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Dec 26, 2010, 10:41 PM
Flying...Pushing Air Down
sr71fan's Avatar
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Discussion

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

(2 min 44 sec)


Mini pi Yak (2 min 45 sec)
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Dec 27, 2010, 01:03 AM
Registered User
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.
Dec 27, 2010, 01:25 AM
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gjalbert's Avatar
That is one very nice flying little guy. Nice piloting, too, in such a small space.

Well done.

Gary
Dec 27, 2010, 11:12 AM
flyin' fool
goldguy's Avatar
Very nice. What's the power setup?
Dec 27, 2010, 11:26 AM
AKA Don
Very nice flying. Where is the cg?
Dec 27, 2010, 03:08 PM
Registered User
cg starts around 25%. Frank, his setup is listed at the end of the video.
Dec 28, 2010, 11:50 AM
flyin' fool
goldguy's Avatar
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.
Dec 28, 2010, 11:44 PM
Registered User
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?
Dec 29, 2010, 12:23 AM
flyin' fool
goldguy's Avatar
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.
Dec 29, 2010, 02:15 AM
Flying...Pushing Air Down
sr71fan's Avatar
Thread OP
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
Dec 29, 2010, 02:49 AM
flyin' fool
goldguy's Avatar
It not fair, you having all the fun. That's why I'm scratchin' right now.

Da plan boss, da plan...........
Dec 29, 2010, 03:58 AM
Flying...Pushing Air Down
sr71fan's Avatar
Thread OP
Too Cool!
Dec 29, 2010, 08:10 AM
gpw
gpw
“There’s no place like Foam”
gpw's Avatar
SR, now you're just showing off !!! hahahaha Cool videos !!
Latest blog entry: Lost plans
Dec 29, 2010, 08:47 AM
Registered User
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.
Dec 29, 2010, 11:12 AM
flyin' fool
goldguy's Avatar
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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