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Poll

Sadly, I am colour deficient, and useless at making decisions upon colour choices. What colour should the BSA be in your opinion? (I withold the right for my wife to veto any of your choices) :-)

Black with red upholstry
1 (12.5%)
Cream sides, green bonnet and boot with black upholstry
2 (25%)
Dogsc0#k red (sorry, apparently it is a thing so my decorator colleague says) and black
0 (0%)
British Racing Green + black upholstry
3 (37.5%)
Cream and navy upholstry
2 (25%)

Total Members Voted: 8

Author Topic: BSA 3 wheeler.  (Read 2860 times)

Jimr1999

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  • Location: Cumbria
BSA 3 wheeler.
« on: 18 Feb 22, 11:24 am »
Hello all,
It started getting a bit much for the technical section so, as I now intend to build, I thought I would move things into the right catagory.... So continuing on from my thread on "BSA 3 wheeler ideas for springs" on the technical forum, here we go.
My inspiration, without stealing a phot too blatently is here...
https://www.prewarcar.com/288973-bsa-three-wheeler

So far I have managed to CAD up rough a working front end with not too many obvious clashes of mechanics.
https://www.tinkercad.com/things/4Y7iKZgHcGn-fantabulous-krunk/edit?sharecode=y2tkrSQap2IaMf3w5WkV0dbn53ZLZsqAQxLggF6SLcM

And have just layed out the full size chassis, without detail on the rear end...

Next is to buy some bits. The painful part.
... You can lead a horse to water, but a pencil must be lead.

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Jimr1999

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  • Location: Cumbria
Re: BSA 3 wheeler.
« Reply #1 on: 22 Feb 22, 07:19 am »
Been playing around with the front uprights to connect to the springs. I know there can be issues with rose joints, but the design is fail safe as it is encapsulated and can be adapted to top hats if failure is an issue. It would allow a few degrees of KPI adjustment...
Work in progress, your thoughts please.
... You can lead a horse to water, but a pencil must be lead.

RhysN

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  • Location: Tamworth
Re: BSA 3 wheeler.
« Reply #2 on: 22 Feb 22, 07:57 am »
Very nice. The lawnmower racing guys use a very similar system with no issues, and are much more rough and tumble than us.
We must avoid torturing our brains with false problems, it occupies but it can annoy. In jest!

Jimr1999

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  • Posts: 298
  • Location: Cumbria
Re: BSA 3 wheeler.
« Reply #3 on: 25 Feb 22, 08:52 am »
Been buying this week. Wheels on the way, spindles and steering arms from Gemini, a few bits of ironmongry and a lead on an engine. Still got to locate a TAV. It seems like I am making a lot of it up on the hoof at the moment and I have been looking at the spring loadings on the front end...
Loadings at zero, 25kg and 50kg max deflection about 27mm
« Last Edit: 25 Feb 22, 09:09 am by Jimr1999 »
... You can lead a horse to water, but a pencil must be lead.

Jimr1999

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  • Posts: 298
  • Location: Cumbria
Re: BSA 3 wheeler.
« Reply #4 on: 27 Feb 22, 09:40 am »
I got the spindles and steering arms from Gemini yesterday and they look very sturdy. Impressive. I have been messing around with a monocoque timber chassis utilising a smaller rear pit bike wheel (14" with a wider tyre) as this will be near impossible to see when it is bodied. This will give me a little more engine room to play with - which is my next set of experiments. It should have the added bonus of a stiffer rear wheel that does not need such a large gear attached to it. Wheels arrive Monday  :)
Your comments welcome.

... You can lead a horse to water, but a pencil must be lead.

Jimr1999

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  • Posts: 298
  • Location: Cumbria
Re: BSA 3 wheeler.
« Reply #5 on: 04 Mar 22, 11:11 am »
Wheel day. I have all 3 now and after reading a few build journals and articles here I bought a 60 tooth sprocket for the rear. A total dinner plate of a thing and it has the correct PCD to mount to the 14" rear. With the tyre, the gearing would be equivalent to a 71/72 tooth sprocket on a 17" + 2 1/2" tyre wheel as my rear single wheel tyre will be a little fatter and wider than the fronts.
I hope this gives me a reasonable ratio and, as always I welcome your comments/ experiences.
... You can lead a horse to water, but a pencil must be lead.

Jimr1999

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  • Posts: 298
  • Location: Cumbria
Re: BSA 3 wheeler.
« Reply #6 on: 05 Mar 22, 05:06 pm »
What a beautiful day! I get to see you fellows on Zoom and five hours grinding metal in the sun. All in all a good one.
... You can lead a horse to water, but a pencil must be lead.

Jimr1999

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  • Posts: 298
  • Location: Cumbria
Re: BSA 3 wheeler.
« Reply #7 on: 06 Mar 22, 03:41 pm »
Well, the expensive bit might be on the wane now. Ordered a clone Honda Gx200 and a clone TAV. These might not be the highest quality items available "on't tinternet" but it is a start, and until proven, the whole concept should not be too powerful. More gloriously sunny grinding and fitting today.

Job one.
 Finish the front upright body ready for welding and make a foolproof jig for my friend the welder.

Job two.
 Make a chuck out of scrap wood to mount the big rear cog on my wood lathe to put a keyway in to match the key on the wheel face - An epic battle of high speed steel vs high carbon steel and willpower. all I can say is it worked. It might not have met health and safety requirements of a workplace, but I am not at work! (the alternative was to remove the key from the wheel with a grinder)

Job three.
 Emery a few thousandths off the spacers on the Gemini hub/spindles to make a polished sliding fit into the 16mm rose joints (see CAD image earlier in this thread)

Job four.
 Set out centres on carriers for drilling to accept rose joints set to a 6 degree caster.

Drink a beer in sunshine and draw spacers for turning.
Another good day.

« Last Edit: 06 Mar 22, 03:44 pm by Jimr1999 »
... You can lead a horse to water, but a pencil must be lead.

David F-R

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  • Location: South Yorkshire
Re: BSA 3 wheeler.
« Reply #8 on: 06 Mar 22, 06:18 pm »
Looking very neat Jim, and great progress for the day.

Remind me please - will it be front or rear engine?
I'm not quite as green as I'm cabbage sounding.

Jimr1999

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  • Posts: 298
  • Location: Cumbria
Re: BSA 3 wheeler.
« Reply #9 on: 06 Mar 22, 06:30 pm »
Looking very neat Jim, and great progress for the day.

Remind me please - will it be front or rear engine?
Rear, I think for a first shot at a cyclekart, the drive needs to be as simple as possible. I suppose it is actually mid engined  as I am trying to squeeze it in between the seat and the smaller rear wheel. The motor and TAV should be here mid. March and until then I can't finalise the chassis. Plenty to do until then. 😁
« Last Edit: 06 Mar 22, 06:31 pm by Jimr1999 »
... You can lead a horse to water, but a pencil must be lead.

David F-R

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  • Location: South Yorkshire
Re: BSA 3 wheeler.
« Reply #10 on: 07 Mar 22, 09:47 am »
I think you're very wise to go with the engine behind the seat. It keeps the drive system relatively simple. My kart (my first also and at the drawing stage) will be pretty much down the tried and tested line.
That said, in my dream world, a twice size Hoglet engine on the front of a Morganesque 3 wheeler would be an interesting challenge. It won't get beyond the dream world but still interesting. https://www.youtube.com/watch?v=Yzl2TUn3DeA
I'm not quite as green as I'm cabbage sounding.

Chris Brown

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Re: BSA 3 wheeler.
« Reply #11 on: 07 Mar 22, 09:55 am »
It's a pity there isn't a 200cc v twin available.  Having said that I've been wondering if a pair of the 99cc horizontal mower engines could be reworked and coupled together to make a v twin.

Chris

Jimr1999

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  • Location: Cumbria
Re: BSA 3 wheeler.
« Reply #12 on: 07 Mar 22, 12:09 pm »
The nearest thing in a honda lawnmower engine...
https://www.engine-specs.net/honda/gcv530.html
Just a tad more power than we should use :-)
... You can lead a horse to water, but a pencil must be lead.

David F-R

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  • Posts: 171
  • Location: South Yorkshire
Re: BSA 3 wheeler.
« Reply #13 on: 07 Mar 22, 02:28 pm »
If I get laid up again (just beginning to get a little better) I'll have a play with some drawings. Still can't figure out the the drive to the back wheel from a longitudinal shaft though.
It was just a thought/dream. (New thread if I pursue the idea.)

I shall not highjack your build thread any further, Jim. On with this excellent build and roll on next week's instalment.
I'm not quite as green as I'm cabbage sounding.

RhysN

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  • Posts: 974
  • Location: Tamworth
Re: BSA 3 wheeler.
« Reply #14 on: 07 Mar 22, 02:59 pm »
I know it's not BSA, but there were a fairly good number of single cylinder Morgans, especially for record breaking. As small as 250cc!
Have a look on the Cyclekart club forum US based one) for "thinking outside the box" for a shaft drive. Link later.
We must avoid torturing our brains with false problems, it occupies but it can annoy. In jest!