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Thread: The Return....................Fingertight Sidecar MkII

  1. #1
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    The Return....................Fingertight Sidecar MkII

    Four years ago to the day the Fingertight Racing Sidecar division was created.

    Read all about here if you need reminding about how it started, and then ended.

    What is this post all about? Well it has been quiet on here lately, so watch this space.........

    For the record Qkkid was in my bed, not the other way round

    Quote Originally Posted by Yow Ling View Post
    Pumba is a wise man.

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    do we need to watch out for front ends littering circuits again

  3. #3
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    That engine with the torn off clutch bracket is still sitting on the shelf, having said that I think (hope, because otherwise I have no idea) I have killed another crank.
    Stock is best

  4. #4
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    Having technical difficulties with posting photos, so let's see if this works.








    For the record Qkkid was in my bed, not the other way round

    Quote Originally Posted by Yow Ling View Post
    Pumba is a wise man.

  5. #5
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    Quote Originally Posted by Henk View Post
    I have killed another crank.
    Fuck your hard on gear

    For the record Qkkid was in my bed, not the other way round

    Quote Originally Posted by Yow Ling View Post
    Pumba is a wise man.

  6. #6
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    Quote Originally Posted by Pumba View Post
    Fuck your hard on gear
    Not sure yet, I might still have a phantom intermittent electrical problem. Won't know until two hour practice. On the other hand Craig is coming round tomorrow to weld up my frame AGAIN.
    Stock is best

  7. #7
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    How come you've stuck the motor up front?

  8. #8
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    Quote Originally Posted by Drew View Post
    How come you've stuck the motor up front?
    You know I battled with that decision for quite a while. There a technical advantages and disadvantages in terms of fabrication with both options, but in the end my only justification is because I wanted to.

    Some weird desire to be different I guess.

    For the record Qkkid was in my bed, not the other way round

    Quote Originally Posted by Yow Ling View Post
    Pumba is a wise man.

  9. #9
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    Quote Originally Posted by Pumba View Post
    You know I battled with that decision for quite a while. There a technical advantages and disadvantages in terms of fabrication with both options, but in the end my only justification is because I wanted to.

    Some weird desire to be different I guess.
    Fair enough.

    What holds the steering post all the way up there?

  10. #10
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    Quote Originally Posted by Drew View Post
    Fair enough.

    What holds the steering post all the way up there?
    Just using the top engine mount at the moment. Plan to put a brace in but need to get some lighter material.

    For the record Qkkid was in my bed, not the other way round

    Quote Originally Posted by Yow Ling View Post
    Pumba is a wise man.

  11. #11
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    Quote Originally Posted by Pumba View Post
    Just using the top engine mount at the moment. Plan to put a brace in but need to get some lighter material.
    Does that drive chain run right next to your left testicle.
    PS loved the first version.



    Kinky is using a feather. Perverted is using the whole chicken

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    nice work pumba , are front engine went well until it hit a curve in 2001
    i'm over buckets

  13. #13
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    Quote Originally Posted by husaberg View Post
    Does that drive chain run right next to your left testicle.
    PS loved the first version.
    The things I have to do to get my testicals touched now days!

    For the record Qkkid was in my bed, not the other way round

    Quote Originally Posted by Yow Ling View Post
    Pumba is a wise man.

  14. #14
    Quote Originally Posted by Pumba View Post
    Having technical difficulties with posting photos, so let's see if this works.
    Nice going.

    First off: congrats on the use of RHS. Perfect material for the job here - nice and simple.
    The overall layout looks really good as well.

    I am very worried about that front end though. Having the steering axis so far from the centre of the contact patch will make it pull hard right under brakes - like really hard.
    I have done some quick math on this for you, and I estimate that under brakes you will have to apply 70kg of extra force on your right hand than on your left to stop it turning. I would look at getting that steering axis as close as you can to centred in the tyre, but that is pretty difficult with kart wheels unless you go to a more conventional setup. The numbers I used for this are attached as an image.

    If it were me I would also move that front wheel back towards the engine to shorten the whole lot up - but that is pretty unfounded, really just my musings about what makes a sidecar fast around a short track.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  15. #15
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    Quote Originally Posted by Moooools View Post
    Nice going.

    First off: congrats on the use of RHS. Perfect material for the job here - nice and simple.
    The overall layout looks really good as well.

    I am very worried about that front end though. Having the steering axis so far from the centre of the contact patch will make it pull hard right under brakes - like really hard.
    I have done some quick math on this for you, and I estimate that under brakes you will have to apply 70kg of extra force on your right hand than on your left to stop it turning. I would look at getting that steering axis as close as you can to centred in the tyre, but that is pretty difficult with kart wheels unless you go to a more conventional setup. The numbers I used for this are attached as an image.

    If it were me I would also move that front wheel back towards the engine to shorten the whole lot up - but that is pretty unfounded, really just my musings about what makes a sidecar fast around a short track.
    I think Mools is correct. On a go kart where you have a wheel on both front corners it is OK. With yours it will lift turning one way and drop going the other. I have not looked at side car setups but as yours is now will want to turn left all the time. The center of the Tyre contact should the line where the steering pivot meets the contact patch of the Tyre to the road. Good looking effort though. Do they work any good with a motorbike fork set up with very little caster or rake?

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