Grob 109 s

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roo Hawkins
Posts: 693
Joined: 18 Mar 2015, 20:12
Location: Northamptonshire

Grob 109 s

Post by roo Hawkins » 26 Nov 2018, 17:02

I have been looking at doing a grob for quite a while. After seeing that the old pj models kit has become available again on limited order. I was planning on ordering one but have decided to build a bigger one at 4.7 span and to fit a petrol engine. The pj one is 4.2 after speaking to Peter balcombe he as decided to order a pj kit so this may become a joint build thead when he gets his kit next week and finds time to start it. I started the plan last week and a week later it is glassed and I am now in the last stages of filling the fuz and the last bit of sanding . I will hopefully have it finished by next week. I will then start the wings. I will paint the fuz in the spring with my ash 31. How to build a fuselage in just over a week and lots faster than wood.
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Last edited by roo Hawkins on 26 Nov 2018, 19:31, edited 2 times in total.

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Peter Balcombe
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Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: Grob 109 s

Post by Peter Balcombe » 26 Nov 2018, 18:52

Well done Roo.
As you say, I have ordered one of the PJ Models 1/4 scale fuselage kits & plan to design a set of built up wings & tail feathers to make a 109B variant as used as the Vigilant T1 (recently axed as the RAF initial trainer).

I have heard of mutterings about PJ Models items in very old threads, but Catwok was happy with his recently acquired Chippie from the same stable. As Roo says, I hope to receive my fuselage parts this week, so will soon see.
I’m expecting to receive a fuselage set comprising a white gel coat fuselage & cowl, dash-panel, seats, wheel spats and canopy - all for £195.

At 1/4 scale, my model will have a span of 4.35m and is planned to be electric powered.

matt
Posts: 32
Joined: 18 Mar 2015, 08:25

Re: Grob 109 s

Post by matt » 27 Nov 2018, 07:58

Good morning Peter, I have also received a complete DHC-1 kit myself in the past few weeks. The fuselage is white gel goat and chop strand mat / polyester construction while the wings and tail plane are white foam with balsa sheeting. Overall very similar to a Pat Teakle kit and very reasonably priced.

Best regards, Matt

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Peter Balcombe
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Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: Grob 109 s

Post by Peter Balcombe » 27 Nov 2018, 13:54

My G109 fuselage kit arrived today & the contents are as expected & shown in the photo below.
As Mick says, the parts are probably in line with a Pat Teakle type short kit, so don't think high end German kits.
However, the quality of the parts is quite good for what you are paying - far less than European kits, and the parts look more than adequate.
If you want a super scale finish then you need to be prepared to cover the centre join lines etc & possibly paint the completed model, but I am more than happy with what I have.
Attachments
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Fuselage kit parts

Martin G
Posts: 45
Joined: 18 Mar 2015, 13:27
Location: North Wiltshire

Re: Grob 109 s

Post by Martin G » 27 Nov 2018, 15:38

Do PJ Models have a website?

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Cliff Evans
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Joined: 13 Mar 2015, 10:32
Location: Bristol
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Re: Grob 109 s

Post by Cliff Evans » 27 Nov 2018, 15:44

No, they don't!

catwok
Posts: 113
Joined: 24 Apr 2015, 12:15
Location: Rugeley

Re: Grob 109 s

Post by catwok » 27 Nov 2018, 18:11

Hi chaps, I've got to know Pete quite well over the past few months through a mutual friend. He has asked me if I would do some low key advertising for his kits. As you have seen from previous posts, he is doing a Grob 109, 1/4 scale Chipmunk and a 1/4 scale ASK 18. All follow the same construction method.

If you would like anymore details or want to order anything, please PM me or call me on 07771 856362.

Paul

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Peter Balcombe
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Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: Grob 109 s

Post by Peter Balcombe » 29 Nov 2018, 21:37

Comparing various measurements of the PJ Models fuselage with a couple of scaled 3-view drawings taken from the Internet (not necessarily accurate in themselves) indicates that although the fuselage is pretty close to 1/4 scale in its major dimensions, the wing root chord appears to have been ‘stretched’.
I would imagine that this has been done to give a lower wing loading as the model is said to have good flying characteristics.
The root section is something close to E207 and the full kit had I think a span of 170” (4.3m) which is just over 1/4 scale for the shorter span G109A (16.6m span).

I have scaled up the G109B variant (17.4m span) wing planform for the fuselage root chord, which gives a span of 4.8m. The alternative is to use the wider root chord with a 1/4 scale span (4.35m) :?

The target flying weight of the PJ Models kit is 14-16.5lbs, so I guess I’m going to need 1500w or so of urge from an electric power setup to RoG. Looks like a 8-10S LiPo pack to keep the current sensible.

roo Hawkins
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Joined: 18 Mar 2015, 20:12
Location: Northamptonshire

Re: Grob 109 s

Post by roo Hawkins » 30 Nov 2018, 15:08

After talking to Peter my fuz has been worked out at just under 1/3 scale. This is because of using a bad 3 view so this is now going to be a big model at more than 5 meters.

roo Hawkins
Posts: 693
Joined: 18 Mar 2015, 20:12
Location: Northamptonshire

Re: Grob 109 s

Post by roo Hawkins » 01 Dec 2018, 16:46

Primer filler finished. Using a new product upol reface. Whould not go through the spray gun. So I had to brush it on and sand. .also did the ash 31 as well.
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