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Zenoah G20ei Power

Old 07-23-2015, 06:24 PM
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6LQQKR2
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Question Zenoah G20ei Power





I have scratch built a Taylor Craft. It has a 72" wingspan with a 13" constant cord giving it a wing area of 6-1/2 sq. ft. The plane weighs 11-1/2 lbs. all up with and empty fuel tank. I, therefore, have calculated the wing loading to be just a little over 28.38 oz. per sq. ft. With a fish scale anchored and attached to the tail of the airplane, have run the airplane at full throttle and have gotten a reading of 11-1/2 lbs of pull on the fish scale. Has anyone had experience with this engine flown on a high wing of this size and weight. This is my first experience with an engine of this size on an air frame of this size and weight. With that being said, I am a little reluctant to make a maiden flight. Replies from any one with thoughts on this question will be greatly appreciated.
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Old 07-24-2015, 04:10 AM
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TomCrump
 
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A 11 pound, 72" Taylorcraft sounds heavy. Did you add a lot of interior detail ?

I would guess that a G-20 would fly it in a scale manner.

I flew my 90" T-craft on a G-26, at 15 pounds.
Old 07-24-2015, 09:23 AM
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The G 20 should be an excellent match for your plane. Suggest a 17X6 prop or 16X8 if you want a little more speed.

One other thing: using your wing area 6.5 square feet =936 square inches. 12 lbs (your 11 1/2 + 1/2 for fuel = 192oz) divided by 936= 20.5 wing loading.

Last edited by RCVFR; 07-24-2015 at 09:40 AM.
Old 07-24-2015, 01:29 PM
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Using your weight of 12 lbs. I get a wing loading of 29.5384+. 936 sq .inches divided by 144 = 6.5 sq. ft.divided into 192 oz.= 29.5384+. I did not mention that I was using a 15X6 prop to get the
11-1/2 lbs of pull on the scale. I will give the 16x8 prop some consideration. Thanks for you reply.
Dennis
Old 07-24-2015, 01:53 PM
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Did not do any interior detail. Actually, I took the plans from a now defunct Ace Taylorcraft kit, which had a wingspan of 89.5", and scaled them down to a 72" wingspan. I gained some of the weight
by the use of aircraft spruce for fuselage longerons and top and bottom spars of the wing panels. I also made a fiberglass cowl from a plug that I made from green foam block sanded to shape and then
fiberglassed. The picture that accompanies my original post is of the plane. The original landing gear was bent from 5/32" piano wire but I replaced that with the gear that is/was used on the Hanger 9 1/4 scale airplane
which worked perfectly. I did not trust the wire landing gear. All of those items did add weight to the plane. The covering is MonoKote.
Thanks for your reply.

Dennis
Old 07-24-2015, 01:56 PM
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Originally Posted by TomCrump View Post
A 11 pound, 72" Taylorcraft sounds heavy. Did you add a lot of interior detail ?

I would guess that a G-20 would fly it in a scale manner.

I flew my 90" T-craft on a G-26, at 15 pounds.
Tom,
Did not do any interior detail. Actually, I took the plans from a now defunct Ace Taylorcraft kit, which had a wingspan of 89.5", and scaled them down to a 72" wingspan. I gained some of the weight
by the use of aircraft spruce for fuselage longerons and top and bottom spars of the wing panels. I also made a fiberglass cowl from a plug that I made from green foam block sanded to shape and then
fiberglassed. The picture that accompanies my original post is of the plane. The original landing gear was bent from 5/32" piano wire but I replaced that with the gear that is/was used on the Hanger 9 1/4 scale airplane
which worked perfectly. I did not trust the wire landing gear. All of those items did add weight to the plane. The covering is MonoKote.
Thanks for your reply.

Dennis
Old 07-24-2015, 05:57 PM
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handyman
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hers one.frist off nice JOB.........as to power its rite on.......enjoy it

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