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#Post#: 10446--------------------------------------------------
Hanomag 2/10
By: Jagodo Date: February 20, 2024, 2:01 pm
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I wanted to find something that was a bit different for my
inspiration car and I chanced upon the 1924 Hanomag 2/10. This
very small car had a single cylinder 503cc water cooled engine
mounted transversely in front of the rear wheels. I had no front
brakes and just the one brake on the solid rear axle - no
differential! They made about 16,000 of them with various 2
seater designs - either open soft top or a very boxy saloon. The
road car had a top speed of 40mph and did 80 mpg. The mid-engine
layout did away with the prop shaft and allowed the floor to be
much closer to the ground. The front suspension used two
transverse leaf springs to form the 'wishbones' of its
independent front suspension. The rear suspension was by
trailing arms. In many ways it was an innovative design and it
heavily influenced Ferdinand Porsche when he designed the
Beetle.
Someone at the factory had the bright idea of making a racing
car that was little more than a bare chassis. Three of them were
entered in the 1927 Nurburgring and they finished 1st, 2nd and
3rd in their class despite having a top speed of about 60 mph in
racing form (yes, they were the only cars in their class). Those
racing cars were still two seaters. Other people modified the
chassis to make single seaters, some of which had bodywork made
of willow basket work!
I was hoping to make an electric cyclekart with a compact
lithium battery pack hidden under the seat and with the motor
concealed inside the crackcase of a mock engine but the huge
cost and considerable technical risk of an electric drive
system, coupled with the logistics of charging etc, pursuaded me
to go down the conventional 'Honda' route. My plan is to make
bodywork that encloses the engine bay but with the rest of the
bodywork modelled on this car.
There is not a lot of scaling to do as the real car wheelbase
was 1920mm and I am planning a cyclekart wheelbase of 1700mm to
fit everything in. One difficulty with scaling is that in the
real car the driver took all of the space from the seat forward,
so all of the cyclekart shrinkage will need to be rearwards of
the seat, changing the proportions a little. The real racing car
width pretty much fits with the cyclekart formula so there isn't
much reduction needed - a narrower body would be a little
lighter but I don't think it would look right.
The greatest challenge is the front suspension. Getting the
springs the right shape and the correct stiffness looks
troublesome. If the suspension is too soft then there would be
considerable bump steer, plus all of the parts would be bespoke.
Alternatively, a straight beam axle similar to an Austin 7 with
a transverse leaf spring might look similar and be much less
risky. Is that sort of change within the spirit of cyclekarting?
#Post#: 10447--------------------------------------------------
Re: Hanomag 2/10
By: NewbieNick Date: February 20, 2024, 11:46 pm
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Hi Jagodo, what a fantastic little car. I wouldn’t worry about
suspension design to much we are not making replicas.
Cheers Nick
#Post#: 10448--------------------------------------------------
Re: Hanomag 2/10
By: RhysN Date: February 21, 2024, 5:04 am
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Are you planning on going down the wooden wheel route for this?
Have a look at my thread on the Gordon Bennet Napier build.
#Post#: 10457--------------------------------------------------
Re: Hanomag 2/10
By: Jagodo Date: February 21, 2024, 3:15 pm
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Hi RhysN, I hadn't seriously considered making my own wheels
because I couldn't see how I would make durable rims. But
looking more closely, it seems that the original wheels actually
marry wooden spokes with steel rims. I expect that I'll go with
normal pit bike wheels initially as I feel that I must pace
myself with my first cyclekart.
#Post#: 10459--------------------------------------------------
Re: Hanomag 2/10
By: RhysN Date: February 21, 2024, 3:21 pm
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I always suggest your first build should be simple (I am not
allowed to say remember KISS principle here, even though
everybody I know takes the meaning as Keep It Simple Simon). Get
out there with a simple build and enjoy, then complicate to your
hearts content later.
#Post#: 10463--------------------------------------------------
Re: Hanomag 2/10
By: thamesmud Date: February 22, 2024, 4:59 am
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Hi,
I'm looking to build an Edwardian type with artillery wheels
[attach=1]
and have asked the committee to consider if these Yamaha YBR 125
Custom wheels might be allowed.
[attach=2].
These are 18 inch x 1.85 inch so the width is within the rules
and there is a dispensation for Edwardian cars to run 18 inch
wheels so I'm quite hopeful.
Like you I don't feel confident to make wooden wheels from
scratch. The rear wheels from this bike are 16 inch and the
rims are too wide so I did wonder if it might be possible to
turn off the 16 inch wheel rim and bolt on a steel 17 inch rim
from a Honda. My lathe won't swing 8 inches so it would mean
bodging up a way of turning the wheel horizontally on its
bearings whilst running a tool in.
#Post#: 10464--------------------------------------------------
Re: Hanomag 2/10
By: Jagodo Date: February 22, 2024, 6:00 am
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I like those Suzuki wheels. From the picture, it looks like they
have 5 threaded holes to take a disc brake but those could serve
as mountings or to transmit the drive if you put them on the
back. I might not be able to use them as my inspiration car is
1924, so it isn't actually Edwardian - I think the Hanomag was
behind the times in the wheel choice even though it was ground
breaking in other ways.
#Post#: 10465--------------------------------------------------
Re: Hanomag 2/10
By: RhysN Date: February 22, 2024, 6:07 am
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For me Edwardian is "of the type" rather than strictly when
Teddy was on the throne. Just a personal view. Let's face it,
many of the cars being built here in the UK are more "small
cars" than the real definition of a cyclekart.
I went with a method of making wheels which is well proven by my
friends in the US who have been thrashing them round for 3 years
now.
I too have asked for a dispensation the rear rim width, the last
2 comstar rims I could find are 2.15. I will be using the same
size tyre on all 4 wheels. So far no response to my request
though.
#Post#: 10466--------------------------------------------------
Re: Hanomag 2/10
By: thamesmud Date: February 22, 2024, 9:28 am
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[quote author=Jagodo link=topic=1363.msg10464#msg10464
date=1708603219]
....5 threaded holes to take a disc brake but those could serve
as mountings or to transmit the drive if you put them on the
back.
[/quote]
That is the plan, only I was going to fit studs in the tapped
holes and mount the keyed drive flange on the outside at the
rear and finish off with a dummy hub with a centre hex fixed
with dome nuts onto the studs. Should look a lot like
[attach=1]
when it's done.
#Post#: 10468--------------------------------------------------
Re: Hanomag 2/10
By: Jagodo Date: February 22, 2024, 11:29 am
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[quote author=Jagodo link=topic=1363.msg10464#msg10464
date=1708603219]
I like those Suzuki wheels.
[/quote]
Doh! I meant Yamaha. Stupid Boy!
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