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Diels F7F Build - My First Twin (Read 9062 times)
Reply #94 - Sep 18th, 2017 at 2:06pm

LASTWOODSMAN   Online
Senior Member
REAL PLANES HAD ROUND
ENGINES AND TWO WINGS
Windsor, Ontario, Canada

Posts: 878
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Mike - thanks for the detailed technique and pics !   What a beautiful
extravagant
build !!
LWM
 

OH, I HAVE SLIPPED THE SURLY BONDS OF EARTH ... UP, UP THE LONG DELIRIOUS BURNING BLUE ... SUNWARD I'VE CLIMBED AND JOINED THE TUMBLING MIRTH OF SUN-SPLIT CLOUDS ...
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Reply #93 - Sep 17th, 2017 at 7:29pm

Sky9pilot   Offline
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Kelso, WA 98626 USA

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Fantastic job on the exhaust ports and cooling ports on the cowlings.  This is really going to be an outstanding model!!!!  Smiley
Tom
 

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Reply #92 - Sep 17th, 2017 at 6:17pm

MKelly   Offline
Full Member
Helotes, TX

Posts: 224
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To me, all the scoops and exhausts add a lot of character to aircraft, so I try to include what's practical into the model.  The Tigercat's big radials need room to breathe, so there are cutouts for the exhausts top, bottom, left and right on each nacelle.  The plan doesn't say much of anything about them, so I improvised.

I scaled a 3-view to match the plan, overlayed it to see where the cutouts sat with respect to the model's framework, compared that to pictures, then printed and cut out templates (one for the bottom, one for the sides).  Since the templates were cut from the plan, the part lines on the plan can be used to align them to the nacelle structure.

The cutouts cross the keels, so I glued small gussets from the keels to the former at the rear of the cowlings.  Then I shaved the keels to match the bevel of the cutouts - this provided a reference for chiseling out the cutouts later.

I glued soft 1/8" sheet blocks aft of the cowls where the cutouts would be, then sanded them to match the contours of the nacelle.

Next I taped the templates over the nacelle, lining them up using the plan markings.

I carved out the cutouts using an x-acto chisel blade.  Finish sanding was done with an emery board trimmed to a square edge on one end.

The cutouts on the real aircraft are a little rough, so no need to get perfect corners and surfaces.  Out of curiosity I weighed the nacelles before and after - the cutouts added .2 grams to each one.

Now on to the wing-nacelle junction...

Mike
« Last Edit: Sep 17th, 2017 at 7:19pm by MKelly »  
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Reply #91 - Sep 17th, 2017 at 7:59am

New Builder   Offline
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Amherstburg, Ontario, Canada

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Got it. Thanks again strat-o
 
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Reply #90 - Sep 17th, 2017 at 6:50am

MKelly   Offline
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Helotes, TX

Posts: 224
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Yep, that's the one - thanks strat-o.

Mike
 
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Reply #89 - Sep 16th, 2017 at 1:07pm

strat-o   Offline
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Reply #88 - Sep 16th, 2017 at 11:08am

New Builder   Offline
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Amherstburg, Ontario, Canada

Posts: 234
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Quote:
This method was recommended to me during my Waco build and works very well for circular cowls

I have been looking for the thread on your Waco build but no luck as yet. Can anybody direct me?
 
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Reply #87 - Sep 16th, 2017 at 10:25am

Craig 3   Online
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I Love YaBB 2.5 AE!
West Virginia, USA

Posts: 370
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The only way that could be any smoother would be if you were working with butter instead of balsa!
 
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Reply #86 - Sep 13th, 2017 at 8:45am

New Builder   Offline
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Amherstburg, Ontario, Canada

Posts: 234
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Quote:
Made a profile sander for the cowls (see picture) and contoured the front of the nacelles today

This is definitely going to be added to my Gee Bee (and other Golden Age Racers) tool box. Thanks Mike
Mike
 
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Reply #85 - Sep 12th, 2017 at 9:53pm

MKelly   Offline
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Helotes, TX

Posts: 224
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LWM, you've got it.  The black area is 400-grit sandpaper.
 
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Reply #84 - Sep 12th, 2017 at 9:03pm

LASTWOODSMAN   Online
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REAL PLANES HAD ROUND
ENGINES AND TWO WINGS
Windsor, Ontario, Canada

Posts: 878
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So mike,  that round plug is glued to the thick template of the profile sander, and that round plug spins inside the nose, and the sandpaper is on that black area only on the inside of the template?  Is that black area actually black-colored sandpaper?  The nacelles do look very smooth and even ...  Smiley
LWM
 

OH, I HAVE SLIPPED THE SURLY BONDS OF EARTH ... UP, UP THE LONG DELIRIOUS BURNING BLUE ... SUNWARD I'VE CLIMBED AND JOINED THE TUMBLING MIRTH OF SUN-SPLIT CLOUDS ...
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Reply #83 - Sep 11th, 2017 at 10:25pm

MKelly   Offline
Full Member
Helotes, TX

Posts: 224
***
 
Made a profile sander for the cowls (see picture) and contoured the front of the nacelles today.  This method was recommended to me during my Waco build and works very well for circular cowls.

I use a sanding stick to rough in the shape (checking periodically using the profile sander as a template).  Once the shape is close the sander is inserted in the cowl opening and rotated to fine-tune the contour. 

I've got it pretty close - time to sleep on it and check it again in the morning.
 
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Reply #82 - Sep 10th, 2017 at 12:30am

bigrip74   Offline
Global Moderator
What did l do this time!
Austin, Texas

Posts: 4921
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AHH! Cheesy Come on Mike your killing me with your beautiful build and these photos are just too tempting, but with all that is going on at the moment I
cannot
start an
F7F
Grin

Keep up the good work and please keep posting those photos.

Bob
 

IF IT AINT BROKE DONT FIX IT!
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Reply #81 - Sep 8th, 2017 at 3:01pm

LASTWOODSMAN   Online
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REAL PLANES HAD ROUND
ENGINES AND TWO WINGS
Windsor, Ontario, Canada

Posts: 878
****
 
SUPER PICS GUYS !!
   It's great when you guys post the
best
pics! Smiley
LWM
 

OH, I HAVE SLIPPED THE SURLY BONDS OF EARTH ... UP, UP THE LONG DELIRIOUS BURNING BLUE ... SUNWARD I'VE CLIMBED AND JOINED THE TUMBLING MIRTH OF SUN-SPLIT CLOUDS ...
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Reply #80 - Sep 8th, 2017 at 12:17pm

Sky9pilot   Offline
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Stick & Tissue
Kelso, WA 98626 USA

Posts: 8473
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There's always "40", but "32" does have some different schemes:
Tom
 

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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