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Cutting Acrylic Transom Flaps |
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rb_stretch 
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Joined: 23 Aug 10 Online Status: Offline Posts: 742 |
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 Topic: Cutting Acrylic Transom FlapsPosted: 30 Jan 13 at 1:35pm |
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It seems the Wickes acrylic sheet is particularly fragile as I just tried scissors which caused it to fracture all over the place. Oh well £18 down the drain.
Need a plan B now.
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JohnW
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Joined: 17 Jul 07 Location: United Kingdom Online Status: Offline Posts: 552 |
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Posted: 30 Jan 13 at 1:44pm |
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Is this for your Alb? If so, most boats use a flexible sheet that can be cut with scissors.
This kind of thing: or But if you can get some clear stuff that is better, so that you can check fore and aft trim through the flaps where the water leaves the transom. |
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Jack Sparrow
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Joined: 08 Feb 05 Location: United Kingdom Online Status: Offline Posts: 2965 |
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Posted: 30 Jan 13 at 2:42pm |
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use a very fine tooth fret saw or an abrasive tile saw and then sand the edges down! Or trim with a wide amount of spare and sand in down with a rotary power sander, either bench or drill or grinder. |
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rb_stretch
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Joined: 23 Aug 10 Online Status: Offline Posts: 742 |
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Posted: 30 Jan 13 at 2:54pm |
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Yes for the Albacore. The Mylar looks like it will be much more robust than Acrylic, so definitely worth considering.
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rb_stretch
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Posted: 30 Jan 13 at 2:56pm |
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The only challenge I have with using saws which are not just a blade is that I can't cut the flaps big enough. I think in my next go I'm going to use the scoring and snapping technique gradually working down to the approximate shape and then belt sander to smooth it out. Will report back. Edited by rb_stretch - 30 Jan 13 at 2:57pm |
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rb_stretch
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Joined: 23 Aug 10 Online Status: Offline Posts: 742 |
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Posted: 30 Jan 13 at 5:21pm |
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Problem solved.
I needed to drop some fids I had borrowed from Guildford Marine and they basically said that Acrylic was a lost cause in the way I intended to use it ie. it would always be susceptible to shattering (as with the original flaps). They basically sold me an offcut of 1.5mm Lexan, which seems far more robust. Going to try and cut that with a stanley knife. The also sold me an offcut of aluminium keel band to hold the flaps against the hull on the inside edge. Makes you realise you can't do everything through internet chandleries. |
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sawman
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Joined: 04 May 11 Online Status: Offline Posts: 205 |
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Posted: 30 Jan 13 at 7:05pm |
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I need to replace transom flaps at the moment - the current ones are very heavy and hinged. Is 1.5mm lexan flexible enough to be fixed without a hinge?
I wondered if 1mm might be more flexible
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rb_stretch
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Posted: 30 Jan 13 at 10:17pm |
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I have 1.5mm and it is easily flexible enough to use without a hinge.
Having said that this is on an Albacore with some pretty big flaps. If they are small then I think 1mm might be better (in actual fact Guildford Marine do use 1mm for smaller flaps and 1.5mm for bigger ones)
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sawman
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Joined: 04 May 11 Online Status: Offline Posts: 205 |
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Posted: 31 Jan 13 at 7:02am |
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cheers, the old flaps on my miracle are about 4 inches across. I am tempted to make a hinge with shockcord passing though, having seem a couple of pics on the net.
There seems to be a huge supply of lexan in different thicknesses on ebay, at a reasonable cost compared to the pinbax item linked to earlier
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Jack Sparrow
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Joined: 08 Feb 05 Location: United Kingdom Online Status: Offline Posts: 2965 |
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Posted: 31 Jan 13 at 4:00pm |
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Plastic Direct LINK http://www.directplastics.co.uk/polycarbonate-sheet
with does it stick this in the code! (=%20)!!!!! Edited by Jack Sparrow - 31 Jan 13 at 4:01pm |
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