Deskpilot Posted June 1, 2018 Share Posted June 1, 2018 I need to replace the wind-screen of my Thruster which is 1.5mm polycabonte sheet. Trouble is, I can only get 1.0mm locally. Will this be strong enough? Being formed into a continuous curve, I think it might be but would like a more experienced opinion if any-one is up to it. Thanks in advance, DP. Link to comment Share on other sites More sharing options...
rgmwa Posted June 1, 2018 Share Posted June 1, 2018 I don't know the answer, but compared to 1.0 mm sheet, 1.5 mm sheet will be about 3.3 times stronger in bending and 5 times stiffer. Link to comment Share on other sites More sharing options...
fly_tornado Posted June 1, 2018 Share Posted June 1, 2018 Get 2mm sheet 1 Link to comment Share on other sites More sharing options...
Methusala Posted June 2, 2018 Share Posted June 2, 2018 I think that 2mm sheet is too heavy (add lightness). It could stress crack when pulled around. Try to source 1.5, otherwise, 1mm might do. Link to comment Share on other sites More sharing options...
fly_tornado Posted June 2, 2018 Share Posted June 2, 2018 no 2mm is fine, it won't crack when you bend it around, the weight difference is miniscule Link to comment Share on other sites More sharing options...
Deskpilot Posted June 2, 2018 Author Share Posted June 2, 2018 My local supplier goes from 1mm to 3mm and that's way too thick. As for weight, I've already added so much I'm beginning to wonder if I'll actually get of the ground. Mind you, I had to put another hole in my belt last week. Not saying I'm loosing weight, it's just shifted some-where else. Link to comment Share on other sites More sharing options...
fly_tornado Posted June 2, 2018 Share Posted June 2, 2018 its a trade off, more weight will mean its less likely to collapse at speed, less weight means you get up to speed faster Link to comment Share on other sites More sharing options...
Thruster88 Posted June 2, 2018 Share Posted June 2, 2018 I got 2mm for my t500 on eBay, came in a roll no damage 1.2x1.8 sheet. Link to comment Share on other sites More sharing options...
IBob Posted June 3, 2018 Share Posted June 3, 2018 Savannah is 1.5mm If this is indeed 3 times stronger and 5 times stiffer then 1.0mm, it would seem worth going the extra mile for? Link to comment Share on other sites More sharing options...
Deskpilot Posted June 3, 2018 Author Share Posted June 3, 2018 Thanks for your replies guys. Guess I'll have to look further afield. Link to comment Share on other sites More sharing options...
IBob Posted June 3, 2018 Share Posted June 3, 2018 Good luck, DP. I reckon it will be worth the search. Link to comment Share on other sites More sharing options...
rgmwa Posted June 3, 2018 Share Posted June 3, 2018 Savannah is 1.5mmIf this is indeed 3 times stronger and 5 times stiffer then 1.0mm, it would seem worth going the extra mile for? Oops! I should have said 2.3 times stronger and 3.3 times stiffer. Apologies all. However the difference is still significant given the small increase in thickness. Can’t go back and edit my previous post unfortunately. Link to comment Share on other sites More sharing options...
Deskpilot Posted June 3, 2018 Author Share Posted June 3, 2018 No worries rgmwa Link to comment Share on other sites More sharing options...
Downunder Posted June 3, 2018 Share Posted June 3, 2018 https://www.ebay.com.au/itm/1220-x-2440-x-1-5mm-Polycarbonate-Clear-Sheet-Bayer-FREE-POST-Auswide-Hurry-up/252308477447?epid=589299438&hash=item3abec1d607:g:j5gAAMXQ-3NRnFy9 1 Link to comment Share on other sites More sharing options...
howe Posted June 17, 2018 Share Posted June 17, 2018 Dotmar plastics, believe they have a branch in most capital cities and do 1.5 mm Link to comment Share on other sites More sharing options...
Old Koreelah Posted June 17, 2018 Share Posted June 17, 2018 The good new, DP, is that polycarbonate is getting cheaper. The price halved in the last ten years, presumably because it's now sourced from China. That means is cheaper to replace your screen, which you need to do much more often than with acrylic (Perspex) which is harder, less scratch resistant, but more easily cracked. I'd like to see how thick our screens need to be; has anyone whacked a curved sheet of poly with a defrosted chook travelling at 90knots? 1 Link to comment Share on other sites More sharing options...
Thruster88 Posted June 17, 2018 Share Posted June 17, 2018 The good new, DP, is that polycarbonate is getting cheaper. The price halved in the last ten years, presumably because it's now sourced from China. That means is cheaper to replace your screen, which you need to do much more often than with acrylic (Perspex) which is harder, less scratch resistant, but more easily cracked.I'd like to see how thick our screens need to be; has anyone whacked a curved sheet of poly with a defrosted chook travelling at 90knots? No, but big bird's go thru a cherrokee screen which is about 5mm Link to comment Share on other sites More sharing options...
Old Koreelah Posted June 17, 2018 Share Posted June 17, 2018 No, but big bird's go thru a cherrokee screen which is about 5mm I presume the Cherokee screen is (brittle) acrylic. I guess speed is a major factor. Even the incredibly sloping F-111 screen couldn't protect its crew from bird strike. Link to comment Share on other sites More sharing options...
gareth lacey Posted June 17, 2018 Share Posted June 17, 2018 You can hit polycarbonate with a hammer it will not shatter ,the fixings would give up first 1 Link to comment Share on other sites More sharing options...
Old Koreelah Posted June 17, 2018 Share Posted June 17, 2018 It's great stuff, Gareth. I feel much safer behind polycarbonate than acrylic. My motorcycle helmet visor was once hit by a golf ball-sized rock thrown up by an oncoming vehicle. Impact speed must have approached 200k, but the curved lexan protected my features by bending in enough to whack my nose. I've driven nails thru it, bent it in the vice with a hammer and made lots of items from off cuts. Like some grades of aluminium, lexan will crack if bend at too tight a radius. It's also hygrostatic- absorbs moisture- which leads to problems if you're dumb enough to try heat-bending it as I did. The moisture eventually boils, exploding the lexan sheet into a blistered mess. It can be forced into complex forms if heated beyond 130C (from memory), but first the water has to be dried out by oven-curing at 60C for 24hrs. Link to comment Share on other sites More sharing options...
gareth lacey Posted June 17, 2018 Share Posted June 17, 2018 I will be using it for my front screen and gull wing doors on my build Link to comment Share on other sites More sharing options...
Old Koreelah Posted June 17, 2018 Share Posted June 17, 2018 I used lexan for the screen and perspex/ acrylic for my canopy, so that I have a chance of smashing my way out if I prang it. I also cut slots to all mounting holes to make it easier to break out. 1 Link to comment Share on other sites More sharing options...
Deskpilot Posted June 18, 2018 Author Share Posted June 18, 2018 Thanks Howe. Found them north of the city so will be taking a long drive some-day soon. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now