water inlet tube angle
in 912 / 914 Technical Questions
8 years ago
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by jay white » 7 years ago
I have the band it clamps and tools for hoses getting fire sleeved. I made some progress on the top side of the water cooling system today. Here is a pic of the layout. I think I will need a spring on one or more of the hoses.
Am I right that the bottom side is pressurized and the top side is vacuum thus more susceptible to collapse?
Also, if I cut a spring to fit, how do I handle the sharp end where I cut the spring?IMG_0501.JPG (You do not have access to download this file.)
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by Roger Lee » 7 years ago
Springs in the 17mm coolant hose seems to have become fairly popular in use. If I cut a spring I take my Dremel Tool and round the tip that I cut so it isn't sharp. Then I take a pair of pliers and turn the open point inward so it can not contact the hose. Flight Design CT has put springs in these hose for approximately 14 years and I have done it for about 12 years and have never had any issues. When I see the customer again for the next 5 year rubber change the springs are all good. I have done this for 13mm oil hose to on some aircraft that make the hose bend 180 degrees. Then when the hose gets hot it doesn't squeeze down the radius and slow the oil flow. The spring itself can slow some oil flow, but not as much as a badly reduced radius hose. You don't need super strong or thick springs. It's just there to keep the hose wide open and allow it to bend to.
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
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by jay white » 7 years ago
I have hung the engine on the airframe and mocked up the exhaust manifold so that I can view how the fuel lines land water lines will run. The existing fuel manifold from Rotax won't fit because with the intakes swapped, the distance between them increases beyond the length of the original design for the rubber hose. the picture is of a friends SS7. I want to locally manufacture the manifold with like items. So I"m thinking Mcmaster Carr, Parker etc for metric banjo bolts and push on hose fittings to avoid the dreaded gear clamp. If I have to go to Gates hose ... fine, but anyone see why I can't get metric parts to fit this set up and "copy" Rotax's design? Or am I just a ninny and should put together a hose barb octopus like it had before and pray for rain?DSC_0431.jpg (You do not have access to download this file.)
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by Rob Seaton » 7 years ago
your oil tank cap is red, red signifies fuel, yellow signifies oil.
:)
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