tonyrenshaw268(at)gmail.c
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 Posted: Tue Mar 04, 2014 2:24 pm Post subject: TPDD and request for mod assistance. |
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Hi,
This is my TPDD. You can’t really tell from the photo but the top of the tunnel has been turned into a hinged lid to the underside, where fuel selectors, pumps, etc are to be located. I have an Andair Gascolator on a shelf directly above this reinforced access, which is why it exists. HOWEVER, I could use it as a TPDD. I am using a clear marine deck access fitting with a plastic thread, however I have thought about modifying the lid such that I can screw it out, or in, and in that respect if the shelf was placed accordingly, I’d be able to remove it inflight for photography etc.
I’ve actually ditched that option to be honest though, with things like CO2 entering being my biggest concern. Still, if you were desperate for a TPDD, this would work fine.
P.S. I am challenged to replace the original strength with my mod. Immediately under the throttle slot I have a bulkhead, and it is misleading in the photo how far down the sides I have cut. At the back the side cuts run into the top, and at the front its about 150 mm deep, so the sidewalls of the tunnel are basically intact. I anticipate that the majority of the load is on the vertical faces of the tunnel, engine etc. however the fuselage also is a contributor to the entire load carrying of the engine. I think the flat top of the tunnel is more like the top flange of an I beam, pertinent in the load created with a G manoeuvre by the engine. Without that flange I am struggling to see if I can get the outcome I want, so if anyone has an idea I’d appreciate it. Still, the wide arse mods and the new profile has a negligible top web to this part of the tunnel, and if I don’t adopt those, which I don’t plan on doing, I have more side material in a vertical orientation than they do already, to compensate for the absence of the top web. Still, I plan on doing something, but what is the question.
[img]cid:1F7C7203-A08A-4F07-9489-F0D2342E3910[/img][img]cid:C10E039E-AA99-4CFE-AA90-CF90B6CF260D[/img]
TPDD = Toilet Paper Deployment Device
Tony Renshaw
Sydney Aussie
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