• Administrator
  •  
    Before your membership becomes valid, you will receive an email that must be answered.
    Please check your spam folder or this email.
     

TYPE 13 PETREL 1/4 SCALE**

Let us all watch your new project progress.
User avatar
Peter Balcombe
Posts: 1399
Joined: 18 Mar 2015, 10:13
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.
User avatar
chris williams
Posts: 1549
Joined: 10 Mar 2015, 10:50
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)
User avatar
chris williams
Posts: 1549
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

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...
P1060259.JPG
P1060262.JPG
P1060263.JPG
User avatar
chris williams
Posts: 1549
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

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...
P1060260.JPG
P1060261.JPG
P1060264.JPG
User avatar
chris williams
Posts: 1549
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

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
P1060265.JPG
P1060266.JPG
P1060267.JPG
User avatar
chris williams
Posts: 1549
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

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...
P1060269.JPG
P1060270.JPG
P1060271.JPG
P1060272.JPG
Untitled-1.jpg
User avatar
Cliff Evans
Posts: 1032
Joined: 29 Dec 2019, 15:13
Location: Bristol
Contact:

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.....
https://lasercutsailplanes.co.uk
https://patteaklegliders.co.uk
User avatar
chris williams
Posts: 1549
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

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...!
Untitled-1.jpg
Barry_Cole

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
User avatar
Cliff Evans
Posts: 1032
Joined: 29 Dec 2019, 15:13
Location: Bristol
Contact:

Re: TYPE 13 PETREL 1/4 SCALE

Post by Cliff Evans »

It would only take you 5 mins with your time machine!
https://lasercutsailplanes.co.uk
https://patteaklegliders.co.uk
Post Reply