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Old Oct 12, 2002, 09:36 PM
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eBird's Avatar
Grand Junction, Colorado
Joined Jul 2002
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Super Slow Stick - geared 400

Turbocharged the SS this weekend.
Mounted a 6V speed 400, with a CEM 400GR ball bearing gearbox. Ratio is 3.01:1.

I moved the batts back about an inch, and got the CG spot on, she flew stable and nice, but no where near the thrust I would have expected.


What prop do you guys think I should use with this setup? Took her out today with the 11x8, but performance was not stellar. In fact, darn nearly the same as the 370 motor.

Any ideas? Obviously, that prop is too much for that gear ratio, and I need more RPMs...
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Old Oct 12, 2002, 10:44 PM
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eBird's Avatar
Grand Junction, Colorado
Joined Jul 2002
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Here's a shot of the GB

How to prop this baby?
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Old Oct 13, 2002, 12:33 AM
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Oxford, MS
Joined Apr 2002
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Hmm well you could try a APC 8x6E. That what I fly on my GWS Zero but it's geared 2:1.
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Old Oct 13, 2002, 01:23 AM
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Grand Junction, Colorado
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Well, this GB comes with three interchangeable gears, 2:1, 2.5:1, and 3:1. I figured I'd use the 3:1 to go for the biggest prop.

I'll buy a few and just experiment. Maybe an APC 8X6 will do the trick....
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Old Oct 13, 2002, 01:58 AM
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San Antonio
Joined Dec 2001
410 Posts
Too much prop load. I bet the motor gets kida hot. I have a sp400 on my Soarstar, with a 3.3 gb., and an 8*6 prop. It moves fast. I tried a 9*6, and it wouldn't unload until I dived it, then it slowly bogged down again. I'd siggest using the 8*6, and going from there. But thedraggy design of the stick isn't gonna do much for you. Speed it up too much, and you'll watch the wings fold.
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Old Oct 13, 2002, 08:43 AM
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Toledo Ohio, USA!
Joined Dec 2001
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i have the same G B on my fundango. a 9 by 7 gas prop works wonders! use the 2nd smallest gear! hope it helps
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Old Oct 13, 2002, 10:18 AM
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Walled Lake, MI, USA
Joined Feb 2000
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Assuming that the _Slow_ Stick is meant to be flown slowly, I'd go with a large diameter, low pitch prop for maximum thrust. The GWS 10x4.7 or 11x4.7 might be a good place to start.
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Old Oct 13, 2002, 12:14 PM
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eBird's Avatar
Grand Junction, Colorado
Joined Jul 2002
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Yeah, all I'm after is slow flight, but with more thrust.
I live at about 5000 feet, and with the stock setup and 11x8 or 10x6 prop, I get up to about 150 feet and the SS just doesn't want to climb any more. Takes forever to get there with the camera.

I figured the 400 would get me to altitude with more authority.

Shoot, I was hoping the thing would nearly prop hang!

I'll try an 8x6, and a large diameter with low pitch if I can find one at the LHS.

Thanks for the suggestions!
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Old Oct 13, 2002, 01:16 PM
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NJ
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ebird, I want to do the same...what ESC and batteries are you using?
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Old Oct 13, 2002, 02:09 PM
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Grand Junction, Colorado
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Quote:
Originally posted by max throttle
ebird, I want to do the same...what ESC and batteries are you using?

15amp ESC with 7x600AE and 8x800 NiMH

I just bought some props.
An APC 11x4.7, 9x4.7, 9x6, and 8x6.

I'm hoping the 11x4.7 will do the trick. The gearbox is great, runs real smooth. I just hope the 3:1 ratio is enough, I may have to find a higher ratio box. I want THRUST, not SPEED.

I'll report back when I try out the props.
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Old Oct 13, 2002, 04:46 PM
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Grand Junction, Colorado
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Not too impressed so far

Well, the 3:1 ratio with the 9x4.7 is not a good combo. Nor is the 8x6, the plane is just too draggy. Poor climb, poor speed.

The 11x4.7 performed the best, about as well as the stock motor with the stock prop.

I've been using a 7.4V speed 400, perhaps before I give up I'll try a 6V S400.

Failing any major performance improvements with that, it's obvious I'll need a bigger ratio GB.

Next test flight: 6V S400 with 9x4.7 and 11x4.7 props.
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Old Oct 13, 2002, 06:22 PM
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NJ
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I am currently flying the SS with a BB 280 motor with a 5:1 BB GB and a 12x6 GWS prop. The SS really hauls with this setup ONLY if I use at least 7 cells (usually use 8x800 NiMh and 8x1700 NiCd). I tried the 10x4.7 and it works but the performance is not even close to the 12x6. With that said, I am just guesstimating here, I thought a 400 size motor would provide more torque and being geared at 5:1 would be able to turn a 13" or larger prop (keeping the same pitch at 6, I like that speed) would equate to being able to haul more weight .

Am I wrong?

Also, I am thinking of going to 9 cells for the 400 motor, do you think I will burn the motor out?

Don't give up!

Max
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Old Oct 13, 2002, 06:49 PM
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Grand Junction, Colorado
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OK, the 6V S400 performs noticeably better, no question.

Unfortunately, the pinion gear fell off the motor during climbout, so I landed and had to switch to the 2.0:1 gear.

With the 6V S400, 7x600AE pack, and the 11x4.7 prop, the performance was slightly better than the stock SS setup. Run time was shorter, and power off glide is a little faster so not as much nice "floating" like you get using the lighter 370 motor.

I can live with the faster glide speed but the performance gain isn't enough to make it worth it.

As to your question, if you're going to use 9 cells, you should probably get a 7.2V S400, I think it may heat up the 6V version too much. An 8x600AE pack really cranks a 6V S400. My 7x600AE's put out quite a bit of power, a tad more than my 8x800 NiMH with this motor.

I need a different gearbox, though. A 5:1 ratio would be great, will yours adapt to a S400?? If so, I want one!

I've done some looking on Hobby Lobby and elsewhere and there aren't a lot of GB's over 3.x:1.
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Old Oct 13, 2002, 09:34 PM
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Walled Lake, MI, USA
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If you had mentioned in the first message that you are flying at 5,000 feet, you might have gotten slightly different answers -- and saved a little money on all of the bits and pieces you have been buying. There have been many messages posted on compensating for altitude.

The simplest thing to do in thinner air is to just install a larger prop on the stock motor setup. GWS recommends 3 different props for the Slow Stick motor (EPS-300C-DS): 11x4.7, 11x8 and 12x6. Since you are more interested in thrust than speed, you should stick with a prop where the pitch is half or less of the diameter. I'd suggest putting the original motor back on your Slow Stick and trying the 12x6 and 13x6.5 GWS props. Those should give you the roughly the same performance at altitude that others are getting at sea level with the 11x4.7. Save your 400 motor and gearbox for a future project.
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Old Oct 13, 2002, 10:29 PM
Look! Up in the sky!
eBird's Avatar
Grand Junction, Colorado
Joined Jul 2002
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Quote:
Originally posted by Dave Hederich
The simplest thing to do in thinner air is to just install a larger prop on the stock motor setup. Since you are more interested in thrust than speed, you should stick with a prop where the pitch is half or less of the diameter. I'd suggest putting the original motor back on your Slow Stick and trying the 12x6 and 13x6.5 GWS props. Those should give you the roughly the same performance at altitude that others are getting at sea level with the 11x4.7. Save your 400 motor and gearbox for a future project.
I don't think others (at sea level) are using the 11x4.7, all I've seen posting here are using the 11x8 or 12x6.

I've used the12x6 with stock 370 motor and "D" gearbox, and it doesn't perform much (if any) better than the 11x8, although the specs say it should.

I'll try the 13x6.5, but I think the 11x4.7 with the 370 motor won't perform as well as the 11x8.

The S400 has got to outperform the 370 if I can just find a suitable gearbox.

I'll see if the LHS has the 13x6.5 and give that a try before getting a GB, though. Can't hurt.

Thanks for the suggestions...

(specs attached)
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