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Author Topic: CK 1 (ERA) build  (Read 14267 times)

ChrisS

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Steaming Ash
« Reply #30 on: 04 July 2019, 08:46:59 pm »
I was debating how to build my boat tail, I remembered I had some 5mm offcut strips of Ash and I thought I would have a go at making a frame.  I borrowed a wallpaper stripper from a friend and made a steambox from an old pipe. After steaming for an hour I carefully bent it round a jig and clamped it to cool and dry. I made a 2nd one and laminated them together, see pics.

Flushed with success I started on the 2nd frame, but on bending it snapped, perhaps the grain wasn't good. Anyway, I gave up and made the 2nd one in aluminium!

ChrisS

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Re: CK 1 (ERA) bending the bonnet
« Reply #31 on: 07 July 2019, 10:13:11 pm »
Here's a couple of pics, bending the bonnet using the 'ratchet strap' method!

StefanN

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Re: CK 1 (ERA) build
« Reply #32 on: 05 August 2019, 07:40:03 pm »
Any build photos/info Chris?  What's the top section of your tail made from?

ChrisS

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Re: CK 1 (ERA) build
« Reply #33 on: 05 August 2019, 09:03:11 pm »
Yes sorry guys! Here's a quick update:

I've been working on the tail section and it's been slow, but I'm almost there and I'm reasonably happy with it.

First I made an extension to the exhaust to exit at the rear. I've added a stay since pic was taken.


ChrisS

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Re: CK 1 (ERA) build
« Reply #34 on: 05 August 2019, 09:13:20 pm »
The tail top section is in glassfibre, not a material I am particularly familiar with.

Former [ Guests cannot view attachments ]

Glued in builders insulation, rubbed down, then covered with aluminium foil. [ Guests cannot view attachments ]

End result after laying up with resin and twill weave [ Guests cannot view attachments ]

Much filler later....... [ Guests cannot view attachments ]

Steve Cole

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Re: CK 1 (ERA) build
« Reply #35 on: 05 August 2019, 09:40:28 pm »
Hey... man that’s looking sweet 👍👍👍👍👍👍

StefanN

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Re: CK 1 (ERA) build
« Reply #36 on: 06 August 2019, 01:10:45 am »
Looking great Chris.  Is the new exhaust 25mm tube?  It looks bigger.

ChrisS

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Re: CK 1 (ERA) build
« Reply #37 on: 06 August 2019, 08:01:56 am »
Yes, I welded a spigot to the stock silencer and the extension is 25mm which fits over.

ChrisS

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Re: CK 1 (ERA) build
« Reply #38 on: 06 August 2019, 08:09:03 am »
I've added some ram air to the tail by way of a scoop located near the pull start in the hope that it will improve cold air supply to the fan, Who knows whether it will help, I'll find out when it gets a good thrashing!

Closed..... [ Guests cannot view attachments ]

Open...... [ Guests cannot view attachments ]

ChrisS

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Re: CK 1 (ERA) build
« Reply #39 on: 06 August 2019, 09:02:01 am »
My posts are like buses, when they come, they all come at once!  Here's another.........

After the weighing and tipping exercise, while I was at it I double checked my tracking which was set at 5mm of toe.

Wondering about the effect of suspension travel I loaded the front with 40kg, which created 14mm settlement, re-measuring the toe it had increased to 15mm. Quite surprised! But I guess it's down to the inclination on my track rods.

ChrisS

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Re: CK 1 (ERA) build
« Reply #40 on: 06 August 2019, 09:13:25 am »
I've started on the upholstery in my spare time! Pic shows progress so far - it's going to be a long job.

I need Tony to give me some schmoozing lessons!

StefanN

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Re: CK 1 (ERA) build - toe
« Reply #41 on: 06 August 2019, 06:34:56 pm »
After the weighing and tipping exercise, while I was at it I double checked my tracking which was set at 5mm of toe.

Wondering about the effect of suspension travel I loaded the front with 40kg, which created 14mm settlement, re-measuring the toe it had increased to 15mm. Quite surprised! But I guess it's down to the inclination on my track rods.
I've seen 1/8" and 5mm cited at common amounts of toe-in...but looking at photo's on CKC it looks like people are measuring in different places.  My understanding is that you measure between centres of the tyre (looking from the front or back) at the level of the axle.  5mm, in your case, is per side?  So if you measure the distance between the rears of the tyres and the fronts of the tyres when pointing straight ahead, the difference in measurements is 2 x 5mm?   Is that correct?  Probably needs a diagram.

ChrisS

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Re: CK 1 (ERA) build
« Reply #42 on: 06 August 2019, 07:11:54 pm »
Just to clarify, mine is 5mm overall, i.e. the distance between the 2 straight edges (see pic) is 5mm less measured at the front of the wheel, than when measured at the rear. But as noted above, a relatively small suspension travel changes this significantly. I guess that means i'll have bump steer?

StefanN

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Re: CK 1 (ERA) build
« Reply #43 on: 06 August 2019, 07:52:27 pm »
Funny enough, I just posted a chapter about this from the 1935 Autocar handbook on the Facebook Group and it talks about the bump steering issue.

« Last Edit: 17 September 2019, 07:23:18 am by StefanN »

ChrisS

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Re: CK 1 (ERA) build
« Reply #44 on: 25 October 2019, 04:53:42 pm »
Quick update guys:

I've moved my front axle rearwards to try and reduce the angle of the track rods, so it is no longer in the centre of the spring, can't test until Stretton, so could be interesting.

I've been maxing out on the straights so I've played around with the governor control setting which has increased it's cut in point from 3600 to 4000 rpm. That was on stands, hopefully it will have the power to pull it on the track!

I've also been finishing off odds & ends - aero screen, mirrors, fake exhaust, grille etc. 

See you Sunday!!