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#1
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FWD/FF Buggy
I'm really disappointed that we don't see them around: FF Buggies! When I first saw these buggies a few years back (the Ryuz FF for example), I fell in love with them. They are beautiful, quirky and a comeback into the 2WD scene would make things very interesting! It's not likely this will happen anytime soon as many organisations state in their rules that FF buggies are to be run amongst 4WD buggies.
Anyway, in 2009 I already set myself the task to make a basic FF buggy from a Tamiya FF01, using Tamiya DF01 suspension arms: http://www.tamiyaclub.com/forum/inde...howtopic=51668 http://www.tamiyaclub.com/showroom_model.asp?cid=90871 The goal was to make a conversion without making custom parts. It went rather well and it was absolutely a blast to drive, but of course with a chassis from the early to mid 90's, no slipper clutch and 70mm shocks I wasn't going to get anywhere on a track without the car falling apart. For a while I just put the idea of making an FF buggy aside. Recently I picked this project back up, but not with the car you see above. I plan to build a new chassis that is ready for testing on the track. The screenshot below shows what I built up this weekend in Solidworks: The chassis will be based on a TRF201, as I already have one (so they can share the same bulk of spares). The gearbox and front suspension will be taken from a TRF201, the front uprights and caster blocks will come from the DB01/TRF511. The front suspension arms are to be considered as Tamiya's existing buggy arms would make for a front end that's 260mm wide instead of 250mm (plus, the TRF201 driveshafts are about 5-8mm too short on each side with the existing arms). There are a few things which I need to clear up, which are how I'll mount the top end of the shocks and what steering assembly I'm going to use. |
#2
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so do you think in low traction this will be a better choice than a mid or rear wheel drive buggy?
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DO NOT BUY/SELL TO THIS USER. |
#3
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Cant wait to see it take shape
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#4
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What about mounting the motor behind the diff, inside the body. Obviously the steering system becomes a big issue then but the car would be alot more balanced than having the motor out front, no?
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#5
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Id like to see the motor inboard! (Behind the diff) You could mount the servo similar to how the pred X11 is done, With the servo in the middle of the car.
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#6
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Anyone remember the Kyosho Maxumm FF, I had one in the 80's and it was a horrible car. All it did was wheelspin, couldnt get it to turn when on power and it jumped awful. Im guessing now with all the power we have, it will just be 10 times worse. Not trying to shoot you down or anything, just sharing my experience with them.
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#7
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Quote:
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www.kamtec.co.uk www.fibre-lyte.co.uk answer-rc.com/uk/en/ Answer UK team driver Designer of the Lazer ZX/ZXR carbon fibre tub chassis Designer of the Lazer ZXRS |
#8
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Hehe, nice amount of replies with mixed opinions
My choice for the motor at the front is for several reasons: 1. Space: It will be hard to get a construction with the motor over the steering assembly, yet retaining a low CoG and a tough steering set. 2. Weight distribution: FWDs have more problems getting traction than RWDs, and considering their weight balance from front to back I guess a motor in front of the diff will work best. Plus, if the weight balance does need to be further back, it's easy to add weight inside the chassis. However, mounting them in front of the chassis is way less effective and harder to fit. I also considered using the DEX210's parts as a base, but as I am using a TRF201 right now it's only logical to use that as a base for this - I'm on a budget after all. Plus, making the Mid motor and Rear motor options possible on an FWD chassis is a bit more complicated than an RWD chassis. I just want a chassis with some degree of thought put into it that I can use to develop a better chassis - at least, that's the plan |
#9
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Quote:
The Maxxum had the motor behind the steering linkage, it could never put the power down. The successful Japanese FF buggies all had the motor hanging out in front, and on loose dirt tracks they they were as fast as any rwd buggy. A few examples: Grahoos Poprod Old Ryuz style FFs and Bloodclods Ryuz style build and on Oople Bloodclods FF03B A few old FF buggies in this thread
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#10
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+1 on Grahoo's buggy, I love the design of it!
http://www.youtube.com/watch?v=Obs-m...ure=plpp_video Here's a video with Grahoo's original Poprod from 1988 driving in a competition (at 1:10 interview with the driver, start of race around the 2:30 mark). Notice that it's easily as quick as the RWD buggies driving around and drove around on the first place for a while before making a mistake. I know the Wild one, Falcon and Fox are not like the RC10 would've been as a competitor, but it shows their potential on video. The potential that the Poprod shows is reflected in today's buggy regulations. Many organisations state that FWD buggies are to be driven with 4WD buggies. I recall reading this happened when some drivers started using FWD buggies for slippery tracks and RWD buggies for tracks where the RWDs could put the power down more easily. The regulations meant the instant end for FWD buggies in competition. After all they were put into use for their performance, not for their quirky construction. Grahoo rebuilt his Poprod a few years ago (Link), but with a TA03 transmission and a few modern parts I believe. This and Bloodclod's FF buggy build were of great inspiration to try and build my own FF Buggy |
#11
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Cool project, always wanted to make a Ryuz replica but not being able to race it in 2WD class is a bummer
With the speeds cars go these days compared to when they got banned I can't see a FWD being faster than a RWD. |
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