Speedring Cowl for a Rotec - Possible Group Order?

johnkerr · Post by **johnkerr** » Fri Nov 18, 2016 1:37 pm

The notion of some sort of bracket that bridged from collector ring to oil hose or fitting is worth noodling. Maybe taking advantage of the collector ring attach points for primary attachment.
Still exploring and searching other ideas.
How about the total reverse of the H&S approach and have the major bracket attach to the ring and engage the entire head lube system

Again mounting is to me the larger question on this winter project.

HC85 · Post by **HC85** » Sun Nov 20, 2016 12:47 pm

dougm wrote:Well then, remove the agony and go for the Rotec!

If we had 5 people the math would be:
________Cowl__Tooling__Total
5 people: $375 + $695 = $1070/ea

just sayin'

Okay, I'm in.....couldn't stand it. I sold my O-320 and will commit to a speed ring group buy, whichever source.

Rick

dougm · Post by **dougm** » Sun Nov 20, 2016 10:59 pm

Great! I've been trying to get the speed ring drawing done, but the guy has back-burnered me. I'm looking for another CAD person. Hang in there folks. I should have this resolved soon and then I can get back in touch with the company about spinning the rings.

I have some examples of mounting systems. I'll follow up with a separate post here to show those.

johnkerr · Post by **johnkerr** » Mon Nov 21, 2016 1:14 pm

30” diameter, 4” radius, 5” deep $70

34” diameter, 4” radius, 5 ½” deep $80

34” diameter, 8” radius, 10” deep $100

39” diameter, 8” radius, 10” deep $120

42” diameter, 8” radius, 10” deep $150

This is the pricing for "standard" rings from Dick Hartzler. The 34" diameter, 8" radius seems close.

What is the difference? Wire wrapping inner circumference, folding rear edge?

Bitshifter · Post by **Bitshifter** » Mon Nov 21, 2016 5:57 pm

I used the 34" dia. 4" radius as a cowl for behind the engine and in front of the firewall. My plan was to use the 34" dia. 8" radius as a blank for a bump cowl, pushing it back until the valve covers stuck through the 8" radius. I was then going to make 18 covers that would be the bumps where the valve covers came through. I changed my mind and decided it would be easier to make the bump cowl out of composite but I also toyed with the speed ring idea. I think that the 8" cowl would work as a speed ring but it would need to be cut along the front side and then rolled back. This would be hard but not impossible. The cowl comes rolled from a solid sheet so it looks like a 34" bowl. To be useful the flat section in the center needs to be removed. I made a form and cut and rolled a hole in mine to clear where the engine mount comes through. it took a few days to make a wood form with two pieces of 3/4 inch plywood and a router. To use as a speed ring the section removed would extend into the radius section so the wood form would need to be much bigger.

: HatzCowl2.jpg (66.84 KiB) Viewed 4220 times

dougm · Post by **dougm** » Mon Nov 21, 2016 6:23 pm

The rings provided by Dick Hartzler are intended to be used as the front portion of a full cowl, not a speed ring. The shape is very different. As Ed points out, it is probably possible to modify the ring and turn it into a speed ring, but that would require a fair amount of metal working. I don't have those skills and I would like to find a source where we can get consistent copies made. Incidentally, the company that produces Dick's rings is the same one I've been in contact with about making the speed rings.

stearmoth · Post by **stearmoth** » Tue Dec 13, 2016 6:44 am

Hi Rotec Hatz buffs!

We received a new inquiry for a Rotec speedring (also from USA) and I thought, I might spread this theme:

Just to let you know, that there still is an opportunity for manufacturing Speedrings with mounting hardware for attachment to special rocker covers (these could also be made available).
The goal is to catch at least 6 orders for a production run for the rings. The earlier given price of about $ 1800.00 is meant for a fine grid sandpaper finished (ready for polyshing and ready to mount including mounting hardware except the special 4 rocker covers needed.
Of course, it would also be possible to supply just the raw spun speedrings without fine sanding and some of the mounting hardware for less money. In this case the builder has to attach the mounting hardware himself. That price has yet to be determined if anybody is interested.

How many prospective builders would be interested in that Aeroplaneworks speedring?

Looking forward to any replies....

Hans & Sam, H.C.#78, Switzerland

ssearle · Post by **ssearle** » Thu Dec 15, 2016 8:06 pm

[quote="johnkerr"]Doug, could you post some information on the Waco mounting method? Per Ed's comment and the decision chain Hans & Sam have followed it appears that mounting is a larger issue than obtaining the "ring".
So far, all I've come up with is spiderweb of braces attached to the motor mount.

Hi John and Ed
Here are some pictures of mountings for Waco engines - both cowl styles with 300 hp Jacobs engine.
I have one more picture to come.
Read the picture comments for details of what each picture shows.
Hope this helps!
Steve SN162