Recent content by Pat1311

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    120 cc 7 cylinder radial

    No,there's no pin in there. I thought about pinning the shaft but was advised not to because the shaft is a shrink fit in the counterweight and it would only weaken things. And there's allready not much "flesh" around the shaft. I'm by no means sure if it is going to be strong enough...
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    120 cc 7 cylinder radial

    The pins fit very nicely,the rods can rotate freely and there is no play at all. Next to make were the gears and a bush where the gear shaft runs in ,but first I had to make an arbor for my new bought module 1 gear cutters. I needed 1 10 tooth gear on a shaft and 2 25 tooth gears. The 10...
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    120 cc 7 cylinder radial

    Next were the big end pins and 2 cover plates that secure the pins. I also had to make 3 bronze washers.
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    120 cc 7 cylinder radial

    Next parts to make are the con rods. Not very complicated but the holes for the big and small ends have to at the right distance and the bores have to be exactly 7 mm in my case. I ordered some flat stock 7075 alu,this was a bit hard to find so I had to order it in Germany,a bit expensive...
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    ENV aero engine project

    wow! That engine is gorgeous ...
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    120 cc 7 cylinder radial

    And a quick mock up and test fit just to see how it looks. Next will be the conrods and then another try on the camdisk and the rest of the gears. I decided to make the gears myself,I ordered a set of module 1 gearcutters,see how that goes.
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    120 cc 7 cylinder radial

    Because I didn't have any C45 in the right diameter to give the cam disk another try I made a start on the cylinders. The start of making 7 or even 14 of the same parts. I also made a fixture to mill out the conrods,took me 2 hours but it will shorten the time being spend on the 6 conrods by...
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    120 cc 7 cylinder radial

    No, No lift diagram or coordinates,not yet anyway. Last year I converted a small(only 60KG) benchtop mill where I had no use for anymore to cnc. Bought some chinese steppers,drives and 3 little ballscrews and then I had a litlle cnc machine in my garage. Unfortunately,it's not very accurate...
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    120 cc 7 cylinder radial

    Wow, Handfiling the corners,I love the dedication this hobby takes:) I did some work on the exhaust cam disk. Had to be made out of carbon steel so it could be hardened,designer suggests C45 which hardens quiet easy when heated just over 800 C and the quenched in oil or water depending on...
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    120 cc 7 cylinder radial

    That's looking sweet! That valve cover looks very nice,how did you make that?
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    120 cc 7 cylinder radial

    Great to hear you are building a radial too,and not the least also. The Ohrdorf engines are very very nice engines,nicer in design then the Jung versions but also require a higher skill level I think. Which one are you building and do you have a buildlog? Really want to see some pics of it...
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    120 cc 7 cylinder radial

    Right, Yes,eventually the rings will come up,better said they just popped up when I read your question. First I didn't know what the Trimble method was but after searching a bit I stumbled over an article on modelenginenews. This was somehow how I made my rings before. Jungs method...
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    Forrest Edwards radial 5

    Sorry offtopic again... Thank you for the info. I've read his blog and his engine is really a beauty,he's a bit of a CNC wizzard too. Only I think he's building the nine cylinder version.
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    120 cc 7 cylinder radial

    Last part I made was the master con rod. I made this out of 7075 alu,very nice to machine and very strong. Unfortunately it is not easy to get in flat stock so I had to machine it out of a slice. First milling some squareness to it and reducing the thickness to 15 mm for the big end. I then...
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    120 cc 7 cylinder radial

    Ok, Next part I made was the crankshaft ,I've finished it just last week together with the master conrod. According to the plans the crankshaft had to be made in one piece but turning a lump of 90mm round 200 mm long C45 excentric with an interrupted cut down to 17 mm would have been the end...
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