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Post by Electric Steve on Dec 2, 2023 16:34:03 GMT -6
Hello from Stevephoon from the old WattFlyer site. Back on the old site user SlowJohn had a thread about a twin-engine plane he designed. I was quite taken by his design and chatted with him online about it numerous times. He sent me his full-sized plans of it as part of a separate kit swap we did. This was about ten years ago. I never did anything about it until now. I have started on my own twin design inspired by his. Here is a picture of SlowJohn's SleekTwin:  I am keeping his basic fuselage and tail shape but I am redoing the wing and nacelles. Here's what I am thinking of:  58 inch wing span and 55 inches in length. Using a single 4S 4000 mAh lipo battery in the fuselage. As you can see from the attached pictures, I have completed the first cut of the design and plans. I need to double check everything and then I'll proceed with cutting out the parts... I am not planning on doing a complete build thread, but I'll post updates every so often. |
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Post by Electric Steve on Dec 2, 2023 16:50:22 GMT -6
For a little background... I am not an accomplished CAD or airplane designer. I use WingHelper , devFus and devCad-CAM Pro for my CAD programs. WingHelper and devFus do most of the work and then I tweak what's left to do in devCad. This includes laying parts out to be cut on my Shapeoko 3 CNC machine. My CNC machine is already out of production, but the next couple of generations of machines are available from Carbide3D. For an example, my last two builds were a redo of the Jetco AT-6 Texan and an electric Mach One. Mach One Photos on FLICKR AT-6 Texan Photos on FLICKRI am beginning to get the hang of designing RC planes with these tools and hopefully I can pull off this design in SlowJohn's memory as well. |
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Post by Don Sims on Dec 3, 2023 4:34:11 GMT -6
Looks like a great design Steve! Hope it flies as good as it looks!
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Post by Electric Steve on Feb 17, 2024 15:27:13 GMT -6
The balsa and ply construction is mostly complete. It has a 58-inch wingspan, a 50-inch fuselage length, and twin Tempest 2217-1120 electric motors for power. I used an Eppler E168 symmetrical airfoil for the wing and a NACA 0010 for the horizontal stabilizer. The weight of all of the wood parts is 34.1 oz and the weight of everything else except covering is 35.1 oz. This is about 4.5 pounds and includes a 4000 mAh 4S battery. Flying weight will probably be about 5 lbs. The motors together will produce 750 watts and 98 oz of static thrust using 8x6 props. 150 watts per lb, so it should perform pretty well. Lots of filling, sanding, and fitting in my future. Still need to dream up a covering scheme as well... So, 70% done and 70% to go.... Steve ![]()  |
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wildflyer
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Posts: 57 
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Post by wildflyer on Feb 22, 2024 14:13:28 GMT -6
Back in my control-line days, I found that 2 motors seemed to give 4 times the thrust as 1.
I put 2 Cox .049 baby bees on a little flying wing I designed, it was so fast it was hard to flying our back yard.
Your plane looks great. Reminds me of a Dualist and my Deuces Wild.
Hope it doesn't tip on landings
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Post by Electric Steve on Mar 20, 2024 14:07:51 GMT -6
 The Sleek Twin is ready for a maiden, unfortunately, the weather is not. It's 31 degrees with 20 MPH winds right now.  Final weight with the battery came out as 4 lbs 13 oz. It should be fine. The battery needs to be all the way out front to balance, but at least I don't need to add any weight. Looking forward to getting it in the air! |
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Post by Don Sims on Mar 22, 2024 20:02:47 GMT -6
Hoping it flies as good as it looks.Looks super!
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Final weight with the battery came out as 4 lbs 13 oz. It should be fine. The battery needs to be all the way out front to balance, but at least I don't need to add any weight. Looking forward to getting it in the air! 
