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An absolute work of art

total awesomeness!

You're a very brave man Terry! LOL! It's going to be a treat to see how you manage this insane challenge!

I recently found a thread on an engine building forum posted by a someone in the US who rebuilds Merlin engines and he posted some very interesting photos and accounts of how exacting and precise the tolerances are in these engines. He detailed the procedures for reconditioning the fork and...

Awesome stuff Terry Only 2 valves per cylinder on the scale model then? Well! It'll save you machining an extra 24 valves and associated components!

Mindblowing!

This is better than any TV show!

This is going to be 2 years of fascinating reading!

Splendid That's better!

Hi Terry I'm attempting to model an 18 cylinder radial in Pro/Engineer, similiar to Solidworks. This is just a bit of fun. I don't have the skills to even begin being able to produce one. As you can see from the attached images, my connecting rods are too short and approaching TDC, the...

R-4360 Terry! You know it makes sense! ;D

Awesome! That's saved me some serious head scratching! Thanks Terry

Hi Terry. Well.......all of them really! I guessed they were 14 1/2 gears from the shape of the teeth I was looking at the teeth you cut into your crankshaft and was wondering what size the gear is. I assumed 16 teeth on a 0.5" PCD since this a standard regularly available gear size (32...

Terry What is the spur gear spec used in this engine? Are they metric spur gears or imperial. I guessing they are about metric module = 1 but the imperial sizes 24 and 32 DP both seem to give the wrong diameters

I'm sure it's far less important on a scale motor with much smaller inertial forces but I'd like to purchase a set of Hodgson's drawings and to see what he specifies, (and much else besides!!). The R-4360 is ever more bizarre, having master rods in A7, B4, C4 and D1 and to complicate things...

Another question Tony Which cylinders numbers do the master rods fit inside. From memory, on the full size R-2800, they aren't positioned where you'd expect them to be! Interesting article about R-2800 crankshaft development here. "As it turned out, the main factor contributing to the 1X...

Totally understand your methodology bearing in mind the complexity of this project I guess hardening would create potential distortion problems in addition to having to grind the journals and crankpins to the correct diameters How about an R-4360 for your next project!!!!!! I just watched the...

Congratulations Terry I can't stream video here at work so I'll have to wait until I get home before I can view it Thanks for the explanation regarding the cam ring concentricity. That's one hell of a big bearing surface to keep them concentric with the crank!!!! Just one more question I...

I've been reading this thread now for a couple of days (in complete AWE) but the one aspect of the Hodgson design I cannot fathom is how the cam rings are kept running concentric with the crankshaft. On the Olsryd design that I am familiar with, the cam ring has a centre bearing that runs on the...

Just stumbled upon this amazing thread. Funny to find it right at the moment of truth when all this incredible workmanship comes to fruition. I found this thread by accident, not being a hobby machinist but being fascinated by radial engine design. A little while ago, I found the plans...