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Author Topic: F7f Tigercat plan by Dick Howard  (Read 2165 times)
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FLYACE1946
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« on: March 08, 2016, 01:42:13 PM »

Has anyone built this peanut yet ? Got any Advice on the proposed project ? Please share ok?

Thanks in advance.
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Bredehoft
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« Reply #1 on: March 08, 2016, 02:57:53 PM »

Gene Smith in Oklahoma flies - and wins with - a Peanut Tigercat - can't say for sure it is built from Dick Howard's plans.

--george
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FLYACE1946
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« Reply #2 on: March 08, 2016, 03:02:56 PM »

Yes he does and it's from the plan done by Dick Howard.
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Duncan McBride
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« Reply #3 on: September 19, 2019, 11:10:37 AM »

I just started one of these from the plans in the Plan Gallery.  The plans show a unique method of fuselage construction.  I gave up on that and made it a half shell, the former cross-sections are shown on the side view.  Was there a magazine article on this, or maybe a newsletter?  I saw Mike Kelly's Tigercat at the NonNats - very pretty airplane.
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tom arnold
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« Reply #4 on: September 19, 2019, 03:20:51 PM »

There was no magazine article on Dick's Tigercat as the plan was drawn up for the Cactus  Sqdn newsletter. The key to making this fly, I have been told, is the prop and motor combo and what it is, I don't know. Gene Smith would have the secret, though.
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mescal1
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« Reply #5 on: September 19, 2019, 03:32:57 PM »

I'll dig around for the newsletter.  I don't remember an article but there may be a short note.  Daughter has volleyball tonight but I'll try to post what I find tomorrow.
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FLYACE1946
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« Reply #6 on: September 20, 2019, 07:21:56 PM »

Thanks for the help. I still want to build this one. Any help would be appreciated. Since the plan also appeared in the FAC National Newsletter package there could be many people with this plan already interested. A short note could be very helpful.

I hope your daughters team won the game.
« Last Edit: September 20, 2019, 07:44:40 PM by FLYACE1946 » Logged
mescal1
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« Reply #7 on: September 20, 2019, 09:57:41 PM »

Thanks, They did Grin

The plan appeared in the Nov/Dec 1996 issue of the Cactus Squadron News.  I'll just type out everything.

Building the F7F-1 Grumman Tigercat Peanut
By Dr. Gene Smith

The model was built according to the plans using the crucifix style of construction shown on the plans.  Use 1/20 sq. sticks
and 1/32 sheet to keep the construction light.  The engine nacelles were built using 1/20 sq. sticks and 1/32 sheet bulkheads.
The model weighed 11.4 grams complete with props and with no ballast added for balancing.  Props were constructed using
cottage cheese container blades cut from the container at a standard 15 degree angle to the vertical.  Don't forget to cut 3 blades
for ccw rotation and 3 for cw rotation.  Prop rotation is ccw on the left and cw on the right as viewed from the front of the model.
Motors were .100 by 14 inches in length and no need to braid as the rubber all ends up on the CG with the short nacelles.  Normal
ramp freewheelers were used on the hubs.  The finish was thinned Floquill and Dope with painted Mica film trim used for the insignias
and markings.  Set in about 3 degree Down thrust in each nacelle and adjust the down thrust on either nacelle to the the power
pattern straight.  Motors will take about 1200 turns with 1600 maximum for flights in the 40 to 50 second range.  I have had one
thermal flight at the FAC NATS that was  timed at 3 min 20 sec.  What a Thrill!  Love this hobby!!!  Have at it peanuteers.  The twin
challenge is waiting.

I've seen Gene's model and it flies great.  The crucifix method of building is in the Sept 1985 Model Builder Fernando Ramos article.
Good luck!  (post pictures!)
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Duncan McBride
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« Reply #8 on: September 22, 2019, 03:34:21 PM »

Thanks for posting the text.  I would very much like to read about the crucifix construction. I got about halfway through the fuselage with the crucifix method but I made a big mistake - I thought the angled 1/20 sticks were sufficient to hold the stringers in the right position but it became obvious I should have added quarter-formers to round out the fuselage cross section.  I punted, and resorted to a method with which I had more experience.  Here is a shot of the fuselage and the nacelle sides.  What's in the picture weighs 1.7 grams.  I'll have to be careful.  But I'm pleased with how it's turned out so far, it is a very pretty airplane, so just getting reasonably close to scale looks pretty good.  Not a straight stringer on the thing, but the curves look real nice.
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Re: F7f Tigercat plan by Dick Howard
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mescal1
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« Reply #9 on: September 22, 2019, 04:15:13 PM »

Looks great!  Here's some motivation. 
https://www.youtube.com/watch?v=baNOKx2XZxM
Mike
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MKelly
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« Reply #10 on: September 22, 2019, 04:49:07 PM »

That's looking quite nice Duncan!  Have you picked colors for it yet?

Cheers,

Mike
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FLYACE1946
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« Reply #11 on: September 23, 2019, 10:00:33 PM »

Sure nice to see the information. Especially the Gene Smith sequence. Gene is very helpful.  Chop that balsa as Joe Joseph used to say.

Thanks everybody.
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Duncan McBride
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« Reply #12 on: October 01, 2019, 10:04:34 PM »

Some can build a great looking model of a homely airplane, but I do better with really pretty ones.  I just had to tack the parts together to see.  So far, so good.  

Not certain but I'm leaning towards the standard blue color scheme for the F7F-1.  That's all I have found good documentation for so far, and it will be far easier to do with tissue.  I'm trying to be as weight conscious as possible. The total is 5.1 grams so far and I have prop blocks, props, canopy, covering and markings yet to do.
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Re: F7f Tigercat plan by Dick Howard
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Crabby
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« Reply #13 on: October 02, 2019, 09:03:42 AM »

Great going Duncan are you gonna try it out at the compound?
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Duncan McBride
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« Reply #14 on: October 02, 2019, 03:49:11 PM »

Sure hope to.
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Duncan McBride
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« Reply #15 on: November 07, 2019, 08:08:48 AM »

Well it flies, and better than I hoped.  Really, right off the board - all I have done is tweak a little left rudder to open up the right turn under power.  It even glides pretty good as long as neither motor bunches up in the back.  If that happens the prop starts to freewheel while the other is still under power, and the plane spirals in.  Have to figure out some tiny floating pegs.

The props are 4 inches in diameter, 5 inches in pitch.  Cut from a small sour cream plastic container, angled around 25 degrees.  Counter rotating with the tips moving outboard on top.  There is a close-up of a front end, with the Nason clutch.  I'm using a 12 inch loop of 1/16, braided.  Have to make left and right-handed motors  Smiley

I haven't got it to Palm Bay yet, but flew it at the Kudzu Classic in Raeford - longest flight was 45 seconds.  Really fun to watch, I just hope this isn't beginners luck!
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Re: F7f Tigercat plan by Dick Howard
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Bredehoft
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« Reply #16 on: November 07, 2019, 08:19:21 AM »

Well done, Duncan!  45 seconds is great. 

--george
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MKelly
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« Reply #17 on: November 07, 2019, 08:22:39 AM »

That's a beauty Duncan - congrats on the successful flights.  If you find a working solution to the bunching please share it - I'm struggling with that on both my Skyrocket and the Diels Tigercat, even with tube-over-tube at the rear pegs.

Mike
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Bredehoft
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« Reply #18 on: November 07, 2019, 09:59:59 AM »

If you find a working solution to the bunching please share it ...

shorter motors ;-)

I help where I can...

--george
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Crabby
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« Reply #19 on: November 07, 2019, 11:21:18 AM »

Good am Duncan and a beauty of a job. I like Dick Howard plans they are easy on the eyes and compelling. I have to summon the mojo to finish the Piper Navajo. Of course building a twin means making a winding stooge and a launching apparatus. How did you tackle those items?
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Duncan McBride
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« Reply #20 on: November 07, 2019, 12:35:07 PM »

Hi Crabby,
The stooge was pretty simple - I got the idea from Tom Hallman's solution for his Mig Dis on you tube.  It is a little custom stooge from 1/8" craft plywood that connects to my regular stooge.  the back of the plywood base fits in the bottom of the big stooge, where I drilled holes so a wire stuck through the big stooge retains the little one.  I glued a cross piece of ply so the wire holds it down and in.

The little stooge just has ply uprights for each nacelle and a little cushion of foam.  I can wind one motor and just let the prop hit the front of the stooge, that is enough to hold it while I wind the other motor.  To remove it I just hold the plane by the nose and let the props hit my hand, pull out the wire retainers and it's ready to go.

It wouldn't be hard to make the uprights movable to use the little stooge for more than one plane.  Next time...
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Re: F7f Tigercat plan by Dick Howard
Re: F7f Tigercat plan by Dick Howard
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MKelly
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« Reply #21 on: November 07, 2019, 02:31:03 PM »

A dedicated twin stooge is nice but not required - I wind my Tigercat and Skyrocket on my (ugly) single stooge.  Pin one nacelle, wind, restrain the wound prop with a remove-before-flight pin, swap to the other nacelle, wind that one (see pics).  Allen is steadying the model in the second picture, but that's a convenience rather than a necessity.

Just don't forget and start winding #2 without pinning that nacelle in the stooge...

Mike
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tom arnold
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« Reply #22 on: November 07, 2019, 03:55:46 PM »

Same here. A single stooge works fine. oops can't figure out how to rotate the photo.
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Duncan McBride
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« Reply #23 on: November 07, 2019, 04:30:43 PM »

Well you can't argue with success.  I was thinking there would be too much weight or wind load on the nacelle peg with the plane hanging on the end, but you guys are certainly making it work.  Not the first time I've overthought things. Thanks.

Mike, on motor bunching, I'm trying something I heard from Stew Myers via Dan Driscoll:  You can take a plastic drinking straw, hold the end up to a match and watch it curl back on itself to make half a little bobbin.  Cut the straw to the right length (practice) so when you melt the other end you end up with a cute little bobbin.

Photos show the first melted end on the straw, after the second melt, the bobbin in the motor, and the bobbin loaded on a little stuffing stick.  That is a single loop of 1/16 rubber for scale.  The straw is a loose fit on a 1/8" aluminum peg.

We'll see how it works.
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Re: F7f Tigercat plan by Dick Howard
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« Reply #24 on: November 07, 2019, 06:43:31 PM »

What a neat idea Duncan.

John
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