Author Topic: Another Dewey Cox (Read 1550 times)

Larry Lindburg · « **on:** December 10, 2011, 12:38:22 PM »

I finally finished another Deweybird that I started over three years ago. Babe Bee power by Cox.

Tim Wescott · « **Reply #1 on:** December 10, 2011, 01:16:34 PM »

That looks very nice. I have some questions, though:

What size is the tank, and how long (do you know) of a flight does it make? (And is that a reall-o truely-o Babe Bee with the single-bypass cylinder, or is it hot-rodded?).

What did you use for paint?

Larry Lindburg · « **Reply #2 on:** December 10, 2011, 05:38:30 PM »

The tank is a BH-507 Brodak/Perfect which is 2/3 ounce. This setup will yield about 5 minutes on 25% Sig Champion fuel. The prop is the 5-3 Cox stiff prop, and this Babe Bee did about 15500 rpm on Sig 15% during testing.

I am not a hop-up artist. I do try to prevent air leaks and other problems during assembly. For instance I tried several reeds for a proper seal while assembling the engine. On this one I settled on a stainless steel reed. I used a spare Tee Dee piston and cylinder but had to fix the ball joint slop. Then I break-in and test the engine for reliable performance. During the testing I swap Cox heads and Merlin heads to see if there is better performance from either.

Paint is Lustrekote of which I seem to have a lifetime supply.

Did anyone notice the "Nitrotane" decal? I used it in the late seventies. Has anyone else used it?

ray copeland · « **Reply #3 on:** December 10, 2011, 06:59:53 PM »

Larry, the plane and the set up looks awesome!! Nice job, those tee dee pistons and cylinders are getting a little scarce. The Merlin heads and plugs are great. I hope it flies well and often!!! I love the little Deweybirds.

john e. holliday · « **Reply #4 on:** December 11, 2011, 08:30:32 AM »

Vendors Corner, check out Coxinternational.

Andrew Tinsley · « **Reply #5 on:** December 12, 2011, 02:33:46 PM »

Doc,
Afraid not. The so called TDee pistons and liners are nothing more than twin slit exhaust cylinders, which have the divider milled out. The important extra honing at the bottom is not there.

Larry,
For someone who is not a hop up artist, you are not doing too badly!

Regards,

Andrew.

John Rist · « **Reply #6 on:** December 12, 2011, 05:41:59 PM »

Quote from: john e. holliday on December 11, 2011, 08:30:32 AM

Vendors Corner, check out Coxinternational.

It's weird - A TD .049 jug and pistion cost less than a TD glow head.

Larry Renger · « **Reply #7 on:** December 12, 2011, 09:19:09 PM »

There are two differences between these "TD" setups and a simple hogging out of a RTF slit cylinder. First, they have added the "swirl" boost ports as used on the Venom, Killer Bee and last of the TDs. Second, they have shortened the skirt and lightened the piston so it has the correct sub-piston induction.

I plan to order a couple and test them myself. Also note they have the Killer Bee/Venom crankshaft available. Do it yourself Venoms!

See the posting on the Hollow Log Drag Race to see what a Venom can do!

Joe Rice · « **Reply #8 on:** December 18, 2011, 08:59:12 AM »

Another very nice Dewey, Larry. I love the trick look of the engine. Dewyou

LL~have any any other 1/2 A projects on the boards?

Joe

Larry Lindburg · « **Reply #9 on:** December 18, 2011, 08:59:17 PM »

I dew have another Dewey in the works. It too was started three years ago. In the meantime I added heat shrink tubing to the filter on Dewey #3.

Author Topic: Another Dewey Cox (Read 1550 times)

Larry Lindburg

Another Dewey Cox

Tim Wescott

Re: Another Dewey Cox

Larry Lindburg

Re: Another Dewey Cox

ray copeland

Re: Another Dewey Cox

john e. holliday

Re: Another Dewey Cox

Andrew Tinsley

Re: Another Dewey Cox

John Rist

Re: Another Dewey Cox

Larry Renger

Re: Another Dewey Cox

Joe Rice

Re: Another Dewey Cox

Larry Lindburg

Re: Another Dewey Cox