Texaco duration slow race

This thread took off!

So it looks like there is interest.

From the comments:

1) Set up 2 classes - 5cc Texaco Jr, and 8cc Texaco
2) Determine when the clock starts. I was thinking get the engine running and then refill the tank and start the timer. Thoughts on this approach?

3) Fuel used: SIG Champion 15% nitro
4) Cox grey 8x4
5) Any cylinder combination can be used
6) Limit to tanked engines only? They are consistantly the same volume so it would be fair for all that way unless someone hogs out a tank to be wafer thin toi increase volume.

I don't think there should be any expert or novice classes. Just the 5cc and 8cc class for simplicity sake.

Need to set a date for this. May is out for me as my weekends are all used up. Either mid April or sometime in June.

I am good with tanked only, never thought about removing material to holld more fuel. Thanks for the idea! (just kidding)

April or June works for me.

Are we doing duration or slowest RPM? Actual or Virtual?

duke.johnson wrote:Wish I had a Texaco.

Texaco II
http://coxengines.ca/cox-.049-engine-texaco-ii.html

Texaco Jr. II
http://coxengines.ca/cox-.049-engine-texaco-jr.-ii.html

WingingIt74 wrote:Are we doing duration or slowest RPM? Actual or Virtual?

Slowest RPM should be accounted for too.

I would suggest to video the entire engine run, then use the video time to figure the duration. If you have more than one camera and test stand you can run multiple entries at the same time.

If you have a dozen engines to run, 7+ minutes of duration expected, this makes for a long time.

Phil

Well I'll be darned Phil, they really do run 7+

I have a Texaco that I have never ran and decided to fire it up after you said they would run over 7 minutes. I didn't have a Cox 8x4 so I used a TF. It ran 7:18! Probably would have run longer as it took a while for the old goo to cycle out and I had to fiddle with the needle.

Pretty cool little engines.

They are cool little engines. Jeremy is going to build be a RC plane for mine.

WingingIt74 wrote:They are cool little engines. Jeremy is going to build be a RC plane for mine.

It would make for a lovely little floater. Think it would throttle well?

I don't think I'd worry about a throttle. That test we did last weekend, I think, went well.

WingingIt74 wrote:I don't think I'd worry about a throttle. That test we did last weekend, I think, went well.

It did look cool, I've always liked hovering into the wind. If I ever get over the CL bug I would like to make something for my Texaco.

Ron

20-fin you say.... You have a special glow clip for that? You planning on swinging a Hartzell or McCauley prop?

WingingIt74 wrote:

20-fin you say.... You have a special glow clip for that? You planning on swinging a Hartzell or McCauley prop?

Waiting for someone to point that out! Just solder a little piece of insulated wire to the contact post on the insert and have it extend out the top of the head body.
With your prop choices, you would need a much larger prop spacer!

Jason_WI wrote:
6) Limit to tanked engines only? They are consistantly the same volume so it would be fair for all that way unless someone hogs out a tank to be wafer thin toi increase volume.

Measured amount of fuel going into tank (say 7.5 & 4.5 cc)? : eliminate differences in runtimes due to inadvertently over/under filling tank. Wouldn't be surprised if differences between plastic and metal backplates affect capacity, too.

ahrma_581 wrote:

Jason_WI wrote:
6) Limit to tanked engines only? They are consistantly the same volume so it would be fair for all that way unless someone hogs out a tank to be wafer thin toi increase volume.

Measured amount of fuel going into tank (say 7.5 & 4.5 cc)? : eliminate differences in runtimes due to inadvertently over/under filling tank. Wouldn't be surprised if differences between plastic and metal backplates affect capacity, too.

Never thought about that, that's a good way to fix the variable.

You could carefully fill the tank and see what it holds then after needling top it up for duration. After the run divide the duration by volume for the score.

I suspect the volume will be rather similar for all the engines though.

Phil

I think the duration would be a pain to do... to be honest. I think the slow tach race would be the way to go.

WingingIt74 wrote:I think the duration would be a pain to do... to be honest. I think the slow tach race would be the way to go.

I'm inclined to agree with this
Phil

I think I have an engine to run in this. I just need the correct prop so I can tune it.

It is an old baby bee with a "Thimble Drome" fuel tank on it.

Phil

Has Jason firmed up the rules yet? I think he has been busy with his latest Ebay haul.

Nothing is set in stone yet. The more I think about how to be fair with a duration race I think I will just limit this to the slowest RPM acheivable on a Cox grey 8x4 prop and 15% Sig Champion fuel. The duration part of the race could take days to complete if many engines were sent in. This way there is no need to have a specific size tanked engine.

2 classes can be held then. One for completely stock engines like the Babe Bee, Golden Bee, Texaco, Texaco Jr, Venom

The other class for modified engines with custom intake venturi sizes, cylinder types, crankcase types (car)

NO throttle rings allowed!

So no exhaust restriction or just no adjustable throttle rings?

Phil

Exhaust restrictions would have to be fixed in place somehow. Could use a Tatone muffler and plug the exhaust hole up but this would remain in a fixed position. There is no way to have an ajdustable throttle ring that moves around. It has to be fair to everyone.