Well well, here we are at the business end of the PMR1 build. We will have the duct built (read put together). Also the beautiful marriage of the rear drive with the duct assembly. All this! keep reading.
We talked back and forth about how to go about the duct. XPS was suggested, pvc foam was also in the mix. I made a mock up to see what a duct would or could look like. Also so I could stare at it and figure how to attach the duct to the hull. More looking earnestly was done to figure how to attach the rear drive to the duct. Then how to attach the rear drive to the hull. then how to line it all up with the engine and drive line. Everything needed to be within millimetres to work properly. This is a maximum pain, so my winging levels hit all time highs. Ask Mr Moody. I didn’t ask for help as much as moan how my ideas keep failing. Paul was a kind ear throughout this build. He was also learning with me as we trotted along.
I didn’t build the duct, I ordered it from England – I needed an easier answer than I was coming up with. It came with the spinner and the flow straighteners. It was not easy to put together, the duct and flow straighteners and splitter that is. I arranged it more than once before I got it right. The final picture shows my mock up of the rear drive included in the duct with no crossbar used. The Duct I received was not right for the PMR1. We will get to that when we try to fly this craft for the first time.
For now the duct in the photos now have a story. There will be more pictures of the duct as it turns blue before your eyes. This is a complex and difficult part of the build. I did it without too many instructions. What I was given by PMHT was dimensions, depths, vibration mounting info other engineering info to get everything in the right place. This next part is a collaboration to make the unworkable, just work.
Well well, here we are at the business end of the PMR1 build. We will have the duct built (read put together). Also the beautiful marriage of the rear drive with the duct assembly. All this! keep reading.
We talked back and forth about how to go about the duct. XPS was suggested, pvc foam was also in the mix. I made a mock up to see what a duct would or could look like. Also so I could stare at it and figure how to attach the duct to the hull. More looking earnestly was done to figure how to attach the rear drive to the duct. Then how to attach the rear drive to the hull. then how to line it all up with the engine and drive line. Everything needed to be within millimetres to work properly. This is a maximum pain, so my winging levels hit all time highs. Ask Mr Moody. I didn’t ask for help as much as moan how my ideas keep failing. Paul was a kind ear throughout this build. He was also learning with me as we trotted along.
I didn’t build the duct, I ordered it from England – I needed an easier answer than I was coming up with. It came with the spinner and the flow straighteners. It was not easy to put together, the duct and flow straighteners and splitter that is. I arranged it more than once before I got it right. The final picture shows my mock up of the rear drive included in the duct with no crossbar used. The Duct I received was not right for the PMR1. We will get to that when we try to fly this craft for the first time.
For now the duct in the photos now have a story. There will be more pictures of the duct as it turns blue before your eyes. This is a complex and difficult part of the build. I did it without too many instructions. What I was given by PMHT was dimensions, depths, vibration mounting info other engineering info to get everything in the right place. This next part is a collaboration to make the unworkable, just work.
Originally posted to the Australian Hovercraft Association forum
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Jeremy Ludlow