Showmaster Camber/Dihedral
07-07-2005, 10:10 PM
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Showmaster Camber/Dihedral
I am making a shopping list to start a scratch built (from plans) Showmaster. I acquired the plans about 15 years ago from RC Modeler. The camber of the wing seems too aggressive. Can I make the wing more like a trainer wing (flat bottom) but still keep the overall wing area the same without changing anything else? In other words, if I lose lift due to less wing camber, can I just plan on putting more power up front to make up for it? Lastly, if I eliminate the dihedral will it affect anything else other than stability? Thanks for your thoughts...
-S&L Flt
-S&L Flt
07-07-2005, 10:28 PM
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RE: Showmaster Camber/Dihedral
A picture would help, but in essence, the flat-bottom wing won't hurt. And you'd probably not need to change the power at all as the drag will be less.
Low or no dihedral will require ailerons.
Low or no dihedral will require ailerons.
07-07-2005, 10:47 PM
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RE: Showmaster Camber/Dihedral
Showmaster as designed flys quite well with rudder/elevator/throttle. Mine could fly tight little circles around me, and the only problem was not swatting it out of the air with the transmitter antenna. Thirty five years since I first flew one, I still have the wing.
07-08-2005, 05:31 AM
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RE: Showmaster Camber/Dihedral
ORIGINAL: HighPlains
Showmaster as designed flys quite well with rudder/elevator/throttle. Mine could fly tight little circles around me, and the only problem was not swatting it out of the air with the transmitter antenna. Thirty five years since I first flew one, I still have the wing.
Showmaster as designed flys quite well with rudder/elevator/throttle. Mine could fly tight little circles around me, and the only problem was not swatting it out of the air with the transmitter antenna. Thirty five years since I first flew one, I still have the wing.
It was neat to hear these plans have been around for so long (I'm 36). I heard the aircraft flew quite well. I thought I might remove the dihedral and add ailerons. Instead of the "Golden Bee" .049, I thought about adding a brushless electric motor. Sounds like you suggest leaving the original design as is... Happy flying...
S&L Flt
07-08-2005, 11:07 PM
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RE: Showmaster Camber/Dihedral
The Showmaster was intended to have lots of both lift and drag to let it fly slowly in a very tight area. Making the airfoil more flat bottomed will let it fly faster. But leave the dihedral alone unless you are adding ailerons. Dihedral works in conjunction with rudder throw to roll and turn the model. If you reduce the dihedral you will loose some of the snappiness of the model to the rudder inputs.
07-09-2005, 12:16 AM
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RE: Showmaster Camber/Dihedral
I was a junior in HS at the time. It had the throttle sleeve .049, with 3 KPS-12 servos (the extreme of small back then at 1.2 oz each) and a 500 mAH center tapped battery pack. It was flying at about 17-18 oz and would thermal on a good day (I almost lost it in one). It is very dependent on having no tear's in the covering on the wing. It would great on a light brushless system.
Years later after college, I was in the same club as Ken Willard, the Pioneers in the Bay Area of California.
Years later after college, I was in the same club as Ken Willard, the Pioneers in the Bay Area of California.
07-09-2005, 07:07 PM
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RE: Showmaster Camber/Dihedral
ORIGINAL: HighPlains
I was a junior in HS at the time. It had the throttle sleeve .049, with 3 KPS-12 servos (the extreme of small back then at 1.2 oz each) and a 500 mAH center tapped battery pack. It was flying at about 17-18 oz and would thermal on a good day (I almost lost it in one). It is very dependent on having no tear's in the covering on the wing. It would great on a light brushless system.
Years later after college, I was in the same club as Ken Willard, the Pioneers in the Bay Area of California.
I was a junior in HS at the time. It had the throttle sleeve .049, with 3 KPS-12 servos (the extreme of small back then at 1.2 oz each) and a 500 mAH center tapped battery pack. It was flying at about 17-18 oz and would thermal on a good day (I almost lost it in one). It is very dependent on having no tear's in the covering on the wing. It would great on a light brushless system.
Years later after college, I was in the same club as Ken Willard, the Pioneers in the Bay Area of California.
Wow. It sounds like I stumbled upon a model with lots of history. I guess my idea of making it a nice electric flyer is not too far off. I do plan on adding ailerons. Neat story. (By the way, I grew up in Danville, CA). Happy Flying...
Cheers,
S&L Flt
