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#1
11-08-2009
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balsa chassis?
i was wondering if this would work.... i was thinking for my next project (EDF/solid rocket powerd car) i could use balsa wood as a chassis...
but use 2mm balsa wood sandwhiched inbetweens 1mm aluminum on either side (so a 4mm balsa/aluminum chassis) i was thinking this because it would be light, and rigid? (would it be rigid?) and easy to cut and drill using a dremel? im not sure how realistic this is, as i havent used aluminum much (im fine with balsa) my budget for the whole car iv set at £250.... and the EDF part is not cheap.... help would be apreciated thanks chris 
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#2
11-08-2009
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Balsa between thin ally sheet would be excellent if done correctly, but I don't think the sizes you are talking about would be much good. It would need to be 8 - 10mm thick with 0.8 - 1.0mm sheet firmly bonded using epoxy resin. You won't get the stiffness with 2mm thick balsa, at least I don't think you will. Best thing is to try it!
Some of the lightest and stiffest aerospace & motorsport materials use a 'weak' honeycomb core trapped between alluminium sheet.
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#3
11-08-2009
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Quote:
iv also been told i should coat all the balsa in epoxy like they do on model boats and it stiffens like a rock.... i have some pretty stiff 3mm balsa here infact i cant bend it atall untill it snaps... and the ally is just so if it does snap during a speed run it wont come apart and destroy my car... the chassis wont be flat either... there will be a virticle sheet in the middle to stiffen it and to fasten things too like batteries etc...
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#5
11-08-2009
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Quote:
 im hoping for 140mm worth of edf fans and maybe a C class solid rocket for the final few metres before the speed trap 
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#8
11-08-2009
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Once it's done - Just make sure you post a video of this 'Weapon'.... It's either going to be awsomely fast and well impressive to watch, or it could go terribly wrong (that would most probably be gutting for you, but great entertainment eitherway)
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#10
11-08-2009
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Quote:
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#11
11-08-2009
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Quote:
__________________
DO NOT BUY/SELL TO THIS USER.
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#12
12-08-2009
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Quote:
ill do some experiments i guess... im also planning a liquid fuel rocket (as it hasnt been done yet, hybrid has) for next year, and only using solid rockets wont feel like an rc to me...
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#13
13-08-2009
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Reminds me when i made an snow sledge with propelelr and some balsa damn that thing was ridiculus fast i had an old technipower on it and i coverd the balsa with some plastic for aeroplane wings.
It looked like an swamp boat the kind they use in florida . When i tested it for the first time i slammed on the gas and it took of still the fastest thing i have ever seen very hard too stear i crashed it on its maid voyage. But it was an really fun and exited 20-30 seconds or so. mvh isobarik
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#14
13-08-2009
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im having second thoughts about the EDF/rocket design... it seems a bit.... dry...
im now thinking of looking into some seriouse rockets, a liquid rocket (no, not a waterbotle rocket :P) i know how they work (to an extent) and i understand there dangers and limitations, i also understand they could easily blow up... but if theres one formula i know, is that danger = fun.... i think it will make a good project, something to get my teeth stuck into, ill get some help from some amature rocket hobbyists etc, and hopefully get one built... what do you think?
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#15
13-08-2009
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Balsa wood composites can very very strong if constructed right. The WW2 De Havilland Mosquito was a Balsa & Ply construct for example. A lot of it is down to adhesive soak & spread i.e it needs to be consistent and have a solid 100% area coverage.
Sounds a great project, make sure you have a video handy when it takes off  Hopefully not upwards 
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#16
13-08-2009
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some great info, thanks guys... if i use ply in my chassis... i could call it plyamunimum?
anyway... ill need to sell my pred and the rest of my gear after iv designed the car.... i may do some material testing before hand... can you get 2mm ply?... anyway, thats not important, ill try both with ply and balsa... maybe test it in comparison to carbonfibre... anyway, i guess i should get to work...
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#17
13-08-2009
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Quote:
__________________
who knows who cares 
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#18
13-08-2009
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no way in hell could i afford a turbine lol... there in there thousands right? unless you can offer me one for £100....
a rocket is cheaper anyday (suprisingly)... but i think a rocket needs to be less acurate than a turbine, as the rocket has no moving parts (virtually) whereas a turbine needs to be ballenced etc...
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#19
13-08-2009
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you can get very thin sheets of ply, remembering back to my days of RC gliders, some of the ply i used then was as thin as cardboard but used to strengthen key parts of the airframe. Very important to consider the glues you use as well, superglue and pva combined, one on one side of the join one on the other squeeze together and never again to seperate to heavy to use to much on a glider but a neat trick for where you need strength.
While i think about it another way of gaining strength but keeping things light was to glue a layer of carbon fabric between thin sheets of balsa laid up with the grain at 90 degrees to each other. Have a read up on the mosquito a fantastic bit of engineering or should i say cabinet making and a good insight into how strong laminated wooden structures can be.
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#20
13-08-2009
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if so get in touch with amt jetcat etc. and it would be interesting to see a liquid fuelrocket like the russian space rockets
__________________
who knows who cares
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