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Author Topic: New build start..GN Thunderbug.  (Read 4643 times)

RhysN

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Re: New build start..GN Thunderbug.
« Reply #15 on: 02 June 2019, 07:19:35 am »
Unless you have the chain running directly back from about a 4 o'clock mounting you have to, at least, massage ribs. These units were originally made for mini bikes and designed that way.
Don't worry about taking off ribs, I have heard of nobody having issues as a result.

Adrian

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Re: New build start..GN Thunderbug.
« Reply #16 on: 02 June 2019, 12:24:25 pm »
I am in precisely the same qundry.
Is it OK to remove the stiffening ribs  on the crankcase?
Adrian

RhysN

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Re: New build start..GN Thunderbug.
« Reply #17 on: 02 June 2019, 05:58:09 pm »
I would not touch the crankcase, some castings are very thin. The TAV can handle it.
Sorry to hear about you being a new member of the "Some bast$%^ stole my welder club" Adrian.

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #18 on: 05 June 2019, 10:10:19 pm »
Inspiration!  Really fancy building it fun size!

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #19 on: 11 June 2019, 08:00:40 pm »
Been working on the front axle...nearly finished. I’ve put a rack on it ( bought before the recent discussions on the forum !)
Also working on a V twin engine. It’s got to look realistic, BSA bantam cyl. Heads, scooter barrels and plastic drainage pipe for the main barrel. Got some small carbs as well!

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #20 on: 13 June 2019, 11:10:11 am »
Chassis works continue....the stick welding is not producing a pretty picture!

Chris Brown

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Re: New build start..GN Thunderbug.
« Reply #21 on: 13 June 2019, 12:21:07 pm »
To follow on from your question on Stefan's post regarding your radiator cowling.

There are an number of ways to tackle it:

Find something the right basic shape and trim it to suit, sink, water tank plastic trough.

Find something you can use as a mould, baby bath or similar.

Sculpt it in foam as Stefan has, mould the body shape over that, fill, sand and paint the outside to get the finish you want.

I'm going to try using the chrome car wrap on the Morgan radiator surround.

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #22 on: 13 June 2019, 01:51:07 pm »
Thanks Chris...I kinda like the foam/glass mat/ filler route. I can sit and sand it whilst watching the telly !!

Chris Brown

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Re: New build start..GN Thunderbug.
« Reply #23 on: 13 June 2019, 02:02:13 pm »
If you go down that route then wait until it has gelled (just gone rubbery), and apply a glazing coat. You can buy glazing coat resin, or just make it up from 1 part laminating resin, 3 parts gelcoat, that'll make finishing a lot easier.

Steve Cole

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Re: New build start..GN Thunderbug.
« Reply #24 on: 15 June 2019, 08:52:04 am »
I would not suggest making up a “Glazing coat” !
fibreglass your piece, let it set then screed it with an easy sand car bodyfiller.
Then sand it down when it’s set. Anything gelcoat or resin with be much harder to sand down
This kind of stuff is what you want to use
« Last Edit: 15 June 2019, 09:22:42 am by Steve Cole »

Chris Brown

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Re: New build start..GN Thunderbug.
« Reply #25 on: 15 June 2019, 09:20:52 pm »
As I use it the glazing coat simply gives a smoother base for the filler, and reduces the amount of sanding needed, it's not a final coat. I should have made that clear in my comment, sanding goes down to the glazing coat not into it. I usually pigment the glazing coat black to give a teltale when you reach it, it also means you don't sand into the glass.

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #26 on: 19 June 2019, 01:15:37 pm »
My friend David, “techskill” on the forum, has taken on the grill for me! David was with me at Stretton last month.

RhysN

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Re: New build start..GN Thunderbug.
« Reply #27 on: 19 June 2019, 02:36:09 pm »
What grill(e) :) ?

BTWmy friendly sign guy has the artwork for the GN logo as on Thunderbug. Yell out if you want a pair of red ones. You need to figure the size.
« Last Edit: 19 June 2019, 02:40:18 pm by RhysN »

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #28 on: 22 June 2019, 07:56:48 am »
Progress on the build. David has spent two days carving out the grill shell in wood! It’s far too good to cover up so will just paint it.
Engine block is made and will start assembling the rest of the engine today.
Have bought an old kart seat and have widened it to suit me!
Starting to cut up plywood and think about getting in and out of the thing! It’s going to have to be sturdy around the seat area.

RhysN

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Re: New build start..GN Thunderbug.
« Reply #29 on: 22 June 2019, 08:21:09 am »
That's looking really good. Love the rad shell, and you are right, matt silver paint. It's a bit too nice for Thunderbug, looks more like a show piece :)