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Old Nov 02, 2014, 03:31 AM
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Ashford. Kent. England
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F7U Cutlass KF concept

I gave up looking for some profile or more scale like plans for a simpleF7U Cutlass ,
So have decided to make my own.. as a pusher prop jet , with either a simpler profile build or with a more built up body...
And using either aKFm2 or KFm4 wing..

first I scrounged for pictures and a couple of 3 view drawings
there turns out to be two main versions F7U-1 and F7U-3.. the 3 version being the most used, and my preferred shape
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Old Nov 02, 2014, 03:34 AM
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the sketchup trace over was made on the first 3 view found the F7U v1 1954 It has been modified and updated as I have progressed to show all the ideas
I am in process of refining the SU. sketchup file because Ive noticed a few other big shape changes on the F7u-3 version
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Old Nov 02, 2014, 03:35 AM
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now working on the alternative profile version F7U-3, which looks better just a year later 1955
obviously the drastic change in the nose shape was to give the pilot a better view for landings
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Old Nov 02, 2014, 03:35 AM
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now I have to decide how the build will be made...
the second profile shape , the F7U-3, is my favourite...
My only decision so far is to use a KFm4 wing as the base for the build..

I am leaning toward the prop in slot option.. because that makes getting the COG easier without having to put the battery right up the nose..
and thinking of building an box top deck fuz open at the front and back for airflow, for better looks
also thinking of trying linked ailerons to rudders for improved turns
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Old Nov 02, 2014, 04:03 AM
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going this way.. the previous sketchup file is updated as I progress..
the slot is 8" for a 7" prop .. cut to suit what you want to run...
Ive inserted some 6mmx1mmCF flat around the slot to reinforce that centre rear construction..
I havnt added wing spars, I am thinking of using pallet strapping if this wing needs strengthening

all the main components in a .pdf except for the decking.. you will need to refer to the updated sketchup file to sort out what goes where...lol
corrections will be noted as I go... on the pdf Ive forgotten to specify you need to make two tails, so the number of cut outs must be doubled
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Old Nov 02, 2014, 04:12 AM
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the profile below is a very good example.... and it looks great.. have you got a bottom view that shows the gear positions please...

It shows another good way to do the top of the fuz..
that's got me wondering if that method is best , its less draggy than a built up fuz
No matter because its your choice... either can be easily made, the top side shapes can be moved inward to sit on the fuz and doubled up to give them some more shape..

ive added some decking to the sketchup plans..., not updated as I am still modding the plans
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Old Nov 02, 2014, 05:53 AM
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found a few more pics for ideas and refining the shape
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Old Nov 02, 2014, 05:56 AM
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still refining the sketchup plans... there were other slight but noticeable changes between the two versions so these are being amended to go into the plans... I noticed that a bit late.. after finding the second 3 view set

both the sketchup file and pdf will need replacing to get a more accurate v3 shape
also working alternatives ...prop in slot and prop to rear
The basic shape is revised , now the individual parts need finalising for the pdf files ..ongoing
I will do one pdf for prop in slot and one for a rear motor setup

damn...I didnt save the sketchup file with all the extra work on it...
the pdfs are ok but the su file was an older one with a lot of faults...

any other sizes wanted and I can rescale the pdfs, and add a grid if that helps.. just post your wants
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Old Nov 02, 2014, 12:16 PM
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Monson,MA
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Looks good, one of my favorites , I built a cutlass foamy some years back , 26 " ws flies great, have not used a KF airfoil, I might have to build this one
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Last edited by Frank Rys; Nov 02, 2014 at 12:22 PM.
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Old Nov 02, 2014, 12:37 PM
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Great looking design...can't wait to see the finished product
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Old Nov 02, 2014, 01:46 PM
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Chile
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It's remarkable how futuristic look the shape of the '50 planes. .. some nose and fusr adjustment and will get a 6th generation fighter or something from Manga fightet design. ...
Your build looks awesome
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Old Nov 03, 2014, 12:14 PM
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Yes to me the thing still looks great.. better looking than some of the modern stuff..

This drawing is for a 30" span using 6mm foam
So any different thicknesses in foam will need slot sizes altered to suit..

Now what size do I want...
perhaps a micro version... using 3mm and a 10gm motor.... a 22" span will give 207sq".. This is a fair area for the 1811 motors from hobbyking and indoor flying..
The PDF's below are scaled down through sketchup to a 22" span..one then had a grid added, the grid I find useful for lining up the pages after printing..
printing is done through the latest free adobe reader, set on poster setting with a 0.25 overlap and the pages either in landscape or portrait for the lest paper used

don't forget the various cut outs for the KF layers will need adjusting if you alter the basic size when printing out... so cut the slots off last, double checking as you go after you cut any of the main parts...
that's likely the best option, I may have made some stupid mistakes...lol.. always check before cutting
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Old Nov 03, 2014, 12:22 PM
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reserved for the build
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Old Nov 03, 2014, 12:23 PM
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reserved
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Old Nov 04, 2014, 08:46 AM
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United Kingdom, Wrexham
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Very nice Dave, great work.
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