This is my latest scratch build. It was inspired by the Top Cap. AUW is 3 1/8oz, WS and length are both around 20". I maidened it in 17mph winds, so I don't know if it hovers well, but it should be able to since it has 8oz of thrust at WOT. Hover tests in the living room resulted in a slight pull to the belly, and I had to grab it before I could get my hand to the TX. I think I need to adjust the vertical CG. I'll try again in the living room once I get it tweeked.

Looks GREAT MIKE! Why didn't you maiden it in the living room? Can you balance a model through the prop nut to acheive a low maintenance hover? I've never tried that and maybe that's why my planes are alot of work to hover.

what prop you running Mike?

Too much work to dork it into the couch on the first flight. I'm gonna get a feel for it in a bigger space before I try the living room again. I usually don't balance mine vertically, but this one looks like it might need it.

The prop in the pic is a 5x3, but the 6x3s I ordered came shortly after those pics were taken, and the second flight was done on that prop. I would love to try a 7x1 or 7x2, but I don't think that prop exists.

I've seen that motor before. What are the specs.? Where do you get it, and did it seem to have a lot of power in hover? and was that 3.1/8oz ready to fly? Looks really good!!

Its a cdrom motor I made. It weighs about 1/2oz, puts out 8oz of thrust, and draw about 5.5amps. It will hover at 1/2 throttle. Yup that weight is rtf.

I think I need one of those!

color and LG

The winds were too high, and the temptation was too great. It has hovered, TRed and violated rule 9 in my living room.

Did you take any pics.? Where could one find out more about that motor of yours?

no pics. My camera doesn't like indoors. The only way I can get a pic indoors is if I hold it directly under a light bulb. There's a lot of info about cdrom conversions over at ezone. Do a search in "power systems" and "indoor and micro flight". I will be working on putting the specifics of the one on the micro Cap motor on my website. There's a club meeting at the local field today, and if my friend brings his camera, then maybe we can get some video of it flying in the club shed.

What battery type & voltage you using. I just converted a motor today. Took about an hour.

I'm using a 2 cell (8.4v) kokam 340. I would also like to try an Irate 500 pack. They're only a gram heavier per cell and should put out similar amps. I got a video of it flying in a shed last Saturday, but I wont be able to post it till friday evening. I got my printer hooked up, so now I can print out tapered balsa ribs. My next project will be to get under 3oz and have atleast a square foot of wing area. I think the balsa one will be based on an Edge. I found out my motor only puts out about 6.5oz of thrust at about 4 amps with the 340s. I think its because the voltage drops lower than it did when I tested it with the etec 1200s. It still feels like its got lots of power in the air.

I ran mine on e-tec 1200 3cell for a couple seconds. runs good but Voltage too high. I need to get a different battery and a plane for it now..

I have a 340 3 cell that I've been real tempted to try. It would fix the tailheavy problem, but I'm not sure I want to fix that.

I finally got the video from my friend. The last two are of my cap http://www.rcsites.net/fwilly/video.html

Mike, Awesome flying! That plane is bad *****

thanks. The planes getting pretty beat up and I'm gonna make a balsa version that should be even more bad *****

Are you not having any problems w/wires on the motor breaking. That seems to be my biggest problem w/this motor???

There were some holes in my stator between the bearing and poles. I fed some thin tubing through 3 of them and then fed the magnet wire through the tubing. I left just enough wire sticking out to solder the controller wires onto and then put heat shrink over the joint. I know most motors don't have these handly little holes, but they help with the wire breaking. I'm working on a bigger one for a Shock Flyer that I will have to think of another solution for. I'll let you know what I come up with.

Hi Mike,

I'm working on my first direct drive CD-ROM. I have built a couple of geared units on which I run 10x4.7 prop getting around 12 oz static thrust from 5 Amp (3s1p 700 LiPo). But I didn't do direct drive yet. I want to save a weight on my 16inch wingspan Ultimate Biplane so direct drive is the option here. What I need is around 6oz thrust from less than 5A from 2s1p 340 LiPo. Exactly what you have.

So here are the questions:
1. What winding did you use (how many turns, what wire)?
2. Is it delta or star connection
3. You did use 6x3 prop, right? Did you try 7x3 ?

RysiuM

1. 14 turns of 26awg
2. star. I also tried 30 turns of 30awg in delta configuration and got similar results
3. 6.5oz@4amps was done with a 6x3, but I've been flying with a 7x3.5 lately.

Unless you've got REALLY good stock magnets, I would recomend replacing them with 12 5x5x1mm n45 magnets, or your results will be a lot different. Another thing to consider is stator size (seems to be what everyone goes by when comparing motors). Mine is 20mm. I'm working on another one with a 23.5mm stator like the Chipsledde motor.

Thanks. I have just finished the winding. I used exactly the same data: 30 turns of 30awg wire in delta configuration. N45 magnets (5mm x 5mm x 1mm). I have put GWS 7x3.5 direct.
It's to late now, so I will try to run it tomorrow.
Oh, BTW the weight of entire system (including mount and prop) is 26g

RysiuM

That should fly an 18" ultimate really well. I've got a 23" ultimate that I want to try mine on. Should weigh around 4oz and its got 200 sq in of wing area.

Mike, I run the motor!!!

The results are excelent.

using 7x35 powered by 3s1p 700 LiPo at 1/2 throttle motor spat the rotor at 8600 rpm. As a matter of fact, the static thrust pulled out the rotor (I don't have any lock on the shaft). Yesterday I check the force needed to pull out the rotor from the stator (on the digital scale) and it was 8.5 oz. I run my rpm through my static thrust calculator, and the result was: 8.5 oz.

Next test was using the same prop with 2s1p 340 LiPo. This time rotor stayed in place spinning the prop 7860 rpm at WOT. The calculated static thrust is 7.52 oz.

That's what I want. I need to measure the current to calculate the efficiency, but my guess is somewhere between 4 and 5 A. When I find the right connectors, I will measure it.

Anyway, my little bipe has a powerplant.

RysiuM