2.6" downscale of Mach2 rocket glider for 18mm D-2.3 motors

I made this this morning, based on a 12" long piece of bt-80 tubing, and some depron tail/wings downscaled from my Mach2 kit, I'll call it a Mach1, for 18mm D-2.3 rc motors, these are really neat little motors. I used two 8 gram servos, and a 5 gram receiver and 15 gram battery, needed no extra nose weight. AUW is 141 grams rtf and a half an ounce less in glide, a little less than 1 sq foot wing area. Wind this morning was pretty gusty, 8-10 mph, boosted really quickly and handled the wind well, landings were sort of elevator like, ie just set up into the wind, keep a little nose down and it just drops at a moderate rate straight down onto the runway. Very cute. I'll try to get some video later in the week if the wind slows down. Instead of a keel/underside mounted servos on the larger 4" kit, I did the servos on top, recessed into the fuse and no keel to save weight and give less to catch on when landing. Just like it's bigger brother it needed down trim for boost, I had to tone down the aileron movement as it was pretty responsive. I mounted the rail buttons on the side of the fuse where they would clear the servos/tail and not be on the bottom to catch on when landing.


2.6" diameter, 12" length, about 22" wingspan.

Frank

Here is the video from today, still a good 8-10mph headwind, it handles it well, but you can see it doesn't have much mass to penetrate the wind, just a sort of vertical elevator type decent, very controlable..

[video=youtube;nLiz-IlN-q4]https://www.youtube.com/watch?v=nLiz-IlN-q4&feature=youtu.be[/video]

I'm revisiting this again, basically a 2.6 inch diameter version of the old centuri mach 10 but modified for RC and no ejectable nose weight. This required that the wing be moved forward so that the CG would be far enough forward naturally to have yaw stability with the short coupled vertical stab. I also made the little horizontal stab parallel with the wing because you don't need the drag of the original placement on the leading edge of the vertical stab to provide angle of attack for glide you can do that with the elevons. Now that I'm carrying the d2.3 reloads and cases, I might kit this.....Modifying the tube length to 13.5", looking like it will still be at 5 oz rtf. and putting the motor thrust line down the center will remove the down trim that was required for boost on the original version.

Here's the prototype airframe completed at 68.7 g right now, 22 g for servos and push rods 29 g for the loaded motor 15 g for the battery and 9.6 g for the receiver and battery wire I can maybe dump a few grams if I get rid of the case for the receiver should be close to 141 142 g right around 5 oz. Glide tests look good at the original CG location I had.

Hey Frank are going to to kit the 18mm version of the Mach 2? If you are l would be interested in getting one

Thats the plan, I'll finish and fly it when I get back tues/wed.

Brian V said:

Hey Frank are going to to kit the 18mm version of the Mach 2? If you are l would be interested in getting one

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Cool Thanks!!! Have a Safe trip!!!

Maiden was great, I removed the casing on the AR-410 reciever to save 4 grams and it balanced perfectly with no weight added, 4.98 oz ready to fly, boosts nice and straight.

I'm going to call it the Mock 10

Cool little RG let me know when the kit comes out I want one

It's up on the website now.

Brian V said:

Cool little RG let me know when the kit comes out I want one

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