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Five Cylinder Radial With Ohc

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Bill W.

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Welcome back, Brian!!
Did you miss the project while on "holiday?"
Bill W.
 
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Hi Bill
Dropping the project for a while has been rewarding, being on top of the problems all the time leads to overthinking some of them .
some perceived problems have simply disappeared after the rest.
Strangely I did not miss the shop but I am glad to be back. I think I missed H M and all of you more.
Brian.
 
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The parts for this job are a 1mm drill and a 1 mm end mill plus a length of 1mm pivot steel.
P1013609.JPG

The cross holes in the shaft where drilled first.

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Then the slots in the pulley's

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Cross pin cut to length.

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And the shaft's assembled.

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I am now waiting on the delivery of an ER 40 collet chuck so I can make the remaining camshaft pulleys
Brian..
 

thomas s

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nice job Brian, This was one of the Area's that I was interested in how you would drive the valves. Because it is a radial engine.
 
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At last I can fit the rear cover with all the works inside apart from the oil seals that separate the wet gear case from the dry belt casing
the outer bearings will be covered with caps that will set the end float for the shaft's ,these in turn will be retained by the pressure and scavenge oil
pumps that will be co axial to keep the size down.

P1013617.JPG

The ER 40 chuck has arrived so now I can continue with the camshaft pulleys and then the belt tensioners.

Brian.
 
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With the ER40 collet I can now hold the blank material for the pulleys better so I am ready to go.

P1013618.JPG
Part off the bar to length

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Turn down the boss

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Cut the inner flanges

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Then the outer flange come timing disk.

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Drill and tap the holes for the pinch screws.

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Assemble ready for fitting.

P1013627.JPG

Brian.
 
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Next job is to make the belt tensioners.
Set up for machining the offset pin,
P1013632.JPG

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Ready for the retaining screw positions to be machined.

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Trial fit of tensioner pulley.

P1013636.JPG

Brian.
 
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Continuing with the tensioner I have now tapped the thread for the pulley retaining screw and threaded the fixing shaft . Photos of it in place ,just needs the shaft cut to length and a Nylock nut.

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4 More to do Brian.
 

kvt

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Looks nice, How do you gauge the tension you need on the belt.
 

woodchucker

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That's a backplate of the engine, and you have a shaft coming out the back.
Are you going to do an electric start using that end of the shaft?
Very nice work.
 
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Ken
The tension is assessed by holding the belt half way on the longest run. and twisting the belt it should tighten up at quarter of a turn.
This works on all sizes of syncro belts

Jeff
I did look at the possibility of fitting a starter but thought it was going to be to heavy if I want to fly it.
The shaft as you see it in the photographs is in fact a handle to turn the gear train for testing, the shaft it fits over is 8mm and will have a eccentric to drive the two oil pumps coaxially to provide pressure and scavenging.
When I have all the tensioners done I will then remove the material between the tensioners and the mounting holes down to the size of the crank case.
Thank you for your questions.
Brian.
 
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At last I have made the tensioners only the four remaining guide rollers to finish,

P1013640.JPG

Now comes the part I have been longing to do.
Reducing the back plate to its correct size.

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And a trial fit.

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Brian.
 

FOMOGO

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Absolutely brilliant work. Would the belts require some type of gaurd to prevent f.o.d damage in actual use?
 
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An interesting point, as the belts are behind the cylinders I think they are well shielded. and if this motor gets to fly most of the cylinder will be inside the cowling anyway.
Thanks for the thought anyway I had not even considered it
Regards Brian.
 

rwm

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Fantastic. You are crazy if you fly that work of art!
Robert
 
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Thanks Robert for confirming something I had often wondered about.
Brian.
 
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Thanks azshadguy for the Vid Fantastic.
 

woodchucker

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Fantastic. You are crazy if you fly that work of art!
Robert
He is crazy if he doesn't. Machines are meant to be used, so are engines. He can put it on a display stand after he has fun using what he spent so much time building.
And way more people would get to view that work of art , in another work of art flying vs being on his shelf being displayed.
And the most pride can be found using such a beautiful engine.
 

Tozguy

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Brian, totally awesome work you do. Videos are also very well done. I absolutely have to start piping some of that music from your above video into my shop, would you give me the name of the musicians please.
 
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Oh dear that only get's you to the site.
The name is Succotash by Silent Partner.
Brian
 

woodchucker

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Hey Brian, it's been quite a while, anymore progress on your radial? Drooling for more.
 
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Hi Jeff.
Yes I have had to limit my spending on workshop projects, a 20% drop in the exchange rate due to the UK voting to leave the European Union
has hit me very hard. However things will progress, but at a slower rate. I have just been given an offcut that will do very nicely for the master rod
so I am now working out how to go about making it, the rod is only 3 1/2" long so it will be a challenge.
Thanks for your interest It helps a lot when things are not going as smoothly as one would wish.
Brian.

P1013747.JPG
 

kvt

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Brian, I also was curious, but also know that you some times went a while without working on it. But glad you have started looking at it again.
looking at the drawing, So one rod is solid and the other 4 attach to it. Is that correct.
ken
 
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