Good work Terry. Interesting to see you've gone with the hinge pan chassis. Look forward to seeing how you attach the front wheels and how you go about setting the their ride height, and, the rest of it. Keep it coming, you build some really nice stuff and they are good performers.
Terry, it may be "low tech" to you but it's beyond anything I've ever attempted in 9 years of building cars for the VRAA Proxy or 6 years of Tasman Cup cars. Maybe someone will explain to me the theoretical advantages of the hinged/flexi chassis? Of course, many of my previous proxy builds had precious little space between the chassis and the body shell so independent movement was unlikely. Anyway, it looks like you've made a good start on your entry. Will the front axle mount be fixed or hinged as well? I have changed your entry on the list to read "Honda RA273". Don't forget to use the paint scheme the car ran with in 1967, as opposed to 1966.
Post by Terry Newsome on Apr 6, 2017 6:46:22 GMT -5
I have to be honest here with this chassis design, I really don't know if there is a benefit to be had, but its one of those things that I would like to explore and see if there is some advantage compared to my previous chassis which were more traditional and simpler.
I have built sports and sedan chassis in the past with the pivot design and felt it offered some advantages over the more rigid designs, however I'm not sure if any flex or dampening can be achieved in such a narrow chassis.
Of course better hands than mine have already built these chassis with good effect, Chris's chassis seem to work well and if I can duplicate some of that I would be quite pleased.
I guess its one of those things where the best thing to do is build it and take it from there,
I did build a pivot chassis ( 1.5L F1 Honda) about 12 months ago in a test compared to a more traditional design, that comparism saw the rigid chassis more competitive, however I felt I should persevere and see what comes from that, testing so far is patchy, quite quick, but a real handful to drive, quite possibly all down to the scaley slimline motor being too much, testing will continue.....
Stewart, I will be paying close attention to the 1967 cars, I've accumulated lots of pics and info so I should be okay there,
I second what you say about someone offering advice or indeed a "tutorial" on the pros and cons of this design, maybe not for this place but a new "thread" elsewhere.
Post by Phil Kalbfell on Apr 6, 2017 16:36:16 GMT -5
I started building these " Flex board" chassis many years ago after reading a great article by Ernie Mosseti on the theory of the design. They work very well on wider and heavier sports car chassis. But there seems very little advantage in the light narrow VRAA/ Tasman cars. IMO the same can be achieved with carefull selection of chassis rail diameter. That said the Grand kids Tasman wining car last year had no Flex at all!
Post by Terry Newsome on Apr 12, 2017 17:08:49 GMT -5
There has been some testing done,
Thinking of what motor to use, and thinking that my only scratch building of F1 cars has been with the low powered BWA motors and recently the SRP16, I installed the scaley 18k motor not quite knowing what to expect.
Certainly its a whole new world! Power is not a problem, in fact too much so, my previously reliable Pauls urethanes are not up to the mark, bounce and fishtailing everywhere, I certainly didn't want to add weight but I do have an old, but not used, NSR F1 supergrips here, albeit too wide but hey I'll give them a go to see if this will fix the uncontrollable nature of the car.
Times immediately came down to previously unchartered waters, very impressed with the cars speed and handling.
Now I know the tyres are not quite "spec" for this proxy but there is some light at the end of the tunnel, further testing showed times which are consistent, its a lot of fun to have power and be able to control it.
Still lots to do, but the build progresses, a few bits have been ordered, body needs a good going over to tidy up odds and ends and the chassis needs suspension detail ( not my favourite thing to do)
The chassis design seems okay, but its hard to judge if its the chassis or the set up which is working, maybe a combination of both.
Stewart, the front end is independent, but I fear the front does not pivot as much as I originally intended, could be that I did not think that through well enough.
Post by Phil Kalbfell on Apr 13, 2017 16:42:20 GMT -5
Terry One the 3 Litre cars I have built I used NRR Classic tyres from the Fords or Porsche they have tread but great shaped sidewalks. No idea how they will grip on these tracks but worked well in the UK.
Post by Terry Newsome on Aug 2, 2017 3:32:13 GMT -5
After getting sidetracked with other projects its time to get the Honda finished, I've been getting used to the newer formula in as much that it is a bigger overall size to what I've been used to and of course a new motor which has brought its own set of issues, but now the car is going okay so I can get on with finishing and getting it posted
Still a bit to be done and posting day looms, so its a bit of a rush to get the last bits done,
Post by Terry Newsome on Aug 5, 2017 21:36:24 GMT -5
Got some work done on the Honda, all happening now with posting hopefullly tomorrow
Pretty happy with the results, its been a fairly straight forward build, there are so many great looking cars in this proxy hopefully my Honda will be okay and not embarrass itself!
Looking back on my previous comments and at the beginning with my bare chassis, a lot has happened since that time, with the extra power I've had to rebuild the chassis, all good now but I have come up with a very unique feature in that I now have the very first unflexible flexible chassis!
More thought will have to go into the next chassis!