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Author Topic: F7f Tigercat plan by Dick Howard  (Read 2166 times)
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Pat D
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« Reply #25 on: November 08, 2019, 09:37:31 AM »

here here !

that really is very clever

Pat !
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Crabby
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« Reply #26 on: November 08, 2019, 10:14:11 AM »

If you told me that was what you were gonna try I'd be a doubting Thomas. Now I gotta start feverishly collecting drinking straws before they are outlawed.
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Duncan McBride
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« Reply #27 on: November 20, 2019, 09:18:27 PM »

Got some flights in at Palm Bay this morning.  Tricky to launch one-handed but the plane handled it just fine.  The turn widens as the power burst winds down.  Still ends up gliding either way depending on which prop freewheels better.  The little plastic bobbins work ok, but there is still some random bunching.

https://www.youtube.com/watch?v=Z9_ir3GG1i0
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MKelly
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« Reply #28 on: November 20, 2019, 10:32:37 PM »

Great flight Duncan!  I need to try some of those straw bobbins...

Mike
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OZPAF
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« Reply #29 on: November 21, 2019, 01:39:01 AM »

Very impressive Duncan!
John
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Walt
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« Reply #30 on: November 21, 2019, 10:32:13 PM »

Duncan- beautiful flights on the twin and Jimmy Allen!  Thanks for posting the videos. Great work!
Wally
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FLYACE1946
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« Reply #31 on: November 24, 2019, 06:37:55 PM »

That is a great flying location. Sure would like to make it down there sometime. My old friend George Perryman went there often. Usually right after family get togethers around Christmas time. Sure do miss talking to him.

Allen
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FLYACE1946
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« Reply #32 on: June 20, 2020, 04:45:22 PM »

I want to do a Tigercat but first up will be my Piper Navajo . Gotta do that first.
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FLYACE1946
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« Reply #33 on: July 09, 2020, 07:20:17 PM »

I just have to ask this question: On the plan for the F7F-1 Tigercat Dick shows two sticks that are hatched. Is this done on each side of the fuselage? I know to use the 1/20 th size sticks and 1/32 sheet balsa for the bulkheads. I need to see (if at all possible)what the crucifix style looks like for this project. I must be over thinking it somehow.
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Duncan McBride
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« Reply #34 on: Today at 12:26:05 PM »

I couldn't figure it out either.  I ended up cutting some regular bulkheads and putting on stringers.
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Indoorflyer
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« Reply #35 on: Today at 12:27:06 PM »

Those cross hatched strips go down the center of the fuselage--they form the central keel that captures the cross member of each bulkhead/station. Earlier in this topic, the Sep 1985 Model BUilder magazine was mentioned as a ref for this type of fuselage construction.

In the view of the bulkhead/former, you can see the two beams in the center, one above the other

EDIT: here's my take on it:

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Re: F7f Tigercat plan by Dick Howard
« Last Edit: Today at 01:55:45 PM by Indoorflyer » Logged
FLYACE1946
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« Reply #36 on: Today at 01:12:35 PM »

Thank You that is just what I needed to see. Thanks a bunch. Indoorflyer did you draw this up yourself or was it in the Model Builder magazine column?
« Last Edit: Today at 01:28:21 PM by FLYACE1946 » Logged
Indoorflyer
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« Reply #37 on: Today at 01:46:12 PM »

Hi Flyace--I just made a very quick sketch on a scratch pad---Once you see the keel  the "Aha" moment strikes!  The keel with its "arms" forms the cruciform spine.   It's a very interesting design, should be pretty rigid, since the bulkheads have a triangular skeleton, and the oval fuselage cross section is created with thin sheet pieces attached to the legs of the triangles. (Don't know why my picture is rotated 90 degrees, maybe I should use my phone to crop and rotate it)

EDIT:  rotated the image in Post #35
« Last Edit: Today at 01:57:46 PM by Indoorflyer » Logged
FLYACE1946
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« Reply #38 on: Today at 06:23:29 PM »

I really like the sketch you did. Helps a lot. 
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Indoorflyer
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« Reply #39 on: Today at 06:35:04 PM »

Thanks--glad it helps folks visualize the thing.  That Tigercat is a perfect subject for a rubber FF model. Nacelles are roomy enough for decent size rubber motors.  The fuselage construction is optimized for the twin layout--it wouldn't work for a standard single engine type with the rubber going through the middle of the fuselage.  A CAD drawing of the entire fuselage would be a helpful building aid...
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