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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  Ricksrod on Mon Nov 04, 2019 8:24 pm

I'm working on my first RC plane. Its a Kinner Sportster 39" WS Kit by Flyline. It's an older kit and none of the parts are Lazer cut just printed. Very detailed kit and a lot more work then I thought it would be. I'm using an Electric Rimfire 400 for power. I think it should be OK. It should weight in around 20oz when complete. I have a Hobbyzone Champ that I am learning to fly with before I take the Kinner up. I have built some control line which I enjoy but this RC plane is much more complex.Kinner Sportster Kinner13
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Post  Kim on Tue Nov 05, 2019 7:08 am

WHOA....AND....WOW!!!!!!!!!!!!

Beautiful work!!!!!!!!!!!!
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Post  getback on Tue Nov 05, 2019 7:20 am

Very nice !! And yes alot of work/fun for a print out and stick and tissue model . Keep us informed on the progress , what are you covering it with ? Very Happy
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Post  Ricksrod on Tue Nov 05, 2019 9:04 am

I'm thinking of ultracote for covering. Weight is 16oz w/o covering. A little heavy but should be ok. It's a fun build but I'm itching to get it in the air. Some guys have spent months on this kit. Their attention to detail is unreal. Wish I had their patience!
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Post  66 Malibu on Tue Nov 05, 2019 10:06 am

I also have a Flyline Kinner Sportster kit and I always thought that silkspan would keep the authenticity of the era.
Especially true with a Speed 400 that has no hot fuel issues to deal with.
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Post  Ricksrod on Tue Nov 05, 2019 11:15 am

66 Malibu wrote:I also have a Flyline Kinner Sportster kit and I always thought that silkspan would keep the authenticity of the era.
Especially true with a Speed 400 that has no hot fuel issues to deal with.

Nice to hear of another Kinner. Is yours flying? Did you go nitro or electric? Any pics available?
Mine seems a little heavy, I'm hoping for the best.
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Post  66 Malibu on Tue Nov 05, 2019 4:36 pm

No,  
I have not started to build the Kinner yet mainly due to lack of time and other things in progress. The print balsa sheets will require much more time and work than I can devote to it right now to meet the end result of a really nice build.
Of the Flyline series of kits, the Kinner and the Bucker Jungmann ( which I also have) are the most desirable for me.
I have a friend here in Atlanta who has one of all the kits but I looked long and hard for my two kits with the Bucker being the Holy Grail for me.
Looking forward to following your build in progress.
Steve...
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Post  NEW222 on Tue Nov 05, 2019 5:17 pm

If you are going the plastic covering route, I would think that with a build as nice and clean as yours, a transparent covering would both look nice, and you can show off your great building skills!
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Post  Ricksrod on Wed Nov 06, 2019 9:38 am

Here is a couple more shots as the build progressed. I started on Oct 19th. Right now I'm thinking of going with a "Pull Pull" rudder. I have never done one before. I wonder if they sell a small 1/2A kit for that?

Kinner Sportster Kinner16
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Post  NEW222 on Wed Nov 06, 2019 11:18 am

I may be wrong here as I have never done a pull-pull setup before, but could you use two small control horns opposite each other and then use just thread/spectra fishing lines for the 'cables'?
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Post  Ricksrod on Wed Nov 06, 2019 11:52 am

NEW222 wrote:I may be wrong here as I have never done a pull-pull setup before, but could you use two small control horns opposite each other and then use just thread/spectra fishing lines for the 'cables'?

That's what I was thinking. I just need to figure out some kind of eyelets to attach to the rudder for the lines.
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Post  NEW222 on Wed Nov 06, 2019 4:25 pm

Call it redneck, but I may be able to suggest something. In my foamies, I just use a piece of 'zip tie/ ty'strap' with a hole in teh end glued in place, and none have ever given me problems, with the exception of my own doing..... Anyways, with a model as yours, you should be able to safely use that technique. Make it as long as you want, round the edges and drill two 1/16" holes (one on each end). With balsa, I would quickly rough it up and insert it through a slit in the rudder itself as one piece, and glue in place. Then you would have one 'ridgid' control horn. Run your strings as required and see how it goes. Again, I use them on foamies, so if you were to try it, I would try it out on a scrap piece of balsa and see how it holds or such. Just a thought on what I would be trying.
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Post  Ricksrod on Wed Nov 06, 2019 6:41 pm

NEW222 wrote:Call it redneck, but I may be able to suggest something. In my foamies, I just use a piece of 'zip tie/ ty'strap' with a hole in teh end glued in place, and none have ever given me problems, with the exception of my own doing..... Anyways, with a model as yours, you should be able to safely use that technique. Make it as long as you want, round the edges and drill two 1/16" holes (one on each end). With balsa, I would quickly rough it up and insert it through a slit in the rudder itself as one piece, and glue in place. Then you would have one 'ridgid' control horn. Run your strings as required and see how it goes. Again, I use them on foamies, so if you were to try it, I would try it out on a scrap piece of balsa and see how it holds or such. Just a thought on what I would be trying.

I like the zip tie control horn. Most of the horns you buy are the same material. I included a couple pics of my CA hinges and tooth pic pins.Kinner Sportster Zip_pu10
Kinner Sportster Hinge110
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Post  NEW222 on Wed Nov 06, 2019 9:42 pm

I really like the toothpick idea for a bit of extra added security. Something to remember for the next time I use them. Glad you like the zip-tie idea. It does look good in the test piece.
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Post  Ricksrod on Sun Nov 17, 2019 4:24 pm

Took the Kinner out today. A little shakey on takeoff and ended in the grass with a broken landing gear. I need to re-think the gear layout. Something a little more forgiving.Kinner Sportster Kinner17Kinner Sportster Kinner19
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Post  getback on Sun Nov 17, 2019 4:59 pm

The Plane Looks really Good !! I like the looks of the hinge pins you put in Nice job <><> Those are diamonds LOL ,,, I don't see in the build how you did the landing gear seems it just tore out with a sideways landing. May want to make it more rigid instead of springie , That way it could bounce if needed . Huh...
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Post  Ricksrod on Wed Nov 20, 2019 2:44 pm

Repaired the landing gear. Used wire this time. Now just need some good weather to give it another try.

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Post  NEW222 on Wed Nov 20, 2019 4:31 pm

Great job on the plane. It looks really nice.
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Post  getback on Wed Nov 20, 2019 4:37 pm

Popcorn RC Plane
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Post  Ricksrod on Thu Nov 21, 2019 8:20 pm

The Kinner got a pilot today. I'm counting on his help on my next flight!

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Post  Ricksrod on Wed Sep 02, 2020 10:04 pm

Well I flew the Kinner the other day. First flight did not go too well. She needed more dihedral. I did some work on her and the video below is the results. she did fly ok but my repair was not up to par and I lost a wing. She may now be a wall hanger but you never know!

https://youtu.be/1_6hVUJXuLw
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Post  Cribbs74 on Wed Sep 02, 2020 10:19 pm

Rick,

I see the problem right off, there is no Cox engine in it! Very Happy

In all seriousness though, what is the wing loading? AUW with the electric vs the glow?

It did seem to roll out ok though. I say fix it and try again, sorry it broke, but hey it flew!

Ron



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Post  MauricioB on Wed Sep 02, 2020 11:12 pm

Hi, I'm sorry about the accident.
Do you have photos of the wing? Just the center, I would like to see the structure. Maybe I can give an opinion by seeing it.
Thank you.
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Post  balogh on Thu Sep 03, 2020 2:02 am

Sorry about the crash of your beautiful plane. I always replace the wooden spars and leading edges with carbon rods or hollow sections sold by hobby shops, that will never leave you with wings broken or collapsing in harsh landings or aggressive loops or similar when wooden parts yield much sooner.

I do not often fly electric planes, I only have one foamy that also has an embedded carbon spar as stock design, but the vibrations generated by internal combustion engines really call for such carbon reinforcements.

Just my 2 cents.
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Post  getback on Thu Sep 03, 2020 7:37 am

DAMMIT! Man , Hate to see that , but it happens . Appears it was a little trichy at the controls , as in a no glide forum of flight , as you said i would re-ck. the dihedral and put her back together for another run . RC Plane
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