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Old Jul 16, 2012, 04:23 PM
Foam Snow
South Africa, WC, Cape Town
Joined Aug 2011
1,334 Posts
Quote:
Originally Posted by wep View Post
"crashed" my skywalker.......

Well, it actually made half of the flight totally on it's own cause I lost all (read ALL) power...
Think the main accu connection was loose.... (not sure yet)

https://vimeo.com/45820998

99% land.....1% water in the neighbourhood....AAHH
Oh noes! I'm sure electronics is fine though - power was disconnected so maybe it's just the batteries.

P.S. Love the launcher

P.P.S Luckily you were already in the car so it's just pedal to the metal
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Old Jul 16, 2012, 05:43 PM
Whats the wrst that can happn?
AdamChicago's Avatar
Chicago, IL USA
Joined May 2010
2,694 Posts
Might be time to add RTH to your setup



Quote:
Originally Posted by wep View Post
"crashed" my skywalker.......

Well, it actually made half of the flight totally on it's own cause I lost all (read ALL) power...
Think the main accu connection was loose.... (not sure yet)

https://vimeo.com/45820998

99% land.....1% water in the neighbourhood....AAHH
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Old Jul 16, 2012, 05:53 PM
Whats the wrst that can happn?
AdamChicago's Avatar
Chicago, IL USA
Joined May 2010
2,694 Posts
Ian, that is really reckless, flying with full scale ultra lights...one wrong maneuver or equipment failure and you could have taken one of those guys out!!!!! I'm not one to blindly follow the rules but this is blatantly dangerous! And if the anti-FPV movement gets a hold of that video it will be used against all of us...please remove!


Quote:
Originally Posted by Daemon View Post
The angle of incidence of main wing and horizontal stab are quite different. (decalage)
What this means is the SW is already carrying around quite a lot of static up elevator trim.
If you're flying with zero visible elevator trim, then your horizontal stab is generating
quite a lot of downforce to balance the weight in the nose, with the CG over an inch in front
of where it should be. That downforce reduces your net positive lift. A more optimal
CG is closer to the center of lift requiring less downforce and thus greater net positive lift.
Because of the built in decalage though, it means you have to actually dial in some visible
downtrim (or shim the whole stab) to fly level.

And the CG is not that random of a subject in this thread. It comes up every few pages
and the answer is the same, almost every time. Some folks fight against what we
tell em, but they usually come around if they bother to experiment (move CG back, dial in
downtrim, reduce elevator throws).

Here's the Skywalker soaring with the CG *more* than 30mm behind the servo wiring slots.
https://vimeo.com/24670647
At stock CG, it soars like a brick, by comparison.

Another one, same CG, on and off the power with no pitch changes.
http://www.youtube.com/watch?v=O8HtLPrtxIk

How about aerobatics?
https://vimeo.com/33468363
How's your SW handle an inverted 360 degree turn?

ian
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Old Jul 16, 2012, 07:36 PM
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Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
29,105 Posts
Says the guy who flies over Chicago proper.
Look, we've been through this in the past. These PG and HG pilots are my
friends, and I've flown FPV and LoS with em for years and they love my vids. They don't
have an issue. I'm using only a tiny fraction of the available control and video range at this
location so not going to suddenly lose control. We fly LoS RC sailplanes of all shapes and
speeds here as well without issue (as people do at Point of the Mountain, and Torrey Pines
and many other locations). It's actually easier to maintain situational awareness in
this environment while FPV piloting.

ian
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Old Jul 16, 2012, 08:36 PM
Whats the wrst that can happn?
AdamChicago's Avatar
Chicago, IL USA
Joined May 2010
2,694 Posts
Like I said I'm less about the rules and more about practical personal responsibility...that video literally makes me cringe and I fear for their safety. And think about yourself and us too....Godd forbid something happen, you'll take us all down with you IMO.

Some idiott currently has footage flying a 700 size FPV heli right over the heads of a crowd of people, you could only imagine the carnage if there was an accident.

All I'm saying is have have fun and tear it up, but please stop the totally obvious risky FPVing...at least don't post it.
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Old Jul 16, 2012, 11:53 PM
Registered User
San Marcos, CA
Joined Aug 2009
2,871 Posts
Don't come to Socal because you might get a stroke - we fly FPV next to real jets here! .. all with approval of the FAA and the local Tower of course! Heck we even have an RC airfield right in the departure zone of an major airport..
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Old Jul 17, 2012, 12:26 AM
Whats the wrst that can happn?
AdamChicago's Avatar
Chicago, IL USA
Joined May 2010
2,694 Posts
That sounds awesome!


Quote:
Originally Posted by flyandi View Post
Don't come to Socal because you might get a stroke - we fly FPV next to real jets here! .. all with approval of the FAA and the local Tower of course! Heck we even have an RC airfield right in the departure zone of an major airport..
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Old Jul 17, 2012, 01:02 AM
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Shadrack's Avatar
Winnipeg
Joined Feb 2002
5,969 Posts
Quote:
Originally Posted by Daemon View Post
Says the guy who flies over Chicago proper.
Look, we've been through this in the past. These PG and HG pilots are my
friends, and I've flown FPV and LoS with em for years and they love my vids. They don't
have an issue. I'm using only a tiny fraction of the available control and video range at this
location so not going to suddenly lose control. We fly LoS RC sailplanes of all shapes and
speeds here as well without issue (as people do at Point of the Mountain, and Torrey Pines
and many other locations). It's actually easier to maintain situational awareness in
this environment while FPV piloting.

ian
In full agreement.
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Old Jul 17, 2012, 01:26 AM
Foam Snow
South Africa, WC, Cape Town
Joined Aug 2011
1,334 Posts
Quote:
Originally Posted by AdamChicago View Post
Might be time to add RTH to your setup
He's still gonna need power for that
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Old Jul 17, 2012, 05:41 AM
Registered User
Joined Jun 2004
840 Posts
Ok so coming from a Z2 into a Skywalker I'm extremely worried about durability of my SW. So I'm taking as much precaution as I can to strengthen the wing and fuselage.

First step was the wing... Looking at the stock CF tube, it was of poor quality and was not fitting correctly. I ordered some specialist roll wrapped CF tube and the difference in quality is clear.

Firstly the chinese tube is not uniformly wrapped, it also has two clear layers in the tube which are not CF, probably too much shrink wrap. (its part of the roll wrapped process).

Second the tube is not well fitted into the wing, it allows too much flex and is not secure.

So I ordered some 10mm/8mm (outer/inner) diameter tube from a local specialist composite company : http://www.easycomposites.co.uk/

The new tube fits PERFECT. Beautifully snug. You can see the quality difference here: guess which is which?

http://i.imgur.com/C52L0.jpg
http://i.imgur.com/SF40h.jpg
http://i.imgur.com/MOeRm.jpg
http://i.imgur.com/A9AM8.jpg

From the same company I picked up some 10mm wide, 0.5mm thick CF strip, and I cut a long straight line the full length into the wing and embedded the strip before gluing with CA. Just one strip has already made a huge difference and I have 3 more. Each wing will have one on top and one underneath as pictured:

http://i.imgur.com/Uiucr.jpg

What do you think so far?
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Last edited by Dogzilla; Jul 17, 2012 at 06:22 AM.
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Old Jul 17, 2012, 09:26 AM
I tell her RC is cheap !
carguy1994ca's Avatar
Quebec, Canada
Joined Sep 2006
13,338 Posts
Quote:
...However, what's even better is to trim it in the air, land, measure how much elevator
deflection you have, then center the radio trim, and move the position of the elevator mechanically
by screwing in the clevis, till it matches the deflection you measured.

Ian
Good info, but really, this is RC basic. Always adjust your linkages mechanically so the radio trims are neutral or with minimal trim or subtrim. LOS club flying background still has its advantages Should we have a basic RC flying tread in the FPV forum for the RC newbies getting in the hobby by the FPV side ?
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Old Jul 17, 2012, 11:57 AM
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Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
29,105 Posts
Quote:
Originally Posted by Dogzilla View Post
From the same company I picked up some 10mm wide, 0.5mm thick CF strip, and I cut a long straight line the full length into the wing and embedded the strip before gluing with CA. Just one strip has already made a huge difference and I have 3 more. Each wing will have one on top and one underneath as pictured:

http://i.imgur.com/Uiucr.jpg

What do you think so far?
As I got done explaining only a couple pages back, carbon ribbon spars should be installed
above and below each other, at the thickest (or as close as is practical) part of the wing to add maximum rigidity.
The rigidity goes up by roughly the third power of the distance between the ribbons.

ian
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Old Jul 17, 2012, 01:22 PM
Registered User
Joined Jun 2004
840 Posts
Quote:
Originally Posted by Daemon View Post
As I got done explaining only a couple pages back, carbon ribbon spars should be installed
above and below each other, at the thickest (or as close as is practical) part of the wing to add maximum rigidity.
The rigidity goes up by roughly the third power of the distance between the ribbons.

ian
Hi Ian, oops a bit late for me as I've already glued them in. I have 10mm wide stuff so I didn't want to stack them ontop as they wouldn't fit. And I didn't wanna put them too close either.

I ended up with this :

http://i.imgur.com/pNGOX.jpg
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Old Jul 17, 2012, 03:52 PM
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Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
29,105 Posts
Ya, shame about that. A carbon ribbon installed on only one side of the wing, is kind
of like the the sound of one hand clapping.
They're meant to work in pairs.

ian
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Old Jul 17, 2012, 07:01 PM
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joel0407's Avatar
Australia, NT, Lyons
Joined Oct 2010
654 Posts
Quote:
Originally Posted by Daemon View Post
Ya, shame about that. A carbon ribbon installed on only one side of the wing, is kind
of like the the sound of one hand clapping.
They're meant to work in pairs.

ian
Whilst I agree that having CF strips on only one side is not as good as 2, I don't think it's so bad as one hand clapping.

As I understand, when foam bends, the foam on the inside compresses and the foam on the outside stretches until it finally starts to tear apart. Once it starts to tear, its strength diminishes and the resulting break or continuation of the tear though the foam happens very quickly.

Adding a CF strip to the bottom of the wing will go a long way to stopping the wing breaking.

I also run a bead of glue along my CF rod/spare and twisted it as I installed it, bonding it to the foam. My wing is one piece.

Happy Days.
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