RE: Extra 300 Prototype #2  
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RE: Extra 300 Prototype #2 - 1/24/2007 4:25:42 AM   
DMichael


 

Posts: 763
Joined: 11/1/2002
From: Laurel, MD, USA
Status: offline 		This is a Velox- but I dig the purple and red together.

Dave



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       Post #: 101

RE: Extra 300 Prototype #2 - 1/25/2007 10:27:25 PM   
RobT



Posts: 674
Joined: 9/29/2003
From: Whitestone, NY, USA
Status: offline 		Dave,

The Geico scheme was one of my first thoughts . . . my wife (who is more of an artist than I will every be) thought it could be better...

It is very cool you know the guy though...so why haven't you done his scheme since you have easy access to the documentation?

Rob

(in reply to DMichael)
       Post #: 102

RE: Extra 300 Prototype #2 - 1/26/2007 3:22:03 AM   
RickP



Posts: 1679
Joined: 1/1/2002
From: Levittown, NY, USA
Status: offline
quote:

ORIGINAL: as722

I'll post a picture of a jig I made.

Albert



Cool,
I'll standby for the pic
Rick

(in reply to as722)
       Post #: 103

RE: Extra 300 Prototype #2 - 2/4/2007 12:28:12 PM   
RobT



Posts: 674
Joined: 9/29/2003
From: Whitestone, NY, USA
Status: offline 		I do the cowl the way Brian Hueffmeier taught me.

The "J" brackets and the top "U" brackets get mounted first, flush against the fuse sides. (sand as necessary to recess them the thinkness of the cowl in from the sides)

On the top of the "J" bracket drill a 1/4" whole and place a dowel in the hole to prevent the bracket from moving side to side. (on this cowl I left 1/4" of dowel stickin out of the fuse, in hind site i should have left more so it does not slide of as easily when working on the instillation)

Tape the bottom of the cowl in place with wax paper seperating the fuse and brackets (Brian actually puts a small screw through the cowl and "J" bracket to hold it in place) and tack glue the cowl to the brackets. Repeat for the top (sand the joint between the cowl halfs if necessary for a snug fit. (for the bottom I used zap and for the top I used 5 minute)

Once this is dry remove and goop the brackets to the cowl.

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(in reply to RickP)
       Post #: 104

RE: Extra 300 Prototype #2 - 2/4/2007 12:38:24 PM   
RobT



Posts: 674
Joined: 9/29/2003
From: Whitestone, NY, USA
Status: offline 		Another picture of bottom, doing the top of the cowl and a shot of how it looks so far.

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       Post #: 105

RE: Extra 300 Prototype #2 - 2/4/2007 12:40:54 PM   
RobT



Posts: 674
Joined: 9/29/2003
From: Whitestone, NY, USA
Status: offline 		...and then goop

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       Post #: 106

RE: Extra 300 Prototype #2 - 2/4/2007 3:15:48 PM   
BBW Walt



Posts: 929
Joined: 1/13/2002
From: NWest, IN, USA
Status: offline 		Hey Rob, Whats the advantage of flush mounting the cowl mounts? I have entertained the idea but I like the idea of a glue fillet on both sides of the top strap and J rounds so I haven't tried this method. The build looks great, Walt

(in reply to RobT)
       Post #: 107

RE: Extra 300 Prototype #2 - 2/4/2007 10:41:56 PM   
RobT



Posts: 674
Joined: 9/29/2003
From: Whitestone, NY, USA
Status: offline 		Since you are pulling the top strap up against F1 with the 6-32 bolts, the whole cowl is braced against the fuse. You can literally pick the entire airplane up by the cowl (Brian actually did that on his plane when I asked him a similar question to prove his point!)

And have you ever tried to take goop off? I have (mushed cowl from a trying to torque roll without gas...) and I can tell you a filet on one side is plenty!

Rob

(in reply to BBW Walt)
       Post #: 108

RE: Extra 300 Prototype #2 - 2/4/2007 10:55:03 PM   
RobT



Posts: 674
Joined: 9/29/2003
From: Whitestone, NY, USA
Status: offline 		Walt,

I did not realize it was you until I opened the link under your signature! Thank you for stopping by! I appreciate your kind words about the build, however quite honestly I am humbled by your build and have posted less than I thought I would since you and Albert have covered most things . . . . from here on-out I will only post things I do differently than you guys, and my final (after 1st flight) pictures.

Thanks for your build!

Rob

(in reply to BBW Walt)
       Post #: 109

RE: Extra 300 Prototype #2 - 2/5/2007 9:53:51 PM   
RobT



Posts: 674
Joined: 9/29/2003
From: Whitestone, NY, USA
Status: offline 		Gooped Carden's new duct to the bottom of the cowl...

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       Post #: 110

RE: Extra 300 Prototype #2 - 2/6/2007 1:08:42 AM   
RobT



Posts: 674
Joined: 9/29/2003
From: Whitestone, NY, USA
Status: offline 		After a long talk with Dennis I decided to do a One piece cowl. So at this point I washed the cowl to remove any relase agent, sanded the matting surfaces and brushed laminating epoxy to the mating sides of the cowl, and taped the whole thing togehter to dry.

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       Post #: 111

RE: Extra 300 Prototype #2 - 2/16/2007 1:14:58 AM   
gbrod


 

Posts: 69
Joined: 2/18/2003
From: bay harbor, FL, USA
Status: offline 		Hi,
Thanks for the great thread.
As per the Carden plans, the elevators are held in place by the elevator tube and a "L" bracket attached to the fuse.
I saw some threads in RCUniverse suggesting that the L bracket may fail easily.
A simple fix would be to add a 1/4" anti-rotation dowell in the elevator as an added "safety". Do you think its worth the trouble or am I overreacting?
Thanks
George

(in reply to RobT)
       Post #: 112

RE: Extra 300 Prototype #2 - 2/16/2007 5:12:49 PM   
RobT



Posts: 674
Joined: 9/29/2003
From: Whitestone, NY, USA
Status: offline 		George,

Thank you for the kind words.

I believe the failures are caused by faulty installations. If the L brackets are being twisted in any way when you screw down the stabs, then yes they will eventually fail.

That being said, I put a 1/4" dowel in my stabs on this one. I have not done this on any carden's before and never had issues.

(in reply to gbrod)
       Post #: 113

RE: Extra 300 Prototype #2 - 3/2/2007 1:19:31 AM