Align AH-1W Super Cobra build.. - Page 7

DWSchmidt · 08-31-2012, 10:14 PM

Rob,

In the pictures, are those 473mm blades on the Cobra or 425 blades? I realize they're display only, just trying to judge the length.

Thanks!

D.W.

Rob43 · 09-02-2012, 03:02 PM

In the pics with the 7HV, the Cobra blades are Spin 465mm asymmetricals. Not for display, but for flight. They fly very nicely at a reasonable headspeed. 75% throttle with a 12t pinion does fine. From a 4 minute sortie, the Thor 45C2700 pack comes down at 3.85 volts per cell, and just beginning to get warm.

My display blades (shown below) are much wider and have opposite rotation sense. They also feature a trapezoidal tip as designed by Boeing for Bell. These are from Sig Mfg balsa 3" flat bottom airfoil. The root laminatiions were made from 10 mil thick vinyl. A drag link ws added for a final touch to anchor the blade to the head since this is how Bell designed for setting lead/lag of the blades.

bladerunner469 · 09-02-2012, 05:17 PM

SWEET

ozflyer · 09-03-2012, 04:09 AM

Rob

Do you know how much you put back into the batteries for a 4 min flight.
With the Edge 473's I put back around 1400 mAhs for a 4 min flight with a similar setup.

1275mini · 09-04-2012, 04:07 PM

just got one ! and i need a set of pilots any ideas lads !!!!

Rob43 · 09-06-2012, 08:54 AM

Quote:

Originally Posted by ozflyer

Rob

Do you know how much you put back into the batteries for a 4 min flight.
With the Edge 473's I put back around 1400 mAhs for a 4 min flight with a similar setup.

Sorry, Steve, but I didn't take note. I bet it's around the same value as your case though. Maybe less. I recall that at 4 mins, I am at 3.85v/cell with the 6S2700 pack. I think 5:30 to 6 mins could be achieved with my pack at 75% throttle.

Rob43 · 09-06-2012, 08:58 AM

Quote:

Originally Posted by 1275mini

just got one ! and i need a set of pilots any ideas lads !!!!

Check with user "Hoverup" for the McFarland heli pilots that I used. If he has them, they won't be cheap! He might also know where else they could be found. Best wishes!

BakedMopar · 09-28-2012, 02:30 AM

Any vids of this Rob?

ozflyer · 09-28-2012, 02:56 AM

If you have a look on the AH-1W group there is a lot of pics of Robs build and a video of mine flying

http://www.helifreak.com/group.php?groupid=338

Rob43 · 10-02-2012, 08:44 AM

No vids. No one around me shoots anything. I can't even get decent still shots on anything. It sux! I am confident the vid would showcase it well. If flies like a dream, and moves along very realistically. Much better than I expected.

09-02-2012, 03:02 PM	#122
Rob43 Registered Users Thread Starter Join Date: Oct 2008 Location: Midland, MI - USA	In the pics with the 7HV, the Cobra blades are Spin 465mm asymmetricals. Not for display, but for flight. They fly very nicely at a reasonable headspeed. 75% throttle with a 12t pinion does fine. From a 4 minute sortie, the Thor 45C2700 pack comes down at 3.85 volts per cell, and just beginning to get warm. My display blades (shown below) are much wider and have opposite rotation sense. They also feature a trapezoidal tip as designed by Boeing for Bell. These are from Sig Mfg balsa 3" flat bottom airfoil. The root laminatiions were made from 10 mil thick vinyl. A drag link ws added for a final touch to anchor the blade to the head since this is how Bell designed for setting lead/lag of the blades. __________________ = R To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. b43 = Team Compass Support

09-02-2012, 05:17 PM	#123
bladerunner469 Registered Users Join Date: Nov 2009 Location: Orlando Florida	SWEET __________________ Bring it home in one piece To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

09-04-2012, 04:07 PM	#125
1275mini Registered Users My HF Map location Join Date: Nov 2004 Location: Wirral North West U.K.	just got one ! and i need a set of pilots any ideas lads !!!! __________________ Barry

10-02-2012, 08:44 AM	#130
Rob43 Registered Users Thread Starter Join Date: Oct 2008 Location: Midland, MI - USA	No vids. No one around me shoots anything. I can't even get decent still shots on anything. It sux! I am confident the vid would showcase it well. If flies like a dream, and moves along very realistically. Much better than I expected. __________________ = R To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. b43 = Team Compass Support

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08-31-2012, 10:14 PM	#121
DWSchmidt Registered Users Join Date: Jun 2008 Location: Altus AFB, OK	Rob, In the pictures, are those 473mm blades on the Cobra or 425 blades? I realize they're display only, just trying to judge the length. Thanks! D.W.

09-03-2012, 04:09 AM	#124
ozflyer Registered Users Join Date: Dec 2010 Location: Brisbane, Australia	Rob Do you know how much you put back into the batteries for a 4 min flight. With the Edge 473's I put back around 1400 mAhs for a 4 min flight with a similar setup.

09-28-2012, 02:30 AM	#128
BakedMopar Registered Users Join Date: Sep 2010 Location: Hilo,HI	Any vids of this Rob?

09-28-2012, 02:56 AM	#129
ozflyer Registered Users Join Date: Dec 2010 Location: Brisbane, Australia	If you have a look on the AH-1W group there is a lot of pics of Robs build and a video of mine flying http://www.helifreak.com/group.php?groupid=338