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Old Aug 15, 2012, 05:22 PM
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Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
27,705 Posts
He wasn't asking about the pitot tube. He's talking about the barometric
altitude sensor. Generally speaking it is recommended to be installed
in a "sealed chamber" with a single port to the outside that is
neither in the front or back of the craft (thus usually opening
to the side) with no obstructions (anything that'd cause turbulence
and buffeting) upwind of the port.

Personally I wouldn't worry too much about ram air effect into
the fuse as I suspect it's quite negligible, but I don't have such a sensor
so can't say for sure. The chamber under the wing is nice, but
it has openings in the bottom and the rear so it's nowhere near sealed.

ian
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Old Aug 15, 2012, 09:56 PM
Fly Chitty Chitty Bang Bang!
EarthOrbiter's Avatar
Central California USA
Joined Feb 2011
377 Posts
Barometric reference mounting location

It is hard to find a neutral point where the environmental barometric pressure is equivalent to the outside in a flow free situation on any plane or structure that changes velocity (speed) and angles.
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Old Aug 16, 2012, 02:54 AM
Houba ! Houba !!
rcmonster99's Avatar
United Kingdom, England, Milton Keynes
Joined Sep 2003
5,872 Posts
Quote:
Originally Posted by Vlodek9 View Post
Hi all,
Well I do not post much because your guys videos put me to shame. But this last Sunday I had some positive test results with my SW, new DX18 and ET OSD. I know this video may be a bit simple and nothing exciting but for me its progress. So here is my quick update.

http://www.youtube.com/watch?v=HJCjg0BJbnU
you nailed the landing smack on the centre line
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Old Aug 16, 2012, 08:18 AM
Registered User
Poland, Lubuskie, Lipinki
Joined Oct 2011
21 Posts
Skywalker---Touch the clouds!

Skywalker 1900

skywalker and clouds .mp4 (17 min 43 sec)


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Old Aug 16, 2012, 09:46 AM
Registered User
Joined May 2010
81 Posts
Twisted tail

My first Skywalker is almost complete...or so I thought.

I was really careful when gluing the two fuselage halves together, but the tail looks twisted. The vertical stabilizer is perpendicular to the horizontal stabilizer, but the horizontal stabilizer does not line up with the wing. I have seen several Skywalkers on the web with the same problem. I should have been more careful when joining the halves!

Is it possible to do something about it?
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Old Aug 16, 2012, 09:56 AM
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snelan's Avatar
Joined Jul 2012
413 Posts
You can always just use some tape in a spiral fashion around the boom to straighten it out to one side. Who knows, it could have been twisted in shipment or something.
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Old Aug 16, 2012, 10:03 AM
Registered User
United States, IN, Carmel
Joined Jan 2008
2,208 Posts
what happens when you roll the plane on the other side? Does the horizontal stabilizer tilt the other way?

If yes then it's a typical rigidity problem - Skywalker style!

There are many proposed solutions to this, depending on how much time and effort do you feel like investing to correct it.

First of all, did you properly glue the carbon tube in the tail boom's channel? If not the you should - It's never too late. Just make some small holes in the EPO foam every inch or so and inject CA with a needle. Stick with the needle if you want.

Then you can use internal (more or external carbon fiber scafolding to further increase rigidity. The easiest way is to glue 3-5mm rods diagonally between the tail boom and horizontal stabilizer's lower surface - close to the tips.
Of course you'll have to push both rod's ends a few mm into the foam.

Good luck with your maiden!

/Dimitrios
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Old Aug 16, 2012, 10:05 AM
Registered User
United States, IN, Carmel
Joined Jan 2008
2,208 Posts
Quote:
Originally Posted by RC4YFPV View Post
Yes,Now Black EPO Skywalker for $100,end of 31,August.Only left about 15 days,
http://www.rc4y.com/skywalker-1880-e...ery-p-472.html
don't hesitate,if you want to buy.
You can see the pictures, it shows different.

I need to order another Skywalker.

What do you guys think about this offer? I have read somewhere that's a scam webshop. They do take Paypal for protection though...

What's the verdict?

/Dimitrios
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Old Aug 16, 2012, 10:06 AM
Whats the wrst that can happn?
AdamChicago's Avatar
Chicago, IL USA
Joined May 2010
2,538 Posts
thanks for the help...I'm going to try it in the main fuse cabin and compare with GPS to see if there any major deviations.

Quote:
Originally Posted by Daemon View Post
He wasn't asking about the pitot tube. He's talking about the barometric
altitude sensor. Generally speaking it is recommended to be installed
in a "sealed chamber" with a single port to the outside that is
neither in the front or back of the craft (thus usually opening
to the side) with no obstructions (anything that'd cause turbulence
and buffeting) upwind of the port.

Personally I wouldn't worry too much about ram air effect into
the fuse as I suspect it's quite negligible, but I don't have such a sensor
so can't say for sure. The chamber under the wing is nice, but
it has openings in the bottom and the rear so it's nowhere near sealed.

ian
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Old Aug 16, 2012, 10:27 AM
Registered User
snelan's Avatar
Joined Jul 2012
413 Posts
Quote:
Originally Posted by Dimitris76 View Post
what happens when you roll the plane on the other side? Does the horizontal stabilizer tilt the other way?

If yes then it's a typical rigidity problem - Skywalker style!

There are many proposed solutions to this, depending on how much time and effort do you feel like investing to correct it.

First of all, did you properly glue the carbon tube in the tail boom's channel? If not the you should - It's never too late. Just make some small holes in the EPO foam every inch or so and inject CA with a needle. Stick with the needle if you want.

Then you can use internal (more or external carbon fiber scafolding to further increase rigidity. The easiest way is to glue 3-5mm rods diagonally between the tail boom and horizontal stabilizer's lower surface - close to the tips.
Of course you'll have to push both rod's ends a few mm into the foam.

Good luck with your maiden!

/Dimitrios
I actually used a 3mm x10mm x ~100mm CF rod in my Vertical stab before I glued it shut, seems to help a bit compared to my other SW. Not in the warping issues some have (luckily I don't) but in the whole, "my tail wobbles on hard landings issue".
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Old Aug 16, 2012, 06:15 PM
If it's to be, it's up to me.
subsonic's Avatar
Sydney, Australia
Joined Jan 2007
2,870 Posts
Quote:
Originally Posted by XDreamer View Post
My first Skywalker is almost complete...or so I thought.

I was really careful when gluing the two fuselage halves together, but the tail looks twisted. The vertical stabilizer is perpendicular to the horizontal stabilizer, but the horizontal stabilizer does not line up with the wing. I have seen several Skywalkers on the web with the same problem. I should have been more careful when joining the halves!

Is it possible to do something about it?
If the vertical is truely perpendicular to the horizontal like you say, (mine had to be adjusted) I'd just shim the wing to ensure it's parralel with the horizontal stabiliser. You could either add tape under one side of the saddle, or lightly sand the high side.

Sub
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Old Aug 16, 2012, 09:39 PM
Fly Chitty Chitty Bang Bang!
EarthOrbiter's Avatar
Central California USA
Joined Feb 2011
377 Posts
Tail flutter.

Quote:
Originally Posted by Dimitris76 View Post
what happens when you roll the plane on the other side? Does the horizontal stabilizer tilt the other way?

If yes then it's a typical rigidity problem - Skywalker style!

There are many proposed solutions to this, depending on how much time and effort do you feel like investing to correct it.

First of all, did you properly glue the carbon tube in the tail boom's channel? If not the you should - It's never too late. Just make some small holes in the EPO foam every inch or so and inject CA with a needle. Stick with the needle if you want.

Then you can use internal (more or external carbon fiber scafolding to further increase rigidity. The easiest way is to glue 3-5mm rods diagonally between the tail boom and horizontal stabilizer's lower surface - close to the tips.
Of course you'll have to push both rod's ends a few mm into the foam.

Good luck with your maiden!

/Dimitrios
This plane is subject to Tail flutter more than most.
http://www.wired.com/autopia/2010/03...ting-aircraft/
Increasing rigidity will help. I have found that a speedy decent with the prop off will make a gopro jello effect very prominent. At some certain speed depending on how rigid your structure is it will oscillate.
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Old Aug 17, 2012, 02:57 AM
On a holiday?
boopidoo's Avatar
Uppsala, Sweden
Joined Sep 2008
3,473 Posts
Is the V4 still available and in-stock somewhere. I don't really like the single spar and it doesn't work with the modifications I've done.

Or, maybe someone has a SW V4 in parts (or built) or crashed and willing to part with it?
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Old Aug 17, 2012, 03:19 AM
Registered User
United States, IN, Carmel
Joined Jan 2008
2,208 Posts
Oh maaan!

Same here... I need another Skywalker with the older version's double spar wing.

Please, let me know too (PM) if you find a store with new-old stock!

/Dimitrios
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Old Aug 17, 2012, 06:15 AM
You can't take the sky from me
Rastislavko's Avatar
Slovakia, Bratislava Region, Bratislava
Joined Jun 2006
748 Posts
During the holiday I was flying in Bardejov, small old city in Slovakia. It was quite windy, so sorry for shaky picture...

FPV Bardejov (2 min 39 sec)

Here is the picture of my Skywalker when I was landing. I'm very satisfied with the front position of GoPro - no airplane nose in the picture and almost no GoPro in the picture of FPV camera...
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