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Old Jan 01, 2013, 03:23 AM
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Joined Jun 2012
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@rick

no grassed place over here for me...
i am looking forward for a rubber or foam skid as you mentioned.. but cant find any picture like that for reference..
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Old Jan 01, 2013, 08:47 AM
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vlatko's Avatar
Croatia
Joined Feb 2006
49 Posts
Here's the photo of the rubber skid.

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Old Jan 01, 2013, 08:59 AM
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Joined Jun 2012
37 Posts
@vlatko

man but is it enough to save the birdie from a crash?

i was thinking for a thicker covering..
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Old Jan 01, 2013, 12:33 PM
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n553302's Avatar
Northwestern Illinois
Joined Jan 2003
189 Posts
Your bird's air frame is apparently built from fiberglass just as the SK birds are (my SK birds frames are 1.5mm thick) and glass is really quite impact resistant. As for 'crash protection', not crashing is the only way to prevent damage.
When landing always lite as flat as possible, wings straight out or up allowing the frame to take the landing rather than the wing spars. Your more incline to snap a wing spar if a tip connects with the ground than break the frame. Another option would be to catch it.
On this forum in the past I've read post about bearing problems when landing on sand and one fellow carried compressed air with him to clean the gearbox when contaminated. I purchased a SK bird from a group member some time ago and this member flew near sand and must of landed in it at some time because a couple of the bearings were crunchy sounding and needed to be replaced.
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Old Jan 01, 2013, 10:23 PM
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Joined Jun 2012
37 Posts
@rick

i just made a thermocol covering to protect the bird in my maiden.. lets see what happens...
the material is 1.5 mm thick frp sheet(here in india it is known like this)
will upload the maiden result soon man.. thanks for your help..
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Old Jan 02, 2013, 10:11 PM
K Kakuta
Kazu-kaku's Avatar
Joined Aug 2006
1,126 Posts
When I look at a video,
Your clothes are not shaken.
A thrust of ornithopter may be weak.

Look attached file.
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Old Jan 02, 2013, 11:03 PM
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therealthing691's Avatar
australia
Joined Apr 2007
2,121 Posts
I think maybe the diagonal batten extends too far along the spar there for too much lift panel not enough thrust panel regards Brian
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Old Jan 03, 2013, 01:29 AM
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Joined Jun 2012
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@kazu-kaku

Sir let me try it by adding an extra cf rod as you mentioned..
will check it and update the results..
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Old Jan 03, 2013, 01:35 AM
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Joined Jun 2012
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@brian

Quote:
Originally Posted by therealthing691 View Post
I think maybe the diagonal batten extends too far along the spar there for too much lift panel not enough thrust panel regards Brian
sir actually I got this image from rcgroups (don't remember from where)
this was what my wing reference not the same dimensions but my own calculations..
that's why I extended the diagonal spar that much.. will it harm my bird?
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Old Jan 03, 2013, 06:24 AM
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therealthing691's Avatar
australia
Joined Apr 2007
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@brian

--------------------------------------------------------------------------------

Quote:
Originally Posted by therealthing691
I think maybe the diagonal batten extends too far along the spar there for too much lift panel not enough thrust panel regards Brian

sir actually I got this image from rcgroups (don't remember from where)
this was what my wing reference not the same dimensions but my own calculations..
that's why I extended the diagonal spar that much.. will it harm my bird?








it will give less thrust but what DR kazu says will give more in my opinion cheers Brian
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Last edited by therealthing691; Jan 04, 2013 at 04:42 AM.
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Old Jan 03, 2013, 07:36 PM
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Joined Jun 2012
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@brian

Quote:
Originally Posted by therealthing691 View Post
it will give less thrust but what DR kazu says will give more in my opinion cheers Brian
i am working on it right now.. lets see the difference..
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Old Jan 03, 2013, 10:46 PM
DIY Mania from Taiwan
Taiwan
Joined Aug 2011
1,934 Posts
Suggest to have 10-15 degree attack angle after CG determined when maiden your lovely scratchbuilt orni,or the bird may not be able to lift
have great flapping fun
regards
Sam
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Old Jan 04, 2013, 04:00 AM
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Joined Jun 2012
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@sam

Quote:
Originally Posted by samwei1950 View Post
Suggest to have 10-15 degree attack angle after CG determined when maiden your lovely scratchbuilt orni,or the bird may not be able to lift
have great flapping fun
regards
Sam
sam i didnt get you..
what you mean by an attack angle?
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Old Jan 04, 2013, 05:23 AM
DIY Mania from Taiwan
Taiwan
Joined Aug 2011
1,934 Posts
Quote:
Originally Posted by arun.sreelakam View Post
sam i didnt get you..
what you mean by an attack angle?
Means 10-15 degree tail tilt upward
regards
Sam
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Old Jan 04, 2013, 09:26 AM
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Joined Jun 2012
37 Posts
@sam

sir actually i already done that and set it to 20 degrees now..
thanks for your suggestion..
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