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Cox Engine of The Month
September-2020
sosam117's

"Traded an electric charger for this "Complete" (original) Cox Thimble Drome Olympic .15 engine. Right corner is photo as received."



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Post  batjac on Sun Sep 06, 2020 7:40 pm

I wanted a new plane for our club’s Labor Day fly-in, so I decided to slap this together in a couple of evenings.  Nothing fancy, just a quick build with a quick cover using some left over covering from my F4F build. I wanted to get some video of this flying, but I forgot to put the memory card in my Mobius camera.  I’m not much of a flyer, so I had the club hotshot put a flight on it.  He asked what I wanted him to do, so I said, “Do whatever you think it’s capable of.”  So he did pretty much everything in the Beginner’s pattern.  The plane flies wings level both upright and inverted with a nickel for tip weight.  Plenty of line tension in the overheads.  I didn’t have to add any nose or tail weight with the 8cc tanked Bee engine.  Flew great right off the board on 30 foot lines.  Doug over at Willie Nillies done good with this kit.  As you can see, I saved time by using a Brodak engine mount.  I like them for my 1/2A planes.


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The Slap Dash Mark
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Post  batjac on Sun Sep 06, 2020 7:55 pm

After flying the BRM, the club hotshot showed me his old Flip that had about a thousand flights on it.  He recommended I build one, so I slapped this together in a couple of evenings also.  It’s a Dick Sarpolus design.  A TD .051 on bladder will power this.  I’ll try 35’ lines, and have a set of 40’ on standby if the TD tries to screw me into the ground.

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Post  dckrsn on Sun Sep 06, 2020 9:28 pm

C'mon Mark, there's not a bit of slap on those girls. Beauties
both. Stunning! The Brodak reedy mount is a gem.
Bob
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Post  Ken Cook on Mon Sep 07, 2020 9:20 am

Brodak offers two versions of this mount. I have the numbers somewhere but one is a beige colored plastic and is fairly hard. The other is white a bit opaque but a lot softer. Both work well, I prefer the softer as it takes a shot a little better. Whenever I use them with a product backplate, the gear wire is bent in a inverted V. The problem is that the wire still moves behind the backplate. I drill another hole directly above the point of the V and use a additional screw with a washer that pinches the wire. It's just nice to have a mount that utilizes both engine types. Whenever I use them. I place a 1/4" piece of beam epoxied into the fuse. It prevents over tightening of the mount. Dick's designs are terrific. Blackhawk Models used a few of them. He's a interesting person to talk with.
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Post  batjac on Mon Sep 07, 2020 11:34 pm

Took the Flip out today and put three flights on it before it got too windy.  It was just windy enough.  The plane literally jumps out of my hand on launch.   Yes, I know.  The word “literally” is literally overused, but weighing only 6.45 ounces and running a TD.051 on bladder, swinging an APC 6x3, this literally jumps out of my hand.  It’s just a tad tail heavy, so I’ll either try a heavy Cox prop nut, or just put a nickel on the nose.  Probably go the nickel route since I don’t like the idea of loading up the crankshaft with needless weight.

Here’s a brief video of the Flip flying.  I keep forgetting to turn on the camera before I start the plane, so this picks up a little after half way through the flight.  You can see how easily it goes through the maneuvers.  Sorry about the camera angle, this is the first time I've tried to video someone else flying with my hatcam.





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Post  getback on Tue Sep 08, 2020 5:13 am

Hey Mark your planes look Great !! nothing wrong with quick and easy Very Happy Hat cam was a little trichy but that's ok the Flip was moving on good , did you flt it or did hotshot do all the honors ? That a kit plane too ? This Site Rocks!
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Post  Mike1484 on Tue Sep 08, 2020 10:28 am

Your planes fly as good as they look . Excellent work and flying !

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