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Old Jan 01, 2013, 04:23 AM
arun.sreelakam is offline
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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, 09:47 AM
vlatko is offline
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Here's the photo of the rubber skid.

Old Jan 01, 2013, 09:59 AM
arun.sreelakam is offline
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@vlatko


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

i was thinking for a thicker covering..
Old Jan 01, 2013, 01:33 PM
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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.
Old Jan 01, 2013, 11:23 PM
arun.sreelakam is offline
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@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..
Old Jan 02, 2013, 11:11 PM
Kazu-kaku is online now
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When I look at a video,
Your clothes are not shaken.
A thrust of ornithopter may be weak.

Look attached file.
Old Jan 03, 2013, 12:03 AM
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I think maybe the diagonal batten extends too far along the spar there for too much lift panel not enough thrust panel regards Brian
Old Jan 03, 2013, 02:29 AM
arun.sreelakam is offline
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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..
Old Jan 03, 2013, 02:35 AM
arun.sreelakam is offline
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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?
Old Jan 03, 2013, 07:24 AM
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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
Last edited by therealthing691; Jan 04, 2013 at 05:42 AM.
Old Jan 03, 2013, 08:36 PM
arun.sreelakam is offline
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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..
Old Jan 03, 2013, 11:46 PM
samwei1950 is offline
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DIY Mania from Taiwan
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
Old Jan 04, 2013, 05:00 AM
arun.sreelakam is offline
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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?
Old Jan 04, 2013, 06:23 AM
samwei1950 is offline
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DIY Mania from Taiwan
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
Old Jan 04, 2013, 10:26 AM
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@sam


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


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