Cox Engines Forum
You are not logged in! Please login or register.

Logged in members see NO ADVERTISEMENTS!


Super Super Bee Cox_ba12




Super Super Bee Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» Introducing the new - "QZ" RR-1
by Boats13 Today at 10:19 am

» STUKA bomb dimentions needed
by latole Today at 9:36 am

» Indexing COX cylinders
by davidll1984 Today at 7:56 am

» Another of C.T. engines cleaned ---- Cox Tee Dee .09 --- Just today (3/26/2024) more Cox parts
by Yabby Today at 7:47 am

» Introducing our Cox .049 TD Engines
by Yabby Today at 6:33 am

» 1/2a Skyray plans?
by 944_Jim Yesterday at 10:14 pm

» Postage stamp backplates
by JPvelo Yesterday at 8:52 pm

» my attempt at making an exhaust throttle for Cox .049
by roddie Yesterday at 8:20 pm

» Cosmic Winds, - Big Guy, Little Guys, Silver Guy and Wounded Guy.
by rsv1cox Yesterday at 5:18 pm

» My friend Ramón, his Cox .09 & Cox .010
by MauricioB Yesterday at 12:31 pm

» Parts Cox TD-4
by rsv1cox Yesterday at 8:40 am

» On ebay a very special Cox engine
by davidll1984 Yesterday at 6:32 am

Cox Engine of The Month
March-2024
balogh's

"COX Budapest" .049 engine



PAST WINNERS
CEF Traveling Engine

Win This Engine!
Gallery


Super Super Bee Empty
Live on Patrol


Super Super Bee

Go down

Super Super Bee Empty Super Super Bee

Post  Controlliner Sat Oct 15, 2016 6:41 pm

My Super Super Bee. Killer Bee power head. Tank extender copied from a Kavan kit. The engine runs about 9 minutes on a 6X3.Super Super Bee 05313
Controlliner
Controlliner
Bronze Member
Bronze Member

Posts : 34
Join date : 2016-08-24
Location : Canada

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  crankbndr Sat Oct 15, 2016 7:09 pm

Nice one! That engine is as long as John Kerrys face! How did you make the extention?
crankbndr
crankbndr
Top Poster
Top Poster

Posts : 3058
Join date : 2011-12-10
Location : Homestead FL

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  Controlliner Sat Oct 15, 2016 8:06 pm

took a super bee tank and turned it down with the same grove and tongue fit as the original tank and back plate set. the venturi extension is from 6061 t6 bar stock. Intake ID is drilled a #43 drill.
Controlliner
Controlliner
Bronze Member
Bronze Member

Posts : 34
Join date : 2016-08-24
Location : Canada

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  Oldenginerod Sat Oct 15, 2016 11:44 pm

Looks like a contender for the next Cox Engine of the Month Thumbs Up
Oldenginerod
Oldenginerod
Top Poster
Top Poster

Posts : 3962
Join date : 2012-06-15
Age : 61
Location : Drouin, Victoria

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  getback Sun Oct 16, 2016 7:28 am

Nice extension , you did a heck of a job . You machinist are something // what is the weight on the engine now ?" Small Cox Logo
getback
getback
Top Poster
Top Poster

2022 Supporter

2023 Supporter

Posts : 10028
Join date : 2013-01-18
Age : 66
Location : julian , NC

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  Controlliner Sun Oct 16, 2016 8:47 am

I want to submit for next month contest. Yes, I am a machinist. I want to take a car engine crank case and make an oil lite bushing to fit and use a killer bee crank shaft. I know there won't be any gains, but is would be cool to have a bushed crank case.


Last edited by Controlliner on Sun Oct 16, 2016 9:03 am; edited 1 time in total
Controlliner
Controlliner
Bronze Member
Bronze Member

Posts : 34
Join date : 2016-08-24
Location : Canada

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  Controlliner Sun Oct 16, 2016 8:48 am

getback wrote:Nice extension , you did a heck of a job . You machinist are something // what is the weight on the engine now ?" Small Cox Logo
I will weigh and post.
Controlliner
Controlliner
Bronze Member
Bronze Member

Posts : 34
Join date : 2016-08-24
Location : Canada

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  Controlliner Sun Oct 16, 2016 9:01 am

Super Super Bee 05611
Super Super Bee 05711
Controlliner
Controlliner
Bronze Member
Bronze Member

Posts : 34
Join date : 2016-08-24
Location : Canada

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  getback Sun Oct 16, 2016 9:07 pm

Not bad for the almost 2 times the run time , would certainly bee nice for a RC lite weight Skylane or so Eyebrows  i just happen to have one new in the box from way back then lol! Just seems the faster i go the less i get done Rolling Eyes You have any plans for that extra run time controlliner ?
getback
getback
Top Poster
Top Poster

2022 Supporter

2023 Supporter

Posts : 10028
Join date : 2013-01-18
Age : 66
Location : julian , NC

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  Controlliner Mon Oct 17, 2016 4:43 pm

I've used it in an Ace Grasshopper. Sweet run times and you should hear it in a dive when it unloads. I would love to get that kit again.
Controlliner
Controlliner
Bronze Member
Bronze Member

Posts : 34
Join date : 2016-08-24
Location : Canada

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  roddie Mon Oct 17, 2016 11:33 pm

Controlliner wrote:took a super bee tank and turned it down with the same grove and tongue fit as the original tank and back plate set. the venturi extension is from 6061 t6 bar stock. Intake ID is drilled a #43 drill.

That is quite nice work there! I'm familiar with that Kavan tank-extender. Given an existing 8cc tank.. Huh... how were you able to obtain 2-56 case-screws that were long enough? Did you use couplers with threaded-rod? That method would likely make the screws captive to the backplate. Not a bad thing. Are the screw-heads the stock slotted-Fillister.. or did you opt for a different head-config./mat'l.?

I would guess the venturi-extension only .. to be drilled to an .089" ID.?? Is there a gasket used at the juncture of the tubes? Maybe I'm seeing it all wrong.. sorry if so. Is there a taper or relief-radius where the two tubes would connect? I'm unsure as to your engines' venturi-size prior to re-work, but I'd say it was at maximum; .082". Any larger than that.. and fuel-feed issues can arise if using a standard suction-feed.. or so I've read. Your engine obviously doesn't suffer from those issues; yielding such long runs! Kudos to you.. for making everything airtight... Heck.. maybe you can run a larger ID venturi tube in a Bee.. if the tube is lengthened? That might make physical-sense.  Shocked Where yours is internal to the integral-tank/extension.. you can still mount the engine conventionally. I have to wonder if an air tube-extension through the firewall would help a 5cc (Babe-Bee) engine breathe.. if it's venturi-tube was drilled-out larger?

Easy experiment; the Bee's Air-intake is on-center with all mount-holes in the backplate. Make a test plywood-firewall/bench-mount.. and mark/drill holes to mount the backplate.. plus a "center hole" for your air-tube. Face the firewall with 1/8" thick closed-cell foam padding.. and locate/pierce all the holes with an awl. Install your "extended venturi-tube through the firewall/foam.. then mount the engine. The foam-pad will fill/obstruct the "V-shape" stock air-intake passage in the backplate-casting.. the air-tube will self-center.. and the engine will suck-air through the tube-dia./length that you provide. The little screen can be popped-out with a sewing-needle for when you drill-out the backlplates' air-hole. This could make for some interesting tests.. and also be non-destructive to stock-operation; utilizing a short-length/stock-size air-intake. Document it with your engine-running files.. same as you would for a given propeller; cylinder #/porting, shims, SPI/non-SPI,  plug-type/compression-shims, head or insert.. heat-range.. reed-type/retainer, fuel feed-line size/orientation-position... and whatever-else you figure can vary. Weather..

I love this stuff..! I'm a big fan of "make it your own".

In closing.. I'd like to bring-up the CEF Tach-race. I need to read the rules concerning Bee-class engines.. and see if there's a modified-class. The hop-up mentioned above would require mailing the entry-engine mounted to a firewall containing the air-tube.  Smile  but that's about it. I believe it's a "run it as you receive it" thing at the CD's test-site.. but I don't know about having a mount that's dependent on the firewall. The firewall is not an integral engine part.. but the air-tube running through it could be considered as such. The CD is only required to prime/fuel the engine until running.. and needle for sustained-peak rpm. I believe this procedure to be applicable to "all" categories. (please correct if mis-stated)

One last query; ...............  Smile  the reed-style you used?  The wire e-clip is the std. reed-retainer for the integral Bee tank. I prefer running the original .001" star-shaped Copper/Beryllium reed.. but members here replace it with the thicker .005" Mylar reed. Apparently the thin Copper-reed will "float" at a lower rpm.. compared to the thicker Mylar. I continue to be concerned with the extra .004" thickness of the Mylar reed.. as well as its' oblong/oval-shape. Its' flex properties are different.. the e-clip/retainer gap is different. Furthermore; the oval/oblong shape is "less" symmetrical to intercept the mixture coming-down the venturi-tube. I digress.

I'm sorry.. I have a bad habit or thinking too-far "outside the box"... but putting my foot in my mouth even further; there's a Cox .049 endurance/duration thread lurking recently. If C/L flying a Cox .049 for 9-10 minutes doesn't phase you.. you might like the conversation!

Here's the thread..

https://www.coxengineforum.com/t10172-cox-049-endurance-record
roddie
roddie
Top Poster
Top Poster

Posts : 8156
Join date : 2013-07-17
Age : 64
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  Controlliner Thu Oct 20, 2016 2:13 pm

The 2X56 tank screws are from a piece of CC130 Avionics, they were just the right length. The screws are slotted.
The venturi is drilled all the way through with a #43 drill. The venturi extension is machined male on one end and female on the other end with the exact dimensions as the tank and tank back respectively. I use two OEM "O" rings to seal each end as you would expect. The tank extension is between the original Super Bee tank and the backplate. The joints are sealed with epoxy as this is impervious to any nitro content in glow fuel. This alleviates any leaks in the usual areas. The Reed is the .001 beryllium OEM reed. The fuel pickup is on the bottom for R/C use. I could use this for Ukie but the nose moment will be pretty long and balance is pretty hard to achieve.
Controlliner
Controlliner
Bronze Member
Bronze Member

Posts : 34
Join date : 2016-08-24
Location : Canada

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  roddie Thu Oct 20, 2016 7:35 pm

Thanks for the info.! So.. the "extension-tube" is removable with the backplate, for changing the inner O-ring if needed? That's pretty cool.
roddie
roddie
Top Poster
Top Poster

Posts : 8156
Join date : 2013-07-17
Age : 64
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  Controlliner Fri Oct 21, 2016 4:45 am

Yep.
Controlliner
Controlliner
Bronze Member
Bronze Member

Posts : 34
Join date : 2016-08-24
Location : Canada

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  KariFS Fri Oct 21, 2016 5:19 am

roddie wrote:Thanks for the info.! So.. the "extension-tube" is removable with the backplate, for changing the inner O-ring if needed? That's pretty cool.

I took the liberty of borrowing Overlord's picture of a Kavan tank extension kit. The Kavan kit also came with an extra O-ring and longer tank screws (which by the way are just a bit longer than "ordinary" Cox 8cc tank screws so beware). Anyway, this pic may clarify the idea.

Super Super Bee Imgp0410[/quote]
KariFS
KariFS
Diamond Member
Diamond Member

Posts : 1993
Join date : 2014-10-10
Age : 52

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  OVERLORD Fri Oct 21, 2016 7:05 am

I recently acquired a new aluminium tank extension. I suppose it was also made by Kavan as it has the same length as the plastic extensions, but I'm not sure. Unfortunately, I got only 2 bolts with it.

Super Super Bee Imgp1115

Super Super Bee Imgp1116
OVERLORD
OVERLORD
Diamond Member
Diamond Member

Posts : 1775
Join date : 2013-03-19
Age : 57
Location : Normandy, France

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  KariFS Fri Oct 21, 2016 7:38 am

I wasn't even aware that such a kit existed in aluminum. Anyway, Lieven, many of my Babe Bees have come with a tank extension, so if you want some extra screws, I can send you a set. Just pm me your address and give me a few days Smile
KariFS
KariFS
Diamond Member
Diamond Member

Posts : 1993
Join date : 2014-10-10
Age : 52

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  Controlliner Fri Oct 21, 2016 9:23 am

Me neither. I knew there were black and red ones but not aluminum. Mine is about .125 longer than the Kavan one. I like the way the extensions are plastic and they seal well but I never liked the way they would bulge, always afraid they would crack.
Controlliner
Controlliner
Bronze Member
Bronze Member

Posts : 34
Join date : 2016-08-24
Location : Canada

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  Ken Cook Fri Oct 21, 2016 3:55 pm

The early versions from Kavan were aluminum. I tried them and was never satisfied with using them. I found it very difficult to keep the screws tight as they needed constant attention. The engine would rotate, leak, etc. I found it much easier to provide a external tank via production backplate or drilling a hole in the side of a tank.
Ken Cook
Ken Cook
Top Poster
Top Poster

Posts : 5414
Join date : 2012-03-27
Location : pennsylvania

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  roddie Fri Oct 21, 2016 7:09 pm

Curious if you happened to gage the length of the extension-tank to those 2-56 screws from the avionics unit? The stock Bee case-screws have a "Fillister" head. That type screw-head might help to torque-seal the Mazak backplate. I'd like to find Allen-head screws to fit. They may protrude.. but one could always shim between the firewall/backplate.. plus providing for more air into the engine. With your .089" venturi-diameter, you might need more air than the slot in the backplate can ultimately provide. Then there's the question (running flush to the firewall) of whether you're taking full-advantage of enlarging the venturi. More air-flow from the firewall could necessitate a pressure-feed. Another non-SWAG on my part Laughing is that you're possibly seeing an increase in flow-velocity by using a longer tube; albeit of a larger diameter.

I tried making a simple bench-dyno.. using a digital luggage-scale and floating engine-mount for a small 1 gal. water-tub. It allowed for a baseline static-measurement of power... once the engine was in "tractor-mode"..

These vids are purely for entertainment purposes only.. Laughing

https://www.youtube.com/watch?v=Fb-j6yjqfXk


https://www.youtube.com/watch?v=Gcj3yjUSdr4


Below is page "two" of a thread I started for building engine-dynos. It Segues from a "beam-style" to the buoyant-design.

https://www.coxengineforum.com/t6212p25-dynomometer-build-for-air-screws?highlight=a+dynomometer

The stock engine averaged 12.5K on that prop and pulled 5oz. dead-weight. I haven't tested any other combinations yet.. but I made alternate-mounts for radial vs. beam mounting. All are a straight/level pull on the scale.

It was a cheap and interesting project.. but was met with a good degree of criticism. Neutral




roddie
roddie
Top Poster
Top Poster

Posts : 8156
Join date : 2013-07-17
Age : 64
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

Super Super Bee Empty Re: Super Super Bee

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum