Group C replica Mazda 787B
Discussion
I assume you are aware of the Mulsannes Corner website?
http://www.mulsannescorner.com/RX-792P.html
Lots of info on there about loads of Group C cars...
http://www.mulsannescorner.com/RX-792P.html
Lots of info on there about loads of Group C cars...
Hi Rob,
Great project, I had considered replicating the 787B myself for my project (scratch built mid rotary-engined thing) but was put off by the ground clearance/overhangs and highlight problems as mentioned previously- plus I decided a roof/doors/windows was going to be too much work.
I must say though, I really cannot beleive you would even consider doing a 787B without a rotary engine- this is what the car is famous for. I understand I'm not going to change your mind- you've already bought your Audi engine, but this really is verging on sacrilege!!!!
One other point, not meaning to be an arse but 6082 T6 (mentioned using for uprights)is not Aircraft grade- its general engineering grade same as HE30- only mentioned it in case any of you calcs were based on higher strength alloys.
All the best with the project though, its looking really good.
Cheers
Rob
Great project, I had considered replicating the 787B myself for my project (scratch built mid rotary-engined thing) but was put off by the ground clearance/overhangs and highlight problems as mentioned previously- plus I decided a roof/doors/windows was going to be too much work.
I must say though, I really cannot beleive you would even consider doing a 787B without a rotary engine- this is what the car is famous for. I understand I'm not going to change your mind- you've already bought your Audi engine, but this really is verging on sacrilege!!!!
One other point, not meaning to be an arse but 6082 T6 (mentioned using for uprights)is not Aircraft grade- its general engineering grade same as HE30- only mentioned it in case any of you calcs were based on higher strength alloys.
All the best with the project though, its looking really good.
Cheers
Rob
Dom9 -
Yeah thanks for the heads up on the Mulsanne Corner website. I have visited it many many times before!
Nasty-bob -
I've covered the few points you've made already but basically the car will be modelled on a 787B but may well be tweaked slightly (clearances etc..) in order to meet IVA requirements. Also, the Audi engine is in the car at the mo as a cheap and reliable powerplant (360bhp in standard form) that I will use in testing. Ultimately, a rotary engine is going in.
I am fully aware of the different grades of aluminium. I suppose to say that something is aircraft grade is kind of pointless anyway, seeing as some grades used on an aircraft are not all that special at all. Even so, the mechanical properties of 6082 T6 match if not exceed 6061 T6 which is a known aircraft grade. I was just trying to indicate that I am using a specific engineering alloy with good mechanical properties suitable for a component such as the upright. I have worked carefully using the material suppliers information in carrying out my load, stress and fatigue calculations using industry standard FOS. Thanks for your interest and input though.. Thanks, Rob
Yeah thanks for the heads up on the Mulsanne Corner website. I have visited it many many times before!
Nasty-bob -
I've covered the few points you've made already but basically the car will be modelled on a 787B but may well be tweaked slightly (clearances etc..) in order to meet IVA requirements. Also, the Audi engine is in the car at the mo as a cheap and reliable powerplant (360bhp in standard form) that I will use in testing. Ultimately, a rotary engine is going in.
I am fully aware of the different grades of aluminium. I suppose to say that something is aircraft grade is kind of pointless anyway, seeing as some grades used on an aircraft are not all that special at all. Even so, the mechanical properties of 6082 T6 match if not exceed 6061 T6 which is a known aircraft grade. I was just trying to indicate that I am using a specific engineering alloy with good mechanical properties suitable for a component such as the upright. I have worked carefully using the material suppliers information in carrying out my load, stress and fatigue calculations using industry standard FOS. Thanks for your interest and input though.. Thanks, Rob
For anyone that is interested, this is where I really started my love of designing race-orientated cars : http://www.formulastudent.com/
I was part of the Imperial College London team from 2005 to 2006. It is where a lot of innovative new designs and techniques originate. In 2005 one of the guys on our team produced a set of carbon fibre composite wheels. Even had Ross Brawn jealous as he browsed the pits as they are not allowed to use them in F1!
I was part of the Imperial College London team from 2005 to 2006. It is where a lot of innovative new designs and techniques originate. In 2005 one of the guys on our team produced a set of carbon fibre composite wheels. Even had Ross Brawn jealous as he browsed the pits as they are not allowed to use them in F1!
Edited by RobBiggs on Monday 1st February 19:35
Hi Chris,
My aim at this stage is to put together a car with only the bare essentials necessary to make it run and drive. I will then run this first prototype making any modifications to the design as I go along. I can also get people's feedback on what they would like to see incorprated or changed in order that the second prototype would be almost identical to one that I could sell. So yes my intentions are to make more than one vehicle. Timescales are going to be very dependent on how much interest there is..
Cheers
Rob
My aim at this stage is to put together a car with only the bare essentials necessary to make it run and drive. I will then run this first prototype making any modifications to the design as I go along. I can also get people's feedback on what they would like to see incorprated or changed in order that the second prototype would be almost identical to one that I could sell. So yes my intentions are to make more than one vehicle. Timescales are going to be very dependent on how much interest there is..
Cheers
Rob
Hi everyone. I've been able to get to my shed until this weekend. I have moved jobs and am in the process of moving house so have been rather busy!
In terms of manufacturing, I have just finished the four aluminium alloy top control arm mounts. I now have the material for machining the uprights and am picking up a rotary table for my milling machine tomorrow and then I can begin machining them.
I have been tinkering with the suspension component design for all four corners and have now made the decision to use centrelock wheels. I will still use the BBS rim inners and outers but I will be machining my own 5 spoke wheel centres, similar to these: http://www.fd3s.net/787B/ I have simplified the uprights slightly and managed to lose a bit of weight here and there. I have also started work on the design of the rear suspension
In terms of manufacturing, I have just finished the four aluminium alloy top control arm mounts. I now have the material for machining the uprights and am picking up a rotary table for my milling machine tomorrow and then I can begin machining them.
I have been tinkering with the suspension component design for all four corners and have now made the decision to use centrelock wheels. I will still use the BBS rim inners and outers but I will be machining my own 5 spoke wheel centres, similar to these: http://www.fd3s.net/787B/ I have simplified the uprights slightly and managed to lose a bit of weight here and there. I have also started work on the design of the rear suspension
Subscribed to Rob's blog so have seen the updated chassis and centre-lock wheel plans. Always liked the idea of centre-locks. I guess you would have to carry a 3ft long extension bar to 'tighten/loosen' the nuts ?
Rob - what is the bodywork going to be made out of ? Are you going to take moulds from an original 787B or is it going to be handmade from bluprint/pictures ?
Dom - I know it's not technically Group C, but are you aware of the Porsche 917, I was searching around for info, seems there is a kit car copy of the original 917.
Rob - what is the bodywork going to be made out of ? Are you going to take moulds from an original 787B or is it going to be handmade from bluprint/pictures ?
Dom - I know it's not technically Group C, but are you aware of the Porsche 917, I was searching around for info, seems there is a kit car copy of the original 917.
dtmpower said:
Dom - I know it's not technically Group C, but are you aware of the Porsche 917, I was searching around for info, seems there is a kit car copy of the original 917.
Hey John, beautiful car but a bit 'old school' for me! Quite a few quality replicas of that around these days though!dom9 said:
dtmpower said:
Dom - I know it's not technically Group C, but are you aware of the Porsche 917, I was searching around for info, seems there is a kit car copy of the original 917.
Hey John, beautiful car but a bit 'old school' for me! Quite a few quality replicas of that around these days though!Rob - what tyres do you intend to use for the road ?
I've always wanted to put the centrelock wheels on the car but to save on time and money I was just going to use the 5 bolt BBS centres I already have. After much thought though, in the interest of authenticity mainly I've decided centrelocks are the way to go. They also look the part too and will make swapping wheels round at the track alot quicker!! It will mean carrying around a large socket and extension bar though.
As a result, I am thinking I may be putting the BBS rim centres and various 16" halves up for sale if there are any takers for the right sort of money??
The body will be made of GRP initially with the view to being made out of Carbon Fibre once the absolute final body design is sorted. I know a guy that can help me with this. There were very few 787b's ever made and tracking them down has been a real task. I should hopefully in the near future be able to get a good look and be able to take photos and measurements etc so along with the blueprints I have I will be able to make my own moulds. As I said before, the body design will have to be tweaked somewhat for a road legal car.
As for tyres, the cars based around using Kumho V70 at all four corners. These tyres are of the road-legal trackday variety...
As a result, I am thinking I may be putting the BBS rim centres and various 16" halves up for sale if there are any takers for the right sort of money??
The body will be made of GRP initially with the view to being made out of Carbon Fibre once the absolute final body design is sorted. I know a guy that can help me with this. There were very few 787b's ever made and tracking them down has been a real task. I should hopefully in the near future be able to get a good look and be able to take photos and measurements etc so along with the blueprints I have I will be able to make my own moulds. As I said before, the body design will have to be tweaked somewhat for a road legal car.
As for tyres, the cars based around using Kumho V70 at all four corners. These tyres are of the road-legal trackday variety...
I have a lot of respect for some who can *BUILD* a car.... I wish you all the best.
I've heard some fantastic stories about the 787B and how it used to be stupidly loud, I do like it but I never knew about the RX-792P and since seeing it in this thread I am in love! I love the shape of the windscreen and everything! What a beautiful car!
I've heard some fantastic stories about the 787B and how it used to be stupidly loud, I do like it but I never knew about the RX-792P and since seeing it in this thread I am in love! I love the shape of the windscreen and everything! What a beautiful car!
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