The De Havilland DH.101 Mosquito Hawk

[kitnut617]

I've been told that the Sabre Mk.VIII (not the one shown in Fury prototype photos which is a MK.VII) was specifically for a conta-prop but there's no photo of the set up.

Lumsden gives the designation Sabre E.118 for the three-speed, two-stage, contra-prop Sabre rather than Sabre VIII.
He also notes that, like the Sabre VIII, it was tested on the Folland Fo.108 43/37.

I had asked Tony Buttler about that because I wanted to find a photo of it so I could see how the exhaust arrangement was, but he said to talk to Phil Butler.  After an email to Phil, he told me he has just about every photo taken of the Fo.108 but there isn't one of this arrangement, at least not one that has been found yet.  It was Phil who told me that the Sabre Mk.VIII was a Mk.VII with the contra-prop PSRU.  But in anycase, these four engines (all having around 3000+ hp),  appear to be the only ones that have been describe as a three-speed two stage Sabre, the DH.101 supposedly getting the Sabre Mk.20SIM.  I've not been able to find anything about this particular mark though and what SIM stands for I've no idea.

[PR19_Kit]

 The best comparison would be the Westland Wyvern TF Mk.1 that's at Yeovilton because the engine in that is the closest you'll find to what was to be used in the DH.101.

Yes, that Eagle is one SOCKING great engine! It's a pity the FAA Museum don't normally display the Wyvern with the cowlings open as it would be a real mind blower. It makes a Griffon look like a kid's toy!

[kitnut617]

 The best comparison would be the Westland Wyvern TF Mk.1 that's at Yeovilton because the engine in that is the closest you'll find to what was to be used in the DH.101.

Yes, that Eagle is one SOCKING great engine! It's a pity the FAA Museum don't normally display the Wyvern with the cowlings open as it would be a real mind blower. It makes a Griffon look like a kid's toy!

When I went to the FAA Museum in 2001, they had one side exposed then

Here's a pic of a working 1/8 scale Eagle

[PR19_Kit]

A WORKING 1/8 scale Sea Eagle!

Strewth, that's amazing! Imagine all those 24 sleeve valves wizzing (I was going to say up and down.......) sideways. I bet the sound it made was incredible too, did he put it in a flying model?

[kitnut617]

Nope, I used to be a member of the AEHS (Aircraft Engine Historical Society) and there was a bunch of guys there who just built working scaled engines.  This was one of them

http://www.enginehistory.org/eagle_22.htm
http://www.enginehistory.org/

[R simmie]

Hello Kitnut,

thanks for the correction and info into the engine and CR.
looks like I will be buying up big next week at Hannants and other stores....
Concerning the wing I wonder if cutting up a 1/72 Mosquito wing and adding plastic
shims cord and lenghtwise would beef it up to 1/60th?
By the way what was the prop diameter on the Wyvern Mk1?

RS

[pyro-manic]

One cowling on the Wyvern was open the last couple of times i've been to Yeovilton. The starboard one IIRC. It is indeed a monster.

[kitnut617]

Concerning the wing I wonder if cutting up a 1/72 Mosquito wing and adding plastic
shims cord and lenghtwise would beef it up to 1/60th?

It would seem to me that chopping a Mosquito wing would be a lot of work RS, if you want to go that route I would use the Hampden wing as it's a bit bigger than what's needed.  Below is a pic of a 1/72 scale drawing next to a 1/60 scale drawing.  You can make your own mind up what would be easier.

By the way what was the prop diameter on the Wyvern Mk1?

12'-0", at least that's what the Aeroclub ones work out to. Plus the spinners are way too big.  I've got a couple of the TF Mk.I kits in the stash, only I can't find them at the moment but I pretty sure they measure out the same as the Python props

[kitnut617]

I'm going to build my wing from scratch, I've traced the drawing I have into AutoCad and come up with this so far, spars and ribs (see below).  I'm going to build it all in one without the nacelles on it, nor the radiators.  When I build the fuselage I'll cut a slot in each side and then slide the wing through.  Then I'll add the nacelles, then the radiators.

This is close to what ribs I'll put in but I might add a few extra.

[rickshaw]

What medium will you use?  Plasticard?

[kitnut617]

What medium will you use?  Plasticard?

Yup!   

[kitnut617]

It looks like I'll have to re-evaluate the wing chords because I've developed them correctly now.  Also I'll have to re-evaluate the Tempest fuselages too, I've just discovered that they will be too narrow if I glue them together as is.  They will need a 60 thou' card added to bring them out to the correct width.  I found out this because I was offering up various spinners to the profile and saw that the spinner is much bigger than a Tempest Mk.V spinner.  The new plan below shows what I mean.  I think though, the front spinner looks more like a Tempest Mk.II or Sea Fury spinner in shape.

It would seem then that the exhaust stubs could well be set inside the cowling profile much the same as the Wyvern TF.1 has them. Or at least something like how the MB5 has them (bottom pic)

[R simmie]

Hello Kitnut,

I was looking at a resin replacement for a 1/48 Spitfire mark IX spinner the other day and apart from being a little wider in the base compared to your older wing-cord drawing (I have not been able to check your new drawing),
it looks the right length. The shape may not be suitable though...The front part could be scribed to represent the
front spinner and  holes drilled in for the four props.

R Simmie

[kitnut617]

Lee (Wooksta) has kindly let me have some Tempest Mk.II spinners, which is my prefered route. But I've got a 1/48 Seafire Mk.47 handy, I'll have a look at it as it might be good for a back-up contingency

[kitnut617]

I missread your post but I've just had a look at the Mk.47 and you might be on to something there RS.  It's almost dead right on but you would only need the front spinner part plus a piece of 40 or 60 thou' card as it's just a tad short for what's needed.