SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Feb 21, 2013, 11:41 PM
I love my HammerHead wing...
sgrouts's Avatar
Joined Jun 2012
708 Posts
GooberSB, I really hope you are right about cg. And you know, besides looks and rigidity, getting cg was one of the reasons I made it non swept.

Postaflyer and Rcwork, you are right about moving motor, this way I transfer weight forward, but all my other swept wings that I made are cut (look my avatar...) I am postponing this surgery until there is no alternative.
I don't like the looks of it, I loose valuable surface, and everything gets noisy and unstable. Maybe by adding a fuse I will get more pitch stability.
Regarding light wing beeing unstable, I have full faith to FY31AP autopilot to keep everything smooth and level.
Steve, for sure I converted my wing from top model to a fat housewife

Thank you all for giving me ideas, I will try this way and after that if I still have a wing ( ) I will proceed to another solution.

Sakis
sgrouts is online now Find More Posts by sgrouts
RCG Plus Member
Sign up now
to remove ads between posts
Old Feb 23, 2013, 06:51 AM
I don't like your altitude
Stupot46's Avatar
Joined Sep 2011
3,287 Posts
Id be tempted to fit some taller fins till the other issues are sorted.
Stupot46 is offline Find More Posts by Stupot46
Reply With Quote
Old Feb 23, 2013, 11:23 AM
I love my HammerHead wing...
sgrouts's Avatar
Joined Jun 2012
708 Posts
Quote:
Originally Posted by Stupot46 View Post
Id be tempted to fit some taller fins till the other issues are sorted.
Thank you for the input,
But,
Isn't autopilot enough, for such a large wing, to sort out any instabillity caused by the sort fins?
Or you have something else in mind?

Sakis
sgrouts is online now Find More Posts by sgrouts
RCG Plus Member
Old Feb 23, 2013, 04:38 PM
I don't like your altitude
Stupot46's Avatar
Joined Sep 2011
3,287 Posts
I just thought it might be best to trim the wing as much as possible,get it flying reasonably well,so the a/p can fly it rather than "fight" it.
Stupot46 is offline Find More Posts by Stupot46
Reply With Quote
Old Feb 23, 2013, 07:18 PM
Fighter of Gravity
woolebugr's Avatar
Joined Aug 2007
316 Posts
I had a similar wing years ago with the same problem. I had to cut the trailing edge of the wing and move the motor forward to get it to balance. In my case, I only had to move the motor about a half inch forward. I used a dotted line to illustrate where you may need to cut on your wing.
woolebugr is offline Find More Posts by woolebugr
Reply With Quote
Old Feb 24, 2013, 08:05 AM
I love my HammerHead wing...
sgrouts's Avatar
Joined Jun 2012
708 Posts
Stupo,
got it. Will comply.
Wooleburg, thank you for the advice and the helpfull scetch.
This was my second option to get cg... but....

I MAIDENED IT TODAY!!!

cg is 23cm from the original wing nose. So cg calc was right on.
Of cource I changed the cg by adding that flat lipo container in front of the nose.
But anyway, even with that blunt nose the cg came where the calc was expecting it.
Maybe without the extended nose the cg would settle a few cm in the back.
Thank you all for the help I will post video and images when they are ready.
Have fun, fly safe.

Sakis
sgrouts is online now Find More Posts by sgrouts
RCG Plus Member
Old Feb 24, 2013, 08:24 AM
Registered User
brolley's Avatar
United States, PA, Center Valley
Joined Dec 2008
386 Posts
Sakis-
I was going to say good luck! I see you already maidened. Good job! Glad to see it worked out for you.
Did you do the dive test to finalize CG, maybe you didn't get that far yet. Video would be cool.
Brad
brolley is offline Find More Posts by brolley
Reply With Quote
Old Mar 02, 2013, 01:20 PM
I love my HammerHead wing...
sgrouts's Avatar
Joined Jun 2012
708 Posts
and here are the videos...

http://www.rcgroups.com/forums/showthread.php?t=1843300

Sakis
sgrouts is online now Find More Posts by sgrouts
RCG Plus Member
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Wanted need parts,if you can spair it please help bigfoot3387 Aircraft - Fuel - Helis (FS/W) 5 Feb 17, 2013 01:51 AM
Discussion First Quad, how much weight can I lift? Wrice4 Multirotor Talk 4 Feb 07, 2013 02:22 PM
Discussion How to move CG forward without adding dead weight? Endlesslag Fuel Plane Talk 23 Sep 23, 2012 05:12 PM
Discussion How can I attach images? JWilliams2 Beginner Training Area (Aircraft-Electric) 2 Mar 05, 2007 05:57 AM
Question How can I attach images on threads in RCgroups? SU-4ever Site Suggestions / Complaints 2 May 22, 2006 04:12 PM