AndyW

My Feedback: (1)

Thanks, I appreciate that and I can, I really can, imagine how hard that is. Life is what it is and with the help of good friends, this forum and family, we survive and carry on. Just got to get off the damn drugs. Mostly sleep problems. One solution is to just stay up and work in the shop till you drop. Gotta get my old, tube, AM radio going with the long antenna to pick up all the late night, 60s and 70s music. Wish there really was a WKRP.

About the Picco .06 gasser, it's bagged and I'll be having another look at it this summer. Power, as I recall, was way down, maybe more compression, maybe a carb swap. I may try more/less oil.

AndyW

My Feedback: (1)

OK, back to the OS .15. I let it sit in the anodize jar for over an hour and it got a nice, even dark grey. Now that's more like it.

However, performance didn't improve. What it needs, I think, is a bit more run in. The piston definitely had more drag when I set it into the liner. Plus, I get a healthy snap over when still hot,,, it didn't do that before.

But it's not really looking good.

Next up will be the early, Norvel .06 AAN engine. The Norvel piston material seems to respond better to the anodizing trick. We'll see, on a separate thread.

Cross Check

Hi Andy,

Thanks for the experiments !
You have inspired a,
Annoded
Cathode
Pale Ale


My Postmaster, suggested a stronger box, to send the package safely. (Tues, 28th)
Snagged some cardboard. He also said Mon/Tues is the best to send things.
Busy week ensued. I'll sent it Monday May 4th.
Consider it a older vs newer .15 project...
You are very cool at, 'these' things Andy.

I really enjoy what we, have learned from from you...

Take care,
Have fun,
Dave'crosscheck'Fallowfield
Maac 6437
Unabashed Combat Team

Cross Check

Hi Andy,

I'm biking to 'work' at the brewery in 10 minutes. PostOffice is on my way.
Should be 'outbound' by 4PM. (May 4th)
I'm curious how long it will take to get there.

I made the Box 'reusible', so when you 'AndyW' them, you can send them to whoever you want.
(I like the people here, on this site here.)

Take care,
Have fun,
Dave'crosscheck'Fallowfield
Maac 6437
Unabashed Combat Team

Cross Check

Hi Andy,

On it's way ! I hope you have some fun !

The OSFP.15 has a homemade 'carb nipple' to make the NV remote and more "Combatworthy"
It has never been run. Check if the muffler baffle is out !
A 'spare' I would run, but my others, I'm trying to wear out.(It is tough to wear out an OS !)
Cool engines, I'll bet you can improve over stock, Andy !

I could divulge more clues on the 'Mystery' 70s era engine...

I would rather Andy,
Wait for Canada Post...
Just like the rest of us !
Cheers !

Take care,
Have fun,
Dave'crosscheck'Fallowfield
Maac 6437
Unabashed Combat Team

aspeed

Early shnuerle? ok my guess is K & B . Don't think anyone would give away a Rossi or anything Italian.

AndyW

My Feedback: (1)

Thanks Dave, in big fat bunches. I've been having trouble logging on to RCU all day. Madame Insomnia prompted me to give 'er a go, 3.30 AM and she was right,, all fixed now.

AndyW

My Feedback: (1)

Awww, why n-o-o-o-t ?? But hey, maybe Dave's in a manic mood,,,

K&B would be OK, though. They made some killers in those days. Whatever, a gift is what it is, no matter WHAT it is. You can NEVER have too many engines.

Gracias, Amigo. dziękuję, danke, merci, спасибо

AndyW

My Feedback: (1)

Got the parcel late this afternoon. I know the FP, but what the heck is the other one? There's a T on the side of the engine, Thundertigre?

Can anyone guess?

In any case, 3 days via Canada Post is pretty good.

Thank you Dave, they both will get the once over. I'll run each on the 8 X 6 APC. I might also run a NIB, Norvel .15 just for fun.

Making this more difficult though, is that my very handy engine, bench mount stand has gone missing. My shop is small, tight and cluttered and sometimes I'd hang the mount on the edge of the garbage can temporarily while I put stuff away. I'm horrified to think that I tossed it out. Aaaaargh.

proptop

My Feedback: (8)

The rear exhaust with anodized head looks like a Taipan and IIRC that colored head means a high performance version?

I don't know much about them, but I've seen 'em before...Hobby Shack used to sell them over here in the U.S. back in the 70's

http://modelenginecollecting.com/Eng...er-Taipan.html

Edit: scroll all the way down in the above link

aspeed

I have one, it is a Taipan. good fast motor. I would not put anything over a 7" prop on it, maybe an 8-3" tops if that would ever be needed. For power it is right up there with the Rossi and other wonderful stuff. Dave must love you.

AndyW

My Feedback: (1)

That explains the 7" prop he included. And yes, further inspection of the backplate reveals Taipan Made in Australia. Is that 'muffler" tuned? Dave?

AndyW

My Feedback: (1)

Maybe I'll make a diesel head for it.

AndyW

My Feedback: (1)

BTW, Taipan always was innovative and creative. Most props don't carry true pitch all the way to the hub but Taipan props did and they were very strong pulling props. Didn't scream, size for size but sure did haul the freight.

combatpigg

My Feedback: (3)

That Taipan deserves to be put on something fast...!
APC makes a 6.5 x 6.5 that would really honk on the right plane.

Pond Skipper

Might be a 1/4th wave pipe, if so it is optimized for a given rpm range with a bleeder gate at the top for excess?

AndyW

My Feedback: (1)

Yeah, an upsized Tsunami would really allow the Taipan to go like stink. Just wish my park was bigger by aboot three times.

Pond Skipper,, 1/4 wave eh. I'll bet it wails. I'll have to run her on the bench before my neighbour moves and I have to come to some kinda understanding with the new folks. Maybe an 8 PM curfew and no Sundays.

Mr Cox

I think the muffler is a just a muffler that looks good, but I don't have any of these my self, unfortunately....

The nipple near the cylinder is for a direct priming of the piston, you have a full test report by Peter Chinn here; http://sceptreflight.net/Model%20Eng...ld%20Head.html

Pond Skipper

Good find, Chinn makes a description of it as a foreshorten tuned pipe with divergent, convergent cones so 1/4th wave with the direct expansion of the exhaust gasses then leaving the pipe immediately.



more modern example would like to try a 1/2A version.



And Daves Parra .15 side mounted version

Mr Cox

I don't think that you can have a restriction at the end of a 1/4 wave pipe. There needs to be an anti-node there, or it wouldn't be called a 1/4 wave pipe.
So they tend to be just straight tubes, like the ones frequently used in QM racing.

I have seen the Parra engines but I don't have any of them myself. I assumed that the muffler was mainly a optimized development to stay within combat rules, but I don't do any combat flying myself either.

I guess there could be some type of resonance effect at work, but is there really a net gain over an open exhaust on the Parra engines?

aspeed

I think it was built for the quarter midget racing in the day. Likely there was a length restriction of 6" or whatever to stop the use of tuned pipes, or megaphones. It may do some good. The Fora type mufflers are really just a light excuse for a muffler with a 6mm outlet to fit the rules, only lately have there been major attempts at really improving rpms. At 35,000 rpm they can be quite short anyway.

Cross Check

Hi Andy,
Glad it got there !

It is a muffler, not a pipe. The stinger unscrews. Came with two. The smaller one was lost on its only flight.
I've mostly run it without the stinger, breaking it in.

Got noise complaints last bench run. Needles and carbs great. Definately happier on the 7-6.
(~ 30oz of 15% half castor fuel through it)
When I popped of the fuel line to run it dry, it spooled up nice to say, I want to go ! ! !
I ATF'd it while it was warm.

More later, work ensues,
Doah !
Crosscheck

Cross Check

Mr Cox,
Thanks for posting the Peter Chin review of the Taipan.15 R/C....
It says it all... until...
Andy compares it with an OSFP !

No hurrys, no worrys, Andy.
Just have fun.
It is what our hobby is about.

Educating people, about that RPM wail...
And, that sweet Castor smell...
Is, Priceless...

Cheers,
Dave'crosscheck'Fallowfied
Maac 6437
Unabashed Combat Team

AndyW

My Feedback: (1)

Dave,

You know, there was something unique about Cox,,, I think it was called Super Fuel, that truly had a sweet castor smell. I remember it well some 50 years ago, when I first lit off that Babe Bee in the middle of winter in the basement. For one thing, I had never seen an engine run before so the noise was quite a shock. My Dad came running down the stairs and tossed a rag into the prop. I stood there like a dope not having any idea as to what was going on. The fuel was confiscated till the spring so I spent the winter taking the engine apart and re-assembling, time and again.

Crank, conrod, piston and cylinder. The basics, all conventional engines have them.

The question is, if so, what is it that distinguishes a Taipan .15 from an LA .15,,, or FP. Why is the Norvel .15 a bit of a dud.

So is it timing, compression seal, compression ratio, long versus short stroke, rod length. Of course it's a combination of all of the above. And maybe a bit of magic dust thrown in for good measure.

So running all four, LA, FP. Taipan and Norvel will be an ongoing, summer project. Maybe the Norvel just needs a single tweak to make it come alive.

Glad to hear that it's just a muffler on the Taipan. I'll be getting a new neighbour soon and they may not be as tolerant as the last. It would be a great bit of luck if that new neighbour was a modeler,, or even nitro car guy.

I have a place I can run them all, open exhaust and that may tell volumes,,, so to speak.

Again, thanks Dave,,, now if only I could find that test stand.

Cross Check

Hi Andy,

Open exhaust is fair ! It is a old/new shootout.

I wanted to figure out how to get the back 'cone' off.
Dremel it out to a Trumpet...
And really piss off the Nieghbours !

Your project Andy,
Take your time.

Cheers,
Dave'crosscheck'Fallowfield
Maac6437
Unabashed Combat Team