PIP 3 Cylinder Radial

[Peter Twissell]

What method did you use to model the prop?
I have recently done a 4 blade prop, by creating a series of sections and lofting between them.

 

[petertha]

Is been a long time since I looked at these plans. It just re-occurred to me the carb is front-ish on the nose case. So presumably the mist charge can lubricate cam gear train, back through bottom rod assembly, through that the rotating vane diffuser/booster? part up to the heads. But I can't quite figure out how that diffuser/booster wheel works. There is an aperture slot on the upper area & a series of holes on the bottom? Any explanation in that regard? (The full parts diagram is shown in post#1)

 

[michael-au]

Are you referring to how the diffuser is driven, ifso this might help understand it
It is driven by a pin in the crankshaft

 

[michael-au]

Is been a long time since I looked at these plans. It just re-occurred to me the carb is front-ish on the nose case. So presumably the mist charge can lubricate cam gear train, back through bottom rod assembly, through that the rotating vane diffuser/booster? part up to the heads. But I can't quite figure out how that diffuser/booster wheel works. There is an aperture slot on the upper area & a series of holes on the bottom? Any explanation in that regard? (The full parts diagram is shown in post#1)

Are you referring to how the diffuser is driven

 

[michael-au]

What method did you use to model the prop?
I have recently done a 4 blade prop, by creating a series of sections and lofting between them.

Hi
I copied the way to do it from this guys video

Made one blade and then used the circular pattern tool to make more blades

 

[petertha]

Are you referring to how the diffuser is driven

More what I'm wondering about is the gas flow through diffuser. Is it entering through the lower (yellow shade) array of holes, into the pie chambers & then flung out to the induction tubes? What does the (pink shade) opening do?

 

[michael-au]

More what I'm wondering about is the gas flow through diffuser. Is it entering through the lower (yellow shade) array of holes, into the pie chambers & then flung out to the induction tubes? What does the (pink shade) opening do?

All the holes go through to the vanes, so fuel would be able to pass through all the way around

 

[Peter Twissell]

Hi
I copied the way to do it from this guys video

Made one blade and then used the circular pattern tool to make more blades

Thanks.
The video shows a simplified prop with a flat section.
I used a similar method, but with a series of aerofoil sections of reducing thickness.
I then cut the model into slices, which I used as patterns to make wood laminations.

 

[michael-au]

I made a throttle lever and pivot bracket





The bracket was done with CNC so it was machined out of round aluminium bar and the parted it off in the lathe









The pivot pin and bolt were made from stainless, the bolt has a 2mm thread

 

[michael-au]

Started to work on the engine stand, this is made from 6mm plate alumiinium

 

[michael-au]

Made a couple of clamp straps to hold the fuel tank on to the engine stand




These will have a 2mm allan bolt to hold them and the fuel tank on

 

[michael-au]

Fuel tank is complete, I used copper tube and made aluminium ends and screw on cap

 

[michael-au]

Back brace for the side frames and the throttle lever are finished

 

[LuvToFish]

Question for you Michael. When you were drilling the valve cage holes for tapping, how did you gauge the tap drill depth? I don’t see an easy way to set this without making a special go / no-go gauge. TIA.

 

[michael-au]

Question for you Michael. When you were drilling the valve cage holes for tapping, how did you gauge the tap drill depth? I don’t see an easy way to set this without making a special go / no-go gauge. TIA.

I think from memory I used the spare cylinder as test piece, The threaded area of the valve cages on the plan is .313in long and the cages are flush with the top of the head, I just drilled down and kept checking the depth with a light and magnifier to see how close it was to the bottom, when I thought it was right I put a mark on the drill and also used the DRO
When tapping the hole I used the quill to keep the tap in line but only tapped about 3/4 of the way down and then when all the other work was done I I finished tapping the holes by hand with the cylinder off the fixture so I could seen in the bore and make sure the tap didn't cut all the way through

Maybe Littlelocos can shed some more light on how he did it

I found this was challenge

 

[LuvToFish]

I think from memory I used the spare cylinder as test piece, The threaded area of the valve cages on the plan is .313in long and the cages are flush with the top of the head, I just drilled down and kept checking the depth with a light and magnifier to see how close it was to the bottom, when I thought it was right I put a mark on the drill and also used the DRO
When tapping the hole I used the quill to keep the tap in line but only tapped about 3/4 of the way down and then when all the other work was done I I finished tapping the holes by hand with the cylinder off the fixture so I could seen in the bore and make sure the tap didn't cut all the way through

Maybe Littlelocos can shed some more light on how he did it

I found this was

 

[LuvToFish]

I think from memory I used the spare cylinder as test piece, The threaded area of the valve cages on the plan is .313in long and the cages are flush with the top of the head, I just drilled down and kept checking the depth with a light and magnifier to see how close it was to the bottom, when I thought it was right I put a mark on the drill and also used the DRO
When tapping the hole I used the quill to keep the tap in line but only tapped about 3/4 of the way down and then when all the other work was done I I finished tapping the holes by hand with the cylinder off the fixture so I could seen in the bore and make sure the tap didn't cut all the way through

Maybe Littlelocos can shed some more light on how he did it

I found this was challenge

Thanks. I’m at a point where I’ve drilled down most of the way but stopped short until I figure out a way to gauge the land thickness. I’m considering making a slot gauge with the width of the land. @littlelocos Any thoughts?

 

[michael-au]

The Engine stand is almost complete, just have to make a bracket for the remote needle valve

 

[michael-au]

The hall effect sensor is installed, connected the electronic ignition to test that it works, all good fires the spark plug ok

 

[LuvToFish]

Can’t wait to hear it running. You’re so close now.