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Old 01-29-09, 04:12 PM   #81 (permalink)
RamboLambo
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Re: Carbon GT mono

Urs. Great project. Just a question about making the a-arms.

Are they made in 2 halves first and then joined or somehow made in one peice? If they are made in 2 halves, how did you join them?
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Old 01-29-09, 04:42 PM   #82 (permalink)
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Re: Carbon GT mono

It would be not good to build them in 2 halfs .You have a to great delaminating chance.
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Old 01-29-09, 08:53 PM   #83 (permalink)
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Re: Carbon GT mono

Urs - you are using a core (like a foam) inside the layers of CF right? Or are the arms solid CF? You must be getting a great price on all that carbon....
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Old 01-30-09, 02:36 AM   #84 (permalink)
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Re: Carbon GT mono

yes they are fully filled with CF.
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Old 01-30-09, 05:33 PM   #85 (permalink)
RamboLambo
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Re: Carbon GT mono

Ahh I see how you are making the arms now. They are not a 2-peice moulding, just a single mould and the arms are totally flat on the bottom.
If they are filled with CF and resin, what is the weight of the arms then?
I would have thought with the amount of resin in the arms the weight would be very close to that of either a large diameter/thin wall tube or perhaps even a machined billet aluminium unit. Do you feel the small amount of weight versus layup time/overall strength is worth the effort?
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Old 02-01-09, 08:27 AM   #86 (permalink)
Urs
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Re: Carbon GT mono

hello rambo
you have also to think about ,what you have to pay for a carbon brake disk!! and you throw them away after some races or in bad case after one race.
the weight of one piece is 1,4kg and it s till oversized .It s no problem to build them in cro mo or alu,But we wanna try to build as much as we can in CF.
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Old 02-05-09, 02:45 PM   #87 (permalink)
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Re: Carbon GT mono

Looks great. Keep up the good work
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Old 03-30-09, 06:10 AM   #88 (permalink)
Urs
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Re: Carbon GT mono

Hello !
after a lot of work in our company,a nice ski holiday and correcting a stupid failure!! i took a new builded set of lower and upper a arms out of the molds
I have the bad feeling, that it will be not the only part that i build two or more times!!
here some pictures from the new arms.
this week i will laminate the arms of the right side and after it goes to fit them on the chassis.
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Old 04-03-09, 07:19 AM   #89 (permalink)
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Re: Carbon GT mono

Just found this thread now - Awesome build!

Keep up the good work and keep us updated!
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Old 04-10-09, 09:54 AM   #90 (permalink)
Urs
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Re: Carbon GT mono

now i drilled the holes in the chassis tu glue in the bearings for the suspension axles.
I mounted a wheel to see how it looks and it doesnt look bad.
here some pictures.
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Old 04-10-09, 10:11 AM   #91 (permalink)
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EGLITOM
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Re: Carbon GT mono

Hi Urs,

nice to see your progress. Is there any specific reason for mounting the Caliper in the front position. If not i would say you have the uprights of left and rights side interchanged.

Thanks
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Old 04-10-09, 11:12 AM   #92 (permalink)
Urs
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Re: Carbon GT mono

Hello Tom

You are right its not the right way ,they are mounted but was only fun to look how it would look ,in this case with the caliper on the other side.
My hands were faster than the brain!!
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Old 04-15-09, 10:50 AM   #93 (permalink)
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Re: Carbon GT mono

Urs, without reading the thread again... Were there any hard points built into the chassis during construction? Liek any aluminium spigot things where the suspension will load the chassis, or are you putting them in after, as per the photo above, to spread the load? i assume if you just mounted the wishbones direct to the carbon pick up points on the chassis, the carbon would just crack?
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Old 04-15-09, 01:56 PM   #94 (permalink)
Lynn Erickson
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Re: Carbon GT mono

Quote:
Originally Posted by Dom9 View Post
Urs, without reading the thread again... Were there any hard points built into the chassis during construction? Liek any aluminium spigot things where the suspension will load the chassis, or are you putting them in after, as per the photo above, to spread the load? i assume if you just mounted the wishbones direct to the carbon pick up points on the chassis, the carbon would just crack?
My entire aircraft is made of glass and carbon, no metal except the engine and bolts. the hard points are many layers of carbon the taper out into the structure. adding metal into a carbon structure is a bad idea and just aids in cracking. The metal and carbon do not flex the same and do not stay bonded well. The carbon will cause the metal to corrode through electrolysis. aluminum is the worst.
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Old 04-16-09, 03:00 AM   #95 (permalink)
Urs
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Merlin2222
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Re: Carbon GT mono

Quote:
Originally Posted by Dom9 View Post
Urs, without reading the thread again... Were there any hard points built into the chassis during construction? Liek any aluminium spigot things where the suspension will load the chassis, or are you putting them in after, as per the photo above, to spread the load? i assume if you just mounted the wishbones direct to the carbon pick up points on the chassis, the carbon would just crack?
We have glued in steel bearings(no problems with corrosion) which you see on the pictures.
To resist the cracking you have to arrange the layers in the right way ,and one of the most important things is ,that they not all end at the same place .It s difficult to discribe all the things.
For hard points where you bolt on some metal parts on the chassis,you have to cut out the foam ,and strengthen it with some cfk layers.
greetings from switzerland

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Old 04-16-09, 10:45 AM   #96 (permalink)
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Re: Carbon GT mono

Very cool. Are those the brakes you are using? What make are they?
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Old 05-04-09, 11:59 AM   #97 (permalink)
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Re: Carbon GT mono

Hi Urs........ I have been watching your build and its great stuff, I have a question. I see you have used alloy front uprights, Did you consider CF units or is it not practical or strong enough or did you just not consider it. I'm sought of thinking about it for the rear up rights??? what are your thoughts.
Cheers leon
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Old 05-05-09, 02:45 AM   #98 (permalink)
Urs
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Merlin2222
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Re: Carbon GT mono

@Jimbo
in front we have 6 pot wilwood and rear 4 pot wilwood.

@Leon
We have the front and rear uprights from RCR,It would be also possible,to build uprights also in carbon ,but we dont want to overdo things
maybe for ultra ultra light gt40.
greetings from switzerland
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Old 05-05-09, 06:11 AM   #99 (permalink)
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Re: Carbon GT mono

Thanks for the reply Urs... Great stuff!

I am really enjoying this thread!

Keep up the good work!
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Old 05-06-09, 05:49 PM   #100 (permalink)
Urs
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Re: Carbon GT mono

Here some new pictures .
I try to fit the linkage!!
Also a picture of our planes seats in the carbon mono,but the seats would need some changes!¨
And also a picture from our new two seater aerobatic trainer cockpit.
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