Author Topic: F7U-3 Cutlass conversion  (Read 5216 times)

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Online Scotaidh

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F7U-3 Cutlass conversion
« on: April 07, 2018, 08:54:44 am »
One of my projects for this year is to up-rate the engines in a Cutlass.  The engines I want are the J79s from an F-4 Phantom.  Looking at it, I realized that there are two ways to do this.

One is to just implant the engines and adjust the Cutlass' fuselage.  I did some math. <ugh>  The Cutlass' original engines, J-34s, were/are 112 inches long by 27 inches in diameter.  In 1/72 scale, that's about 1.5 inches long by 0.33 inches in diameter. 
The J-79 is 208.8 inches long by 38.4 inches in diameter - which is about 3 inches long by 1/2 inch in diameter.  This will require some shoe-hornery to fit - or a lot of PSR.
Ideally, it would look something like this:


The other option is to co-opt the F-4's complete wing & engine section, with the Cutlass cockpit and stabilizers attached.  Ideally again, that would look a bit like this:
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Offline salt6

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Re: F7U-3 Cutlass conversion
« Reply #1 on: April 07, 2018, 09:01:55 am »
They both look good.   :thumbsup:
Steve B


"The time has come,
         The Walrus said,
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      Of cabbages and kings
And why the sea is boiling hot
      And whether pigs have wings."

Online Scotaidh

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Re: F7U-3 Cutlass conversion
« Reply #2 on: April 07, 2018, 09:27:49 am »
Thanks, O Salty One.  :)


Work to date.  I'm using yard-sale sign plastic as an underpinning for the fuselage centre stips.  It will also be used to increase the area of the vertical stabilizers, as I think the added thrust will require some taming.  Also, IIRC, the aircraft suffered from stability problems, as well as lack of power.

The items in the yellow box are the J-79 exhaust nozzles - you can see how over-size they appear next to the Cutlass.

I'm looking through the SSR for a replacement canopy - something a little more ... couth, I guess - one that actually lets the pilot see behind him. 
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Offline The Rat

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Re: F7U-3 Cutlass conversion
« Reply #3 on: April 07, 2018, 12:11:38 pm »
One of the changes I've often toyed with, other than changing the engines of course, is extending the forward fuselage a bit and adding canards.
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Offline ysi_maniac

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Re: F7U-3 Cutlass conversion
« Reply #4 on: April 07, 2018, 12:17:08 pm »
Advanced studies of whiffery!
 :thumbsup: :thumbsup: :thumbsup:
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Offline The Rat

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Re: F7U-3 Cutlass conversion
« Reply #5 on: April 07, 2018, 12:18:09 pm »
Just went to my notes. The engine I was planning on was a license built RR Avon, length: 126 in., diameter: 35.7 in., with almost 3x thrust.
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Offline JayBee

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Re: F7U-3 Cutlass conversion
« Reply #6 on: April 07, 2018, 01:20:57 pm »
This may or may not help, but it appeared in a number of US magazines some years ago.

Ladies, Gentlemen, and Whiffers, I present the F-7D Cutlass.


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Online Scotaidh

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Re: F7U-3 Cutlass conversion
« Reply #7 on: April 07, 2018, 04:43:37 pm »
Just went to my notes. The engine I was planning on was a license built RR Avon, length: 126 in., diameter: 35.7 in., with almost 3x thrust.

I've got one in mind for the RAF, using an F-4K with its RR Speys.  I'm looking for some 1/2" outside diameter tubing to mock up the engines to get the width right - I think I'll hit the hardware store tomorrow.
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Online Scotaidh

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Re: F7U-3 Cutlass conversion
« Reply #8 on: April 08, 2018, 03:58:30 am »
This may or may not help, but it appeared in a number of US magazines some years ago.

Ladies, Gentlemen, and Whiffers, I present the F-7D Cutlass.




Is that a Tomcat nose?
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Offline rickshaw

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Re: F7U-3 Cutlass conversion
« Reply #9 on: April 08, 2018, 04:31:26 am »
This may or may not help, but it appeared in a number of US magazines some years ago.

Ladies, Gentlemen, and Whiffers, I present the F-7D Cutlass.




Is that a Tomcat nose?

Nope, too short.  I'd suggest it might be a Tomcat canopy though...
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Offline salt6

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Re: F7U-3 Cutlass conversion
« Reply #10 on: April 09, 2018, 11:59:14 am »
This may or may not help, but it appeared in a number of US magazines some years ago.

Ladies, Gentlemen, and Whiffers, I present the F-7D Cutlass.




Gorgeous.
Steve B


"The time has come,
         The Walrus said,
     To talk of many things:
Of shoes and ships
         and sealing wax
      Of cabbages and kings
And why the sea is boiling hot
      And whether pigs have wings."

Online Scotaidh

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Re: F7U-3 Cutlass conversion
« Reply #11 on: April 22, 2018, 03:14:06 am »

F7U-3 Cutlass - 004 I found some half-inch diameter tubular objects that could be made the correct length - party favour penny whistles. Not really the right sort of plastic, but as George Carlin once said, you can't have everything - where would you put it? ;-) Because the whistles are made of food-grade plastic, normal model glues just won't stick, so a mechanical joint was necessary to join the turkey feathers to the body of the engine. The inside rear end of the whistle needed to be enlarged to accept the square tubing - I could have used a drill, but the ream is quieter and slower - gives me more time to make mistakes ;-) - I mean, more control. The kit intakes were originally one piece, so needed to be cut to allow widening. The kit's 'intake fans' are too small, of course. I may drill them out or make new ones - that decision is pending.


F7U-3 Cutlass - 005 The new engines are 3" long minus the turkey feathers. You can see better, in this picture, how too-small the original intake fans are.
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Offline albeback

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Re: F7U-3 Cutlass conversion
« Reply #12 on: April 22, 2018, 03:35:58 am »
Love the idea. Just one small point though. The J-79 produced about 4 times the thrust of the J-34 engine!! A Cutlass so engined would be massively over powered would it not? How about a SINGLE J-79? Alternatively, the F-7/F-4 hybrid illustrated would seem to fit the bill just nicely!


Allan
« Last Edit: April 22, 2018, 03:37:45 am by albeback »
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Offline zenrat

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Re: F7U-3 Cutlass conversion
« Reply #13 on: April 22, 2018, 03:40:33 am »
Love the idea. Just one small point though. The J-79 produced about 4 times the thrust of the J-34 engine!! A Cutlass so engined would be massively over powered would it not? How about a SINGLE J-79? Alternatively, the F-7/F-4 hybrid illustrated would seem to fit the bill just nicely!


Allan

You say that like massively overpowered is a bad thing... :unsure:
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Offline albeback

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Re: F7U-3 Cutlass conversion
« Reply #14 on: April 22, 2018, 03:52:00 am »
 ;D Not a bit!! I like the idea!  In what if world, ANYTHING is possible!

Allan
Loves JMNs but could never eat a whole one!!