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Old Dec 26, 2010, 09:41 PM
Flying...Pushing Air Down
sr71fan's Avatar
Clovis, NM, USA
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Mini piYak

I thought I'd try a smaller version of the great-flying piYak, and I'm mighty glad I did. Check out this video.

Gary

Mini piYak (2 min 44 sec)


Mini pi Yak (2 min 45 sec)
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Old Dec 27, 2010, 12:03 AM
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Nice. Been thinking about that myself... I have some 3mm epp, just no light servos,esc or motor at the moment and others in the way first.
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Old Dec 27, 2010, 12:25 AM
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That is one very nice flying little guy. Nice piloting, too, in such a small space.

Well done.

Gary
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Old Dec 27, 2010, 10:12 AM
flyin' fool
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Very nice. What's the power setup?
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Old Dec 27, 2010, 10:26 AM
AKA Don
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Very nice flying. Where is the cg?
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Old Dec 27, 2010, 02:08 PM
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cg starts around 25%. Frank, his setup is listed at the end of the video.
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Old Dec 28, 2010, 10:50 AM
flyin' fool
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I must be getting old, watch the vids and still had to ask.

Checked out what small stuff I've got, did some math, sub 4 oz. should suffice and I'm truning out a 16" span Pi R1. My doodles look about right as it's already a fattie.
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Old Dec 28, 2010, 10:44 PM
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I found a new way (at least to me way) to figure wingloading for little buggers.

Weight in oz / 16 * 2304 / wing area = oz/sq ft.

I am looking at going for an 18" pi at 5.25 oz 150g or less for a wingloading of under 3oz/sq ft. 22g for three servos, 28g for esc and rx, 32g for battery, 22g for motor and mount, leaves about 43g for airframe which isn't much wiggle room at all....

Just thinking outloud I guess at where to cut weight other than using a 10g motor, 2.5g servos and smaller battery if I get little stuff for your small kind. What kind of 2g receiver do you have and where did you get your 240 2s?
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Old Dec 28, 2010, 11:23 PM
flyin' fool
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I don't think the 10g motor or those 2.5g servos are up to the task with an 18 incher. Seen them both at our indoor on too big of an airframe. It's not just about the weight, but the drag as well.

I got my 240's from www.allerc.com. Great little batteries, the original and best 'nano tech' lipos. Can be safely charged in 12 minutes, similar performance to my 360 Rhinos. I bought the single cells and made my own 2S packs so I could add the balance connectors, pix next to a 3.7g servo.
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Old Dec 29, 2010, 01:15 AM
Flying...Pushing Air Down
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I also built my 2S packs from single cells. Got mine from HK. Did not put balance taps on to save a bit more weight. My 2g receiver is the Spektrum AR6300. The wing loading on this little guy is 2.53 oz/sq ft. It's so much fun!

Gary
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Old Dec 29, 2010, 01:49 AM
flyin' fool
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It not fair, you having all the fun. That's why I'm scratchin' right now.

Da plan boss, da plan...........
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Old Dec 29, 2010, 02:58 AM
Flying...Pushing Air Down
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Too Cool!
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Old Dec 29, 2010, 07:10 AM
gpw
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SR, now you're just showing off !!! hahahaha Cool videos !!
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Old Dec 29, 2010, 07:47 AM
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Frank, you stole my thunder. After seeing your gee bee pbf, that is exactly what I was going to do since indoor season finished last year before I got mine done. The18" is because I don't have a10g. Mine is a17g and 5g servos etc and I want a lower wing loading than my16" with similar gear.
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Old Dec 29, 2010, 10:12 AM
flyin' fool
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TW:

Oh, I get it now , you were just thinking outloud.

Before I started the operation with my trusty blade, I realized my doodle doesn't show the fuse as being pudgy enough, not 'toon' enough. Went fatter and decided to hang the rudder off the back end and no LG, much simpler.
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