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Old May 14, 2001, 08:43 PM
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hardlock's Avatar
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CAM 6x3 folder - best mtr/pack?

I'm building a flying wing that I want to use this prop on. I love the performance of the CAM 8x4.5 folder on my MM direct with 7-8 cells at 40-45ozs.

Since the motor will be a pusher for this flying wing design, I wanted a folder for it to be used for soaring. Not too many choices it seems, so figured I'd just get the prop and work backward.

What motor w/ #cell pack would be best? Seems the more I read that a S400 is too weak and a 480 is better. 450 getting too heavy?
Want to keep the weight at around 20 ozs RTF. (no, it's not another Zagi clone!)

Thanks
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Old May 14, 2001, 09:04 PM
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Jim McPherson's Avatar
Laurel, Maryland USA
Joined Aug 2000
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Motocalc says the Astro 010 works well with the 6x3 folder, however you'd need to stay around 7 cells as amperage gets to be about 5 amps with 8 cells. Using the astro would signifigantly lessen your overall weight.

-Jim
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Old May 14, 2001, 09:19 PM
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Wanted to stay cheap if possible.

Isn't an 020 the replacment for an S400 or would the 020 be closer in performance to an 05 can?

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Old May 15, 2001, 06:32 AM
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United States, GA, Powder Springs
Joined Dec 1999
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FWIW - I've used a Robbe 6 x 3.5 folding prop with the JK Aerotech T-52 & it worked better than any other Speed 400 direct drive prop configuration.

This power/plane configuration is similar to using a Pinto engine in a Corvette. It works, but the performance isn't . . . breathtaking.

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Old May 15, 2001, 07:13 AM
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United Kingdom, Bracknell
Joined Nov 2000
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My standard Pico Jet flys fine at about 20 oz with a 6v S400 and 7x900 Nicd cells. Your pusher flying wing must be pretty similar so should be OK on the same setup.

The CAM 6x3 folder is fine on these motors, I had them on my Twin Star for a while (using 8x2400 cells) and duration was outstanding.
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Old May 15, 2001, 11:44 AM
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Austin, Texas USA
Joined Mar 2001
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My Graupner Terry uses a CAM 6X3 with a speed 400 motor and an RTF of 19 ounces. This is stock from the factory, and flies quite well on 6-7 cells. The Terry is very efficient, though, so on 8 cells you may get a little more oomph for a wing.

If you go with a 480, I would prop a little more, and try the 6X4 from Dymond. Everyone seems to have very good performance with this combo.
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Old May 15, 2001, 10:57 PM
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Running the 6x3 through Motocalc with a S400 shows fair results at least on the lower end of the airspeed range.

What's really strange is when running the stock Zagi and/or FMA Razor props (MA 5.5x4 and 4.5 I think) in the program. It shows them stalled up to near flight speed. Climb is better however.

From what I'm reading around here, the 6x3 is a little low pitched? I'd think that unless you have a real fast plane, a slower park flyer would benefit from the torque at lower speeds. Am I right here?
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Old May 16, 2001, 03:54 AM
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United Kingdom, Bracknell
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Yes, the CAM 6x3 (and smaller CAM 4.7x2.3) folders are really intended for slowish flying e-gliders using direct drive S400 (S280 for the smaller prop), and are fairly low-pitched.

On the Twin Star (8 cells), at full throttle they didn't give enough forward speed for comfort when flying in windy conditions. But they were almost fully unloaded in level flight so current draw was low and duration excellent. And with the spinners they looked great!
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