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Old Jul 02, 2012, 04:39 PM
Grand-Duchy of Luxembourg
Aender69's Avatar
Joined Sep 2005
258 Posts
Quote:
Originally Posted by kmdunnster View Post
Did a little math and mine comes in with a wing loading of 13.45oz/sq'. Respectable for a slope, but not a floater. On the slope, I flew it like a molded sloper, keeping the speed through the turns. It doesn't like to go slow.
Kev
Yes it does.
Back from my evening soaring. 15 % flaperons, -10 % elevator on the Aurora, and she soars like a kitten... CoG on or a bit behind 80 mm.
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Old Jul 02, 2012, 04:48 PM
Cross your Fingers
kmdunnster's Avatar
Long Beach, CA
Joined Mar 2010
999 Posts
Quote:
Originally Posted by Aender69 View Post
Yes it does.
Back from my evening soaring. 15 % flaperons, -10 % elevator on the Aurora, and she soars like a kitten... CoG on or a bit behind 80 mm.
Kudos, I haven't even played with the flapperons yet, so that's cool.
I was using my U.S. public school system math before.
Here's the specs I plugged in:

Calculate Wing Loading, Area & Stall Speed
Wingspan:
60.4 inches
1533 mm
Wing Root Chord:
6 inches
152 mm
Wing Tip Chord:
4.5 inches
114 mm
Or the Average Chord:
5.3 inches
133 mm
Or the Wing Area:
320 sq.in
8128 sq.dm?
Model Weight:
37 ounces
1048 grams
Max Lift Coefficient:
1.0
WING LOADING:
16.64 oz/sq.ft
51 g/sq.dm

CUBIC LOADING:
11.16 oz/cu.ft.
STALL SPEED:
20.2 mph
32.5 Km/h
Note: Just got back from putting 3 more flights in with 3S. During slow flight, stall tests, it turned over pretty hard. I needed(without the motor,)about 75ft of altitude to recover. That's clean without any flapperons set.
Kev
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Last edited by kmdunnster; Jul 02, 2012 at 07:51 PM.
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Old Jul 02, 2012, 07:02 PM
Lipo Burner
dcame002's Avatar
United States, FL, Sunrise
Joined Mar 2012
601 Posts
I wonder how heavy my esc is compared to stock. Can anyonene compare? I am using a 60 gram esc and a 296 gram battery
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Old Jul 02, 2012, 07:44 PM
Registered User
United States, CA, Los Angeles
Joined Mar 2012
52 Posts
Quote:
Originally Posted by kmdunnster View Post
Kudos, I haven't even played with the flapperons yet, so that's cool.
I was using my U.S. public school system math before.
Here's the specs I plugged in:

Calculate Wing Loading, Area & Stall Speed
Wingspan:
60.4 inches
1533 mm
Wing Root Chord:
6 inches
4.5 mm
Wing Tip Chord:
4.5 inches
114 mm
Or the Average Chord:
5.3 inches
133 mm
Or the Wing Area:
320 sq.in
sq.dm
Model Weight:
37 ounces
1048 grams
Max Lift Coefficient:
1.0
WING LOADING:
16.64 oz/sq.ft
51 g/sq.dm

CUBIC LOADING:
11.16 oz/cu.ft.
STALL SPEED:
20.2 mph
32.5 Km/h
Note: I needed(without the motor,)about 75ft of altitude to recover. That's clean without any flapperons set.
Kev
75' is a great distance. You had to be way up there in order to test that. 20mph stall speed? That's also a good clip. Seems like this thing likes to go fast!
Good info Bro! Thanks.
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Old Jul 02, 2012, 07:56 PM
Cross your Fingers
kmdunnster's Avatar
Long Beach, CA
Joined Mar 2010
999 Posts
Hey V, yeah I went up to about 250' to do some unusual attitude/stall spin tests, and yes, it turns over pretty hard, 75' to recover may have been an exaggeration, but 50' for sure. You gotta remember, I chopped the power, then just kept the same AOA, bled off speed until... spin city. Just don't do it low! With a power on recovery, no problem, 10-15'. You gotta remember those numbers are just what's on paper. A little camber with the flapperons, I'm sure you could get the stall speed down, and who knows what else is possible..:
Kev
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Last edited by kmdunnster; Jul 02, 2012 at 08:27 PM.
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Old Jul 03, 2012, 12:37 AM
Registered User
United States, CA, Los Angeles
Joined Mar 2012
52 Posts
I'm glad to see all the real world testing going on with the V70. I bought it b'cz I like fast gliders and wanted to try out an EDF. So it fit the bill in two ways.
I've been following this thread but have been working on my 3D skills. I've got a nice bipe to get to know better. I was on deck to by another hotliner but the guy sold it from under me, so I guess I'll keep an eye out still. F5B is where my heart is and the Zephyer is great to have fun with on a different level. Gotta love those RG15 foils! I need to get mines up with yours soon.
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Old Jul 03, 2012, 01:01 AM
WiggleWiggleWiggle
ozzi supercub's Avatar
South Australia
Joined Jan 2008
6,047 Posts
Thats the beauty of this community. When fellow flyers and lovers of RC get their models and fly them we find out the true nature of a model. Even better when a video is seen. While probably not model of the year it is a very cool concept and kudos to Hobbyking for trying something different.
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Old Jul 03, 2012, 01:19 AM
Registered User
Canada, BC, Burnaby
Joined Oct 2010
247 Posts
rain rain rain

no chance to fly making time lapse video in backyard wait for rain to stop

West sechelt bc sea watch time lapse. panasonic HC-X900MK (0 min 38 sec)
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Old Jul 03, 2012, 02:02 AM
Registered User
Chilliwack, BC Canada
Joined Mar 2010
1,092 Posts
Quote:
Originally Posted by Westwood View Post
no chance to fly making time lapse video in backyard wait for rain to stop

http://www.youtube.com/watch?v=njAhv1G5FCc
Great video! Looks pretty familiar. More rain forecast for tomorrow, but the Fraser has gone down enough that the FVRCF's field is almost all above water again!


Gord
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Old Jul 03, 2012, 02:50 AM
Registered User
Wretcho's Avatar
Australia, WA, Osborne Park
Joined Jul 2011
117 Posts
I've made a thrust tube to try on the weekend!
Will report thrust gained with 3s plus watts/amps ect.
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Old Jul 03, 2012, 02:55 AM
WiggleWiggleWiggle
ozzi supercub's Avatar
South Australia
Joined Jan 2008
6,047 Posts
Is it tapered? Exit diameter should be around 58mm. It will increase the speed of the air coming out the back. Kind of like putting your finger tip over the end of the garden hose.
Where's Gerry gone?
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Old Jul 03, 2012, 03:16 AM
Registered User
Joined Feb 2009
10 Posts
Durafly Zephyr - GoPro Hero 2 1080p HD

Maiden flight had a receiver brown out (orange receiver w/satellite). It flew perfectly fine this day with a Spektrum receiver w/satellite. I think with the cramped cockpit, large battery, 2.5 ounces lead in the nose and esc that the signal got lost on a straight towards me approach. This is my 2nd flight. I flew a total of 3 times this day.

Spektrum DX8, Blue Lipo 3300mah 40C (extremely tight fit)
The sound alone is worth the $$$ of this plane.

Bad quality here on embedded view of video ... go to youtube to select 1080p quality

Durafly Zephyr - GoPro Hero 2 1080p HD (4 min 41 sec)
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Last edited by WyoRip; Jul 05, 2012 at 01:55 PM.
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Old Jul 03, 2012, 04:02 AM
Grand-Duchy of Luxembourg
Aender69's Avatar
Joined Sep 2005
258 Posts
Nice landing. I found out that one should try to bleed out speed after the downwind run (a circle, beware of stall), before entering final approach.

If it's tight, I fly S-curves in final approach...


OMG, at 4.40, there is definitely a UFO on the upper right...
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Old Jul 03, 2012, 04:02 AM
Return To Kit Form
R.T.K.F's Avatar
Australia, WA, Joondalup
Joined Oct 2010
99 Posts
More V70's invade Perth

Gents,
Down under must have a good captive breading program..
Just received my V70 today, so Perth's sky's will have another screaming banshee soon..
Cheers to all those who posted tips, reading them has helped heeeep's..

Brad.
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Old Jul 03, 2012, 04:43 AM
Registered User
Joined Aug 2011
756 Posts
Since i blew up my stock 6 blade zephyr rotor and i am waiting for Scott to advise on replacement spares i have installed a wemo 5 blade rotor into the stock zephyr housing for the interim.
Amp draw on 3s is down to 32A and on 4s is 52A (static bench tests in airframe.)
Measured thrust still seemed pretty good for 3s at around 550g
Will have to wait until the flight test on Saturday to determine if performance is comparable.
Flight times should be better as it is drawing alot less current.
One thing i have noticed on the bench tsting is it doesn't have that same woooosh sound the stock 6 blade rotor.
We'll make sure to capture everything on video (good or bad)
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