Anybody want to guess---

[Brian Rupnow]

Did he drill the roll pin hole at an angle or did he go through the rim to get to the hub?

Chuck.

Chuck.
Next time I will be building the Webster I will make the flywheel with a taperlock. Why because I know :big:
I had a real backfire on one of the first startups, resulting the rollpin sheared :'(
Brian: it's not to late to make a taperlock for the flywheel methink. And it is so much easyer to set up the exh.valve timing.
Best Regards
CS

Crankshafter---Thanks for having a look at my thread. The taper lock hub MAY happen yet. What did you do for a carb and a piston ring? Do you have a thread where you posted your build, with pictures?--and maybe a video???----please----

 

[Metal Butcher]

And if you have ever drilled a flywheel like this, I don't have to tell you how long it took me, or how much my back hurt from standing there untill I was finished!!!

I know what you mean Brian! When I use the 'coordinate method' to locate and drill holes I go through some serious back pain. I have to stop after every hole and lean by back up against a nearby steel support beam, and try to massage some of it out before I can continue. I know, it sucks.

-MB

 

[Brian Rupnow]

Well, thats enough playing for today. If I don't somehow manage to screw this up during the final steps, I think its going to be pretty nice. And it does add considerable weight to the flywheel.

 

[crankshafter]

Hi there Brian.
Nice work as allways.
I use a OS-carb. and Viton-ring. I buildt a carb. for my Hoglet-project and I tryed it on the Webster, I can tell you that the Webster runs better than with the OS-carb ;D
I have a project-log here at HMEM but the pics, are delited????? :'(
Here are some pics. as reqested :big:

Best Regards
CS

 

[crankshafter]

Hi there Brian.
I forget to add. the video so here it is. Hope you enjoy. ;D



CS

 

[Brian Rupnow]

Crankshafter---That is really a beautifull engine that you have there!!! Did you record what number the Viton o-ring was, and can you tell me more about what an os carburetor is please.---Brian

 

[black85vette]

I use a OS-carb. and Viton-ring.

What size ring? How about the dimensions on the ring groove?

Great looking engine and box.

 

[crankshafter]

Hi again Brian.
I can't remember the sice of the O-ring, but it,s in metric. I converted the Webster to metric, you know it's easier here on this side of the pond ;D.
But I do remember I had to stretch the O-ring a little to have it fit right. After some hours runtime on it I still have the same good compression. But you have to have a near polished bore in the cyl. or else I think it will wear out the o-ring after a while me-think :shrug:
I will have a look at the OS-carb. to morrow and let you know.What I am certain of is that it is a barrel-type with a airblead port for easier adj. of the idlingspeed, I think you can use any carb. of this constructsion as long as it have the right barrel-bore, I will messure the bore to morrow. To be honest my good neighbor who is running RC-plains gave it to me so I I'm not sure what the OS parts no. is.
Until tomorrow......
Best regards
CS

 

[Brian Rupnow]

I will find time this week to get the info on the o-ring and the groove dimensions and post them here.---Brian

 

[Captain Jerry]

Brian

I sympathize with the back pain. I've had back problems for most of my life and the worst thing is standing in a slight bend. So all my tools are mounted for working while sitting on a chair. The only time I need to stand and bend is when actually running the lathe but I can do most of the setup while sitting. It may be an old man thing and it sounds wimpy but I can spend 8 hour days in the shop with no pain.

You have suggested this flywheel design before so I am happy to see you build it. It answers a lot of things like weight distribution, cost, and bling. Like you, I am rotab-less, so I would have to do it by the numbers. I have wondered if it would be accurate enough to maintain balance. Let us know about that after you get it finished.

Jerry

 

[Brian Rupnow]

Will do, Jerry. since I used the table dials to locate all the holes using ordinate dimensions as I moved the table, it should be very very close.

 

[crankshafter]

Hi Brian.
I've been in the cave and "hide and seek" and try to find The spare Vitonring have/had : but no luck if I had find it I cold have put it in a envelope and sent it to you, no problem.
I measured the throtlebore in the carb. barrel 4.3mm or .171"
OS is a manufacturer of RC engines located in Japan me think.
Here is the carb. I use on my Webster. Right at my thumb you see a small control-valve on the fuel-line. I made it for to prevent blow-back in the fuel-line/ tank it works very well and I will recommend you to make one. I used a 3 mm bearring- ball.
Had a talk with the Webster to night and we agreed to have a refuel and make some noise. Well, fired at first attempt :big: Fun? YES!

last pic. showing an other OS I have but with larger throtle-bore.

Hope it helps a little Brian.
Regards CS

 

[Brian Rupnow]

Well Dang!!! I'm impressed!!!

 

[black85vette]

Well Dang!!! I'm impressed!!!

Yeah. Me too!

Nice fit on the inserts and they look really good.

 

[Brian Rupnow]

Crankshafter---thanks for the pictures. I will find out some more about carburetors when I get that far.---Brian

 

[Lew_Merrick_PE]

But I do remember I had to stretch the O-ring a little to have it fit right. After some hours runtime on it I still have the same good compression. But you have to have a near polished bore in the cyl. or else I think it will wear out the o-ring after a while me-think :shrug:

If you are interested, I have a rather significant document on the design of o-ring glands (grooves) posted at http://www.scribd.com/Lew Merrick. I was on the team that wrote the "O-Ring Seal Design" section of the 1976 edition of the SAE Handbook.

 

[Brian Rupnow]

Lew--Thank you very much for the link. A lot of great information there.---Brian

 

[Brian Rupnow]

After a very busy week, I finally squeezed in an afternoon of "playtime" in my little shop ---and after many strange and wonderfull set-ups----

 

[Brian Rupnow]

I coaxed a rocker arm for my Webster out of a piece of brass bar. The design is different than the original, because the original was made from steel. I wanted to use brass, so I "added" a bit of material near the center where the shoulder bolt goes through,---Also, the fact that I have a couple of 1/4" shoulder bolts left over from a previous job had a bit to do with influencing my decision---

 

[Brian Rupnow]

Like this---