Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Hum should have two antenna's looks different too.





NEW Orange RX R410x 4channels receiver 2.4GHz PWM/CPPM
Compatible with DSM2/DSMX 1024/2048 aircraft radio and module systems
Diversity Antennas built in

1/2A Nut wrote:Nice Great flying looks like fun for sure!  

Perhaps you have a bad solder joint?  



Look what came in the mail today
A TD .15 aluminum carb body and two Killer Bee Cranks!

Friend!!!, thank you, I just got back from work and I'm enjoying a beer while I chat with you!
Good thing you like the video, I share this with you, here on the water ... all these models are made of own, have carbon reinforcement and carbon rods of controls, I paint them with airbrush!

there I see the crankshafts of the Killer! ... spectacular! I offer with you!

Another good vid thank you for sharing!! Yes cheers

I will get to the post office next week to mail it out with a tracking number.
Should be interesting to see if your engine produces more rpm!

1/2A Nut wrote:Another good vid thank you for sharing!! Yes cheers

I will get to the post office next week to mail it out with a tracking number.
Should be interesting to see if your engine produces more rpm!

Thank you friend for bothering and take your time to make this gesture.
It will be interesting to know the result, of course!

Brad, you build your models in a handmade way ?, I mean, cut them yourself by hand ?, if you are interested it would be interesting to see the construction of that model, in this case for your Killer Bee!

I use a electric jig saw as needed the thin ply for the fuselage will be hand cut with scissors.
When I start the build will post some progress photos of the process and parts used. I need
a testing platform that fits the Killer Bee back plate.

I put the high performance crank in another reed engine will need a Killer Bee prop plate and
thrust washer to fit correctly. Note the gap is too much with the original prop plate.

1/2A Nut wrote:

I put the high performance crank in another reed engine will need a Killer Bee prop plate and
thrust washer to fit correctly. Note the gap is too much with the original prop plate.

thank you !, I will keep in mind that important detail !!

Mauricio your Killer Bee Crank and spare thrust washer is on the way.


I have completed the upgrade of a spare reed engine with the proper prop thrust plate
and thrust washer. For the cylinder I am using a TD cylinder with SPI.
Also went ahead and bought a new KB back plate assembly with mylar reed. I do have
another spare light weight killer bee piston but it is being used for a TD engine.

Custom cut piston shorter skirt and thinned 2.8g requires using a non SPI cylinder as
the short skirt will then produce SPI.

Brad, this is a humble gift that I want to make and it's because of your huge gesture.
I made you a chomba, it's just the one we use in our club, this is for you Friend!
It has the logos, our flag and of course, I had your name engraved ... I hope you like it.
Just tell me where to send it ?!
Hugs !, Mauricio

That is too kind!!!

I would be honored to wear it, mind you I would wear a mens XL  I am 5ft 11"  
LOL I am scared to ask what size you have there? I had planed on buying a
high performance crank for my other reed engine and felt bad you did not have
one in your engine so bought two, just wanted to see you happy with yours and
most of all get the rpm out of it you deserve! Looks like a very nice shirt!

You have my address in the photo sent of the tracking # USPS Customs Declaration.

1/2A Nut wrote:That is too kind!!!

I would be honored to wear it, mind you I would wear a mens XL  I am 5ft 11"  
LOL I am scared to ask what size you have there? I had planed on buying the
high performance crank and felt bad you did not have one in your engine so
just wanted to see you happy with yours and most of all get the rpm out of it
you deserve! Looks like a very nice shirt! You have my address in the photo
sent of the tracking # USPS Customs Declaration.

I'm glad it's to your liking!
I'm sure it will look good on you, I've seen a photo that you shared that you're a great physicist, so I made sure!

Foto 1: 50 cm = 19.6"
Foto 2: 62 cm = 24.40"
Foto 3: 63 cm = 24.80"
Foto 4: 77 cm = 30.31"

Hehe think that will work!!

Lets hope all goes well with the shipping for the both of us!

Here is the pic of the two reed engines I have weighed them for comparison
the APC prop weight is a bit more than the carbon prop, longer hex head bolt
and spinner of course the throttle sleeve is there too. I will run the engine on the
left next to see what it can do with a throttle sleeve. If the engine runs ok will use
it in the field first for test flights with a reed speed plane once dialed in the rare
Killer Bee will be mounted on the nose and video recorded for the world to have
an example of a vintage KB in action.








AmpAbuser
Uploaded on Oct 13, 2017

Looking for any signs of vibrations with the Killer Bee crank and standard piston.
None to report if used with the .049 piston. Killer Bee back plate, prop plate. SPI
Tee Dee cylinder full size exhaust ports. Held a steady 7,105 rpm as the common reading.
Throttle sleeve was just close enough to create no visible opening. Break in run for
1/2oz will do a full throttle test with the common APC 4.2x4 prop for reference on Sat.

AmpAbuser
Published on Oct 14, 2017

Killer Bee Frame with TD Piston Sleeve APC 4.2x4
Best peak 19,460 rpm / 5.4oz thrust / .07hp / 52.2w / 74 mph
20% oil / 25% nitro. Med heat glow adapter plug has lower compression than cox HD plug.
SPI function exhaust sleeve still allows SPI to work. Should do 20k with HD plug
All parts are in stock from the Cox vendors, anyone can build one of these at this time.

Just put the Galbraith head / Nelson plug on this engine, big jump in compression.
Next will test my favorite carbon HQ 4x4.5 speed prop.




AmpAbuser
Uploaded on Oct 14, 2017

Best peak 24,740 / 7.1oz thrust / 106 mph / 93.3w
Nelson plug / 25% nitro / HQ Carbon 4x4.5 prop
SPI cylinder / the reed function was holding up so
a HQ 5" cut down to 4.5x4.5 should be just right unloaded
in the air for safe 25K rpm running busting 107 mph around
116 mph down wind. Now just need to take time to build
the Speedy Reedy.

Comparison to Lil Speedy

The large bulky back plate requires a bit more fire wall to mount the engine.

- The Lil Speedy is only 14.5" long.
- The Killer Bee weight is less than a TD.
- The Lil Speedy has flown well on TD .010 / .020 / .049
- Lands ok into the wind with the TD / wing is 17"x 4" for 66.4 Sq. In (due to aileron cut outs)
- Should be a floater with the Killer Bee engine. 20x5 tapered wing around 85 Sq. In.

Hey Brad , is that a Med Nelson plug alo in this real KB ? i know you said Med. on the first engine run with std. Piston. also how many Hd. gaskets please , Thanks ,Eric

I buy them from Larry Driskill the Nelson HD plug - NL02 plug which is considered higher compression but not
as hot as the other NL05 plug. The hot plug has a bigger hole drilled where the element goes so a bit less compression.
Here in TX the hot plug is not needed, that and I use enough nitro as it is. I use two shims for Galbreath adapters
and 1 shim for the other adapter. Element hole is .073" when viewing a Nelson plug you can tell if it's a HD plug
by the notches shown in the pic. First tests was done with a real May 31st 1995 Killer Bee shown with the drawing, the last
few tests is with a Killer Bee frame ie everything but the low weight piston and cylinder. So back plate, performance crank,
thrust washer and prop plate. I am using a stock TD .049 cylinder dual large bypass ports no flutes.

Thanks Man I looked into the adaptors and plugs i am guessing this is the Larry your refering too .. http://kittingittogether.com/index.php?p=home Not that bad a price for performance !!

Second one best suited just for the Killer Bee engine and TD should be very fast.
Other one could handle up to .07 size engines and up to 60cc tanks.

Eric, here is what I bought just the other day for two of my engines Larry takes paypal
Just email him let him know your pay pal handle he will bill you for what you want.
Expect average of 900 to 2k boost in rpm depending on prop type.

Seller info
Larry Driskill
larry@kittingittogether.com
Purchase details
KT50 (Qty 2)$24.00
NL02 HD Plugs (Qty 2)$10.00
Amount$37.50
Shipping$1.12
Total$37.50
View invoice details

Here is Larry's note with the product showed up today in the mail.
I now own 4 of these head adapters can highly recommend for
anyone wanting extra boost of power for their project. Not just
for speed use this will improve thrust too.



Big differences, the Nelson plug is not wrench down tight but can confirm it fits
flush once seated. Secrets why the Nelson plug out performance Cox High Comp plugs.

Do you have any tach values for the two heads?

Personally I have not seen that much of difference between the stock TD head, The Galbreath Nelson head or the Valentine Turbo head. It is only the adapters for regular glow plugs that one should avoid using.

Here is a little line up of heads to choose from (should add a TD head in that line-up too, and the Norvel inserts, plus the Merlin inserts...);

Instead of typed in unverifiable numbers and claims, how about a video!


Both high performance plugs are in good shape same engine / prop per this pic.
Will film the event Fri. using 25% Nitro / 20% castor.

Brad

I am also looking forward to seeing your vid an tach results. So far all my standard plug attempts resulted in serious loss of power in my 049 size COX engines . They overheat even with multiple gaskets under the head. I just find a plug way too much of premature heat input into the 049 cycle before ignition occurs and this - many of the readers here will find it too bookish but it is true - reduces the Carnot cycle efficiency...too much increase of compression work pushed into the gases (that warm up and have its pressure grow due  not to mechanical compression only  but also due to getting additionally heated by the plug) that is much further away from being adiabatic with a large plug than with the stock head (sorry again for theorizing here).