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Author Topic: AL William's Gulfhawk, The Peerless Model Airplane Company Build  (Read 812 times)
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dieterperiperi
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« on: June 05, 2017, 02:18:23 PM »

Ive had this plan printed for a few weeks now and have cut most of the formers already. Very windy conditions in Hertforshire, England means no flying so I have to occupy my time otherwise now and might as well start this. This will be my first biplane Ive built...

Wingspan will be 11" and 9/16

I will do my best.......to be patient
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AL William's Gulfhawk, The Peerless Model Airplane Company Build
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dieterperiperi
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« Reply #1 on: June 05, 2017, 05:35:41 PM »

3 hours into the build and all good so far. Using my Edward Preston to keep things square has come in usefull. Seen some other builds where magnets, dead square metal blocks are being used to keeps things in place and have to say that I'm coming round to the idea.

All 1/16 strip medium strip with the former from 1/16 sheet light

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Glenn (gravitywell) Reach
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« Reply #2 on: June 05, 2017, 09:33:19 PM »

I've looked at that plan many times!  I'll be watching with interest. Smiley
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Glenn Reach
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« Reply #3 on: June 08, 2017, 03:15:06 AM »

Years ago Crabby made printed tissue for that kit. He may still have the file.

Accurate Miniatures made a plastic kit in 1/48 scale.

Monogram made a plastic kit in 1/32 scale but I believe it was their F3F kit with a different cowl. I think the Gulfhawk was an F3F fuselage with F2F wings and a larger engine.

I have scans of the decals from both plastic kits.

From what I have read that must have been a superb aerobatic airplane.
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dieterperiperi
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« Reply #4 on: June 14, 2017, 05:42:33 PM »

So heres an update so far -
wings and stabs build and sanded
Still pondering the cowl section and decided to build the lower wing as one section to give some strenth and make it easier for myself 
 she's definitely taking shape now
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gossie
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« Reply #5 on: June 14, 2017, 08:50:38 PM »

I guess most are aware Gulfhawk is in DC at the Smithsonian.
I saw it some years ago, and very pretty in orange.
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dieterperiperi
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« Reply #6 on: June 15, 2017, 01:16:59 AM »

and very pretty in orange.

Im definitely covering in orange, unfortunately not as vibrant as the one in DC
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Don McLellan
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« Reply #7 on: June 15, 2017, 11:39:11 PM »

Hi Dieter,

If you use orange Esaki to cover, a little orange or maybe red chalk on the under side may brighten the orange color.  It will add some weight however.
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dieterperiperi
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« Reply #8 on: June 16, 2017, 10:47:50 AM »

If you use orange Esaki to cover, a little orange or maybe red chalk on the under side may brighten the orange color.  It will add some weight however.

I will be using Esaki Don. And just found a "how to" on internet.

Definitely gonna try this. Thanks
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dieterperiperi
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« Reply #9 on: June 17, 2017, 10:34:28 AM »

Ok, so Im not realy a stickler for detail but thought I should make some efford to tart my Gulfhawk up a bit.

Im going to attemt make the front, more prominent engine cover/cowl and incorperate a sturdy prop mount. I have had some 2mm ply and brass tube delivered and looked at a few designs. Its going to add a bit of weight, about 2grams but then ive always had to add clay to most other models (tail ends to heavy??) the ply will be used for the mount only with cowl made from 0.8mm and 3/16 sheet.

As per gossie's post about the real thing at the Smithsonian- I looked at some online images and saw it kitted with a tri-blade prop which I will attempt to make.

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dieterperiperi
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« Reply #10 on: June 19, 2017, 04:53:01 AM »

Pinned the cowl in place to see what it would look like. I think this will work. But realised that I should covered the nose first before starting this. Will have to add little section now behind the cowl to take the covering.
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Crabby
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« Reply #11 on: June 19, 2017, 10:11:42 AM »

HA HA I seem to perform that little feat every time I do a radial. I have had long talks to the mirror over this repetition!
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dieterperiperi
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« Reply #12 on: June 20, 2017, 05:48:15 PM »

Decided tonight that I will remove the narrow section radial that was to support the cowl and build the cowl seperatly and hope it fits. The 0.8mm sheet if quite flexible so should be able to manipulate it somewhat when pushing the cowl on. This bit is taking up a lot of time. But will hopefully be worth it.

Every part is now nicely sanded down and I daren't sand the fuselage any more for fear of disintigration Undecided

I will have to study some covering methods for the wings. They are a little flimsy and I have had a couple of bad experiences with warping wings when covering. I almost alway wet cover as it gives a realy nice smooth finish, but suppose this also tightens the tissue so much that its likely to misshape parts.   
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dieterperiperi
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« Reply #13 on: June 22, 2017, 05:43:03 PM »

Hi all
So, the cowl photo in the previous post turned out to be a practice one. It came out the wrong shape yet nicely round and not a bad effort. On the Peerless plan show the cowl tapered at the top and bottom and square on the sides. I thought that I could manipulate it a bit but found the 0.8 sheet surprisingly sturdy when glued into that cylidrical shape. And had another idea in my head by this time already. I also wanted to correct the shape of the front after studying some Gulfhawk photos.

So my other other idea was to make some kind of mould to wrap the thin sheet on and get a better shape. I found some celotex (Kingspan) polistyrene type insulation, which has a very fine make up, yet solid to handle. It sands very easily (and messy) so brought it home this evening and got to work. Glued a cube onto a smaller square piece of ply with dowel in it, mounted it onto my cordless drill and got sanding. This worked really well and had it sanded to a tapered shape in no time.

I cut it of the ply mount with a hacksaw blade and flattened off the sides to the shape i wanted. I the planted the first flat/round front cowl section onto the mould and proceeded to glue the thin sheet on keeping it tight to mould.

Removing the mould from inside was a delicate process not to break the thin sheet and had to do some repairs never the less. Added the second (front of cowl) section and did some sanding.

Im am very pleased with the outcome and think this celotex stuff has lots of potential for future use (even thought of making a whole fusage with no formers could possibly be done)

I will have to do some adjusting to cowl when finally gluing it to the fuselage, but doing things this way around will be way easier.
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