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Nov 07, 2009, 04:36 AM
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#91 |
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Registered User
Join Date: Mar 2004
Location: Klatovy, Czech Republic
Posts: 2,379
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Rudi i would really maiden it on snow... its a loteasier to get her off than off water and there will be no need to "pull" her off if the step doesn`t provide proper water seperation.
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Nov 08, 2009, 03:03 AM
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#92 | |
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Rudi_Privat
Join Date: Aug 2009
Location: Laakirchen
Posts: 10
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Quote:
no chance because I hate when it is freezing outside and I should fly a new model. No, no I have no hurry. Can you help me with the CG. P.Angus draw at 26 % MAC from the root ? Does it mean that if the root is apr. 100mm that the CG is at 26 mm ? Many thx Rudi |
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Nov 08, 2009, 03:55 AM
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#93 |
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Registered User
Join Date: Oct 2007
Location: Norwich.uk.
Posts: 261
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Well done Rudi.
This link might be of use to you. Generally the CG is 1/2 inch forward of step. http://www.seminolerc.com/EZ-Float-Design.html |
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Nov 08, 2009, 04:14 AM
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#94 |
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Registered User
Join Date: Mar 2004
Location: Klatovy, Czech Republic
Posts: 2,379
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Rudi have alook here how to construct the MAC. you will need to draw it into your plans as your wing is tapered and not a straight wing to construct it. http://www.lferc.com/Tips/mean_aerodynamic_chord.php
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Nov 08, 2009, 05:32 AM
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#95 |
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This is my other autogyro!
Join Date: May 2006
Location: Live in Inverness, Scotland, work away.
Posts: 1,784
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Hi Rudi,
 No doubt about it, "The finest Sunderland ever seen !" For what it's worth, my C/G is 20% of the root chord at the fuselage side, and she flys ok, the only thing I have problems with is the pitch couple with power changing up and down, as I reduce power on approach the nose comes up, not the ideal sense. Good luck when ever you chose to fly her, if it were me I would fly off the snow or grass, but it's for you to choose. Cheers, regards to all, Al  eps I did hear that Von Smallhausen escaped the Gulf and is somewhere in Europe, take care of those U boots mate
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Nov 08, 2009, 09:31 AM
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#96 |
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Registered User
Join Date: Dec 2003
Location: Blackpool, Great Britain (UK)
Posts: 819
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Why all this CG controvercy?
My plans clearly state 3.2" aft of the bodyside LE. This is 25%MAC, and 30% of bodyside chord. My original has impeccable flying manners, so it would be wise to follow suit. ------------------------------------------------------------------------- The balsa original, flown in 1996, with can motors and NiCads,weighed 64oz. Currently, with b'less and lipos, its weight is 54oz. Rudi's model weighs just half of that, and it's waterproof! Real progress!!. [I am now stocking up with Depron] ------------------------------------------------------------------------- Rudi......we are all waiting impatiently for the good news next January. Last edited by peterangus; Nov 08, 2009 at 05:52 PM. |
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Nov 09, 2009, 02:56 AM
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#97 | |
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Registered User
Join Date: Jan 2001
Location: Vienna Schwechat, Austria
Posts: 2,808
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Quote:
no CG Discussion. I will use your information exact as it is drwan in your plans but for my sorrow I have to announce that in my documents only the drawings with the 26 % MAC infois aviable  So the CG is 3,2" (3,2 x 2,54 = 8,128 cm) from the LE back, correct ? January is far to early. I will wait till we can swimm again in our beautiful lakes again because I have no boat in case I have to rescure the model  Now I have programmed my TX and I have to make a testrun in our small fish water near our house. Hope that the hull have no leak Will make a small video of that issue .Rudi |
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Nov 09, 2009, 03:03 AM
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#98 | |
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Registered User
Join Date: Jan 2001
Location: Vienna Schwechat, Austria
Posts: 2,808
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Quote:
sorry but this side is chaos pur ! I can't even read the start side  Never the less thx. Rudi |
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Nov 09, 2009, 03:07 AM
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#99 | |
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Registered User
Join Date: Jan 2001
Location: Vienna Schwechat, Austria
Posts: 2,808
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Quote:
many thx but I get the info I want from Peter Angus. It seems that my .zip file was not complete with all neccessary infos e.g. CG Rudi |
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Nov 16, 2009, 02:49 AM
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#100 |
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Registered User
Join Date: Jan 2001
Location: Vienna Schwechat, Austria
Posts: 2,808
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Hi Guys,
fixed the floaters and the cockpit windows. Now the Sunderland is ready for the maiden. CG is exact at 8,128 cm or 3,2 "  with 2S1800 mAh or 2200 mAh Lipo without and need of ply Rudi |
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Nov 16, 2009, 08:06 AM
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#101 |
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Registered User
Join Date: Aug 2003
Location: Ridgefield, CT
Posts: 1,286
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Rudi,
It looks wonderful. I'm sure we are all waiting on the first flight report. Thayer |
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Nov 17, 2009, 12:45 AM
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#102 | |
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Registered User
Join Date: Jan 2001
Location: Vienna Schwechat, Austria
Posts: 2,808
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Quote:
Rudi |
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