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TYPE 13 PETREL 1/4 SCALE

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Peter Balcombe
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Location: Clevedon, North Somerset, U.K.

Re: TYPE 13 PETREL 1/4 SCALE

Post by Peter Balcombe »

SedB wrote:
07 Feb 2020, 11:17
You build at the speed of light :o
Since I'm not an experienced builder, I learn a lot from this, so thanks for sharing!!

Looking great so far!
Seb,
Think time-lapse photography ;)
Last edited by Peter Balcombe on 07 Feb 2020, 21:33, edited 1 time in total.

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chris williams
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Location: Blandford Dorset

Re: TYPE 13 PETREL 1/4 SCALE

Post by chris williams »

Actually, there are hidden benefits to building at the speed of light...Thanks to Einstein's work on Time Dilation Theory, by the time this build is completed I will have aged only a few hours, whereas you lot will be many years older 8-)
(In fact, if I could just speed up a little more, I could finish the Petrel before I even started it)

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chris williams
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Re: TYPE 13 PETREL 1/4 SCALE

Post by chris williams »

On this version, I have included a de-bananariser for the tail end in the form of a 3mm lite ply template to sit between the spars and keep the tail end straight...

The filler for the nose needs to be applied in stages, 3 or 4 usually, otherwise gravity will cause bulges to form that will need extra elbow grease to remove...
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chris williams
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Re: TYPE 13 PETREL 1/4 SCALE

Post by chris williams »

Before much more can be done to the fuselage, the rear end needs to be sorted out. I have always found it best to set up the AMT as far as possible, before finally attaching the fin to the fuselage...
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chris williams
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Re: TYPE 13 PETREL 1/4 SCALE

Post by chris williams »

The AMT leading edges are made up from solid balsa, tapered and sanded to shape. The Fin is covered with 0.6mm ply, ready for setting up the AMT
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chris williams
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Re: TYPE 13 PETREL 1/4 SCALE

Post by chris williams »

For builders of the Petrel, the all-moving tail poses a bit of a dilemma... A quick bit of History: there were three Petrels built originally; one crashed, two remain. The best known of the two is Graham Saw's red Petrel, but here's the rub...Sometime during its history, the AMT was substituted with a conventional tailplane, that of a Rhonbussard if I remember correctly. I think most would agree that the AMT is a much more elegant shape than the substitute, so here we have a situation where even the iconic full size is not 'scale'. (The other 'scale' Petrel has been beautifully restored to it's original wood & varnish finish in the USA)
So, I make no apologies for using the original tailplane set up. I hope the diagram makes clear how it works: the tube in the fin hosts the AMT joiner bar, and the bellcrank rotates around the tube in the fin...
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Cliff Evans
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Re: TYPE 13 PETREL 1/4 SCALE

Post by Cliff Evans »

You could give the option on both tailplanes Chris. I know it is more work but.....

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chris williams
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Re: TYPE 13 PETREL 1/4 SCALE

Post by chris williams »

I can offer the drawing from my 3.5 scale version, scaled down, but I'm not building two fuselages...!
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Barry_Cole
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Re: TYPE 13 PETREL 1/4 SCALE

Post by Barry_Cole »

I can offer the drawing from my 3.5 scale version, scaled down, but I'm not building two fuselages...!

Go on, you know you want to....

8-) 8-) 8-) 8-)

BC

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Cliff Evans
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Re: TYPE 13 PETREL 1/4 SCALE

Post by Cliff Evans »

It would only take you 5 mins with your time machine!

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