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Old Dec 03, 2012, 01:59 PM
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Mini Vapor Mods

In order to achieve that best of flight experience and to have fun, I am trying various wing and propeller combinations. My goal is to achieve a more stable flight at slower speeds. A few things were discussed on the regular Min Vapor thread that I thought should be the start of a separate discussion.

One of my old threads on slow/stable flight can be found here ->
http://www.rcgroups.com/forums/showthread.php?t=865438

And here are some pictures of various test designs in progress.
Note- I make changes that can easily be undone

As I broke the prop shaft, I replaced with PKZ3328 (Vapor Prop Shaft w/Gear) and Cessna 210 prop -PkZ3002
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Old Dec 03, 2012, 08:20 PM
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So far, the Mini bi is the most fun to fly. The battery keeps the second wing in place if positioned as show in the picture. Now using a Cessna 210 (not Ember) prop which seems to have lots of power!
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Old Dec 03, 2012, 08:21 PM
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HAve you flown any of those yet? I'm interested in how the vaopr stab is working
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Old Dec 03, 2012, 09:02 PM
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Yes! I have flown all of the mods in the above pictures plus some others!

Here is a quick shot of the min bi in flight->

Mini Vapor Biplane mod (1 min 25 sec)
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Old Dec 04, 2012, 06:55 PM
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Looks good mate!

I've just ordered mine and haven't been able to get any Hyperion cells so will be trialing mine with some 130mAh NanoTech cells and a 40mAh NiMh pack, see here:

http://www.ebay.com.au/itm/271013748...84.m1497.l2649

Cheers - boingk
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Old Dec 04, 2012, 08:07 PM
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At least I have not killed anyone. So far I have only broken one prop shaft and a landing gear leg. Don't try this at home unless you are a professional!

Things that don't help the flight qualities of the Mini - will kind of fly ->
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Old Dec 07, 2012, 07:02 PM
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My latest test bed is one using an Ember horizontal stabilizer (PKZ3224) as in the pictures. I use dental floss to secure it to the frame and upper wing. The elevator portion makes an adjustable flap for that real slow flight. The battery wires hold the flap (elevator) in place.
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Old Dec 07, 2012, 11:47 PM
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Looks interesting, but weighty.

Personally I'd be experimenting with larger batteries (70~140mAh) and seeing how you can set up the trims and CG for sustained high-alpha.

Had a quick fly around the pub last night after close (I'm a night manager) and found it a hoot! Able to go really slow, as well as speed things up, and spot right down for landings on tables etc.

Cheers - boingk
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Old Dec 08, 2012, 08:52 AM
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Everything is a trade off when working with flight. The Ember horizontal adds about 1.05 grams to the weight. I believe that this is offset by an amount of extra lift and greater stability at high alpha. In fact, you don’t need to fly at as high of angle of attack to achieve the same slow forward speed. The mini bi stalls straight ahead instead of tip stalling or rolling making the recovery easier.

The Night Vapor prop doesn’t work well on the mini. The weight of it is around .9 grams compared to an Ember or Cessna 210 at .45 grams with the mini Vapor prop about .15 grams more. Plus, it sends some air that misses the smaller tail control surfaces on the mini which results in less control. The thrust is not as concentrated.

The weight of the Vapor horizontal is around .62 grams. It doesn't have flaps.
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Old Dec 08, 2012, 08:35 PM
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A video of one test flight ->

Mini Bi Vapor with flaps down (1 min 18 sec)
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Old Dec 10, 2012, 12:26 AM
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Used the Mini today with a NanoTech 25C 1s 130mAh battery.

Flew fine, fair bit of extra punch as well. Huge flight times of 20+ minutes.

Cheers - boingk
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Old Apr 17, 2013, 07:06 PM
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Flew the MV outside with the 150maH battery for the champ, it flew for 1/2 hour! Handled the wind very well with that extra bit of weight.
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Old Jun 19, 2015, 11:02 PM
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I am running 130's in mine (I just got it 2nd hand with some 130's)
It needs 3/4 trottle to stay level, do I move the bigger battery back a bit?
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