn't that always the case!), much about the variations of the original plane between contractors, and trying to adapt British fittings to American fittings to Metric fittings.
    We are about 2 months from finishing, so we will soon know. Even then, I imagine the plane will be continually tweaked for a while.
    Many thanks.
     
  20. snj5

    snj5 F1 World Champ

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    Just so happens that someone sent me the EAA wt & balance spreadsheet estimator today. With my best wags and the wt estimator puts the aircraft empty weight at about 840 pounds (sounds about right). With me and full fuel, the CG comes out to 21% MAC, with little change at min fuel.

    While highly a WAG, it is a bit re-assuring.
     
  21. Bob Parks

    Bob Parks F1 Veteran
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    I just had a gut feeling that moving the tank forward and your modern stature would put the CG a bit forward, which is good.I have assumed that the Rotec is about the same weight or somewhat lighter than the rotary. There is nothing quite as frightening is flying something that wants to squat in spite of everything you try to keep it from doing it. Sensitive buttocks and a gentle stick doesn't work every time.
     
  22. PSk

    PSk F1 World Champ

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    Subscribed.

    I recently found out that you can buy 80% and 90% replicas of the Spitfire ... which I had the money as I'd be interested in building one of those kits.
    Pete
     
  23. solofast

    solofast Formula 3

    Oct 8, 2007
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    Russ,

    That's great, it's surprising how accurate these things can be be, the sum of the errors tend to work themselves out. As the old saying goes... "It's much like a partner that moans in bed, it's not that it's so pleasant to hear, but it's nice to let you know how you're doing"
     
  24. snj5

    snj5 F1 World Champ

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    #224 snj5, Apr 28, 2010
    Last edited by a moderator: Sep 7, 2017
    Yes - I've learned this week with biplanes MAC is not what it seems with stagger and seperation of the wing surfaces; I imagine it is even more complicated in a swept sesquiplane like a Nieuport 11 or 17.

    It may sound a bit strange, but this little plane is causing more excitement for me than either the T-6 or T-28. It has components of all the facets of flying that appeal to me without the cost. This plane is cheaper to build from scratch than the first year of operating costs for the T-28...and it's LSA rules.

    I realize its not for everybody, but what fun, pure flying.

    And I need one of you Texas guys to get a full size Albatross DIII or Dr. I Triplane replica so we can fly formation to shows..
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  25. Bob Parks

    Bob Parks F1 Veteran
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    Oh, If I was younger and a bit richer I would have an SE5 at your wing tip. Somewhere I have an in-flight shot of my flying in formation with the Pietenpol. Those were the days.
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