Thread Tools
Dec 06, 2014, 03:05 PM
I'd rather be flying.....
JeffMac's Avatar
Thread OP
My Korda Diamond project is winding down so the " tooling up " has begun for the

Berkeley Dick Korda Powerhouse 33 (43) !

Spent considerable time with " urban renewal " of my kitchen counter build area.

Parts patterns were enlarged to fit the 110% plan.

The wing I'm reducing spar cross sections slightly and adding a top spar. I'll make a rib

template tonight.

Two foam building boards will be used to allow two different sections to be built at once.

Spinner will be made following guizo's lead when the time is right.

Best Regards,

Jeff
Last edited by JeffMac; Dec 06, 2014 at 03:10 PM.
Sign up now
to remove ads between posts
Dec 06, 2014, 05:05 PM
I like real wooden aeroplanes!
Sundancer's Avatar
Looking forward to following your progress Jeff.
Dec 06, 2014, 11:49 PM
Registered User
harborflyer's Avatar
WATCHING,

Ross
Dec 07, 2014, 01:36 AM
I'd rather be flying.....
JeffMac's Avatar
Thread OP

stab ribs


stab ribs completed from firm 1/16th sheet balsa.... scale spar size with a 1/16th top spar added. This will be model railroad bass wood or very hard balsa....

Elevator will be on one side only....

Best Regards,

Jeff
Dec 07, 2014, 12:48 PM
Registered User
Paul_BB's Avatar
Good luck!
Dec 07, 2014, 04:29 PM
I'd rather be flying.....
JeffMac's Avatar
Thread OP

vertical


Thanks Paul !

Well, the fin/rudder is built up. Cut from firm 3/32 sheet balsa with some extra wood at the bottom to have some wiggle room when fitting to the stab.

I'll work on the stabilizer tonight.

Best Regards,

Jeff
Dec 07, 2014, 09:14 PM
I'd rather be flying.....
JeffMac's Avatar
Thread OP

stab progress


the stab is on the way......

a strip of carbon fibre sheet is glued between the spar top and rib slots for a couple bays near the center section. another will be added on the bottom of the spar after the stab is otherwise complete.

tips will be shimmed to meet the leading edge then glued into place....

Best Regards,

Jeff
Dec 07, 2014, 09:16 PM
The dog ate my clearance
brokenspar's Avatar
Nice subject, a shapely little beast. Watching with interest!
Dec 08, 2014, 11:21 PM
I'd rather be flying.....
JeffMac's Avatar
Thread OP

stab con'td


A little more progress - the stab is framed up. More spars will be added to allow a large " trim tab " elevator to be separated .....

Rudder / fin just has a double spar to be split as a hinge line....

Best Regards,

Jeff
Dec 08, 2014, 11:30 PM
Registered User
Paul_BB's Avatar
Nice looking stab.

Does the little carbon strip really add some stifness and strengh? It is amazing how thin the strip is. Can you feel the difference when you strain the spar? I don't have any experience with carbon.
Dec 08, 2014, 11:57 PM
I'd rather be flying.....
JeffMac's Avatar
Thread OP

thank you


Quote:
Originally Posted by brokenspar
Nice subject, a shapely little beast. Watching with interest!
Thank you Sir, I'm enjoying this too !

Jeff
Dec 09, 2014, 12:06 AM
I'd rather be flying.....
JeffMac's Avatar
Thread OP

carbon


Quote:
Originally Posted by Paul_BB
Nice looking stab.

Does the little carbon strip really add some stifness and strengh? It is amazing how thin the strip is. Can you feel the difference when you strain the spar? I don't have any experience with carbon.
Hi Paul-

The carbon will be added to the bottom as well.. Yes the strength increase is

incredible but I have never quantified it.

The weight increase is just slight and depends more on the amount of glue used!

The carbon I use is ~ paper thickness.

Thanks,

Best Regards,

Jeff
Dec 09, 2014, 12:34 AM
I like real wooden aeroplanes!
Sundancer's Avatar
Quote:
Originally Posted by Paul_BB
Nice looking stab.

Does the little carbon strip really add some stifness and strengh? It is amazing how thin the strip is. Can you feel the difference when you strain the spar? I don't have any experience with carbon.
Carbon inserts and capping add amazing stiffness to light structures Paul. Modern large and very light built-up structure thermal and electric thermal soarers use this technique extensively, and it can be very useful in building in some strength/stiffness to delicate vintage structures without altering the appearance. The only thing you have to watch (especially when using it for wing spar reinforcement) is the sudden change at the point where the carbon ends, which can create a weak point.
Dec 10, 2014, 12:18 AM
I'd rather be flying.....
JeffMac's Avatar
Thread OP

stab progress


Well the stab is sanded and finished save for the elevator structure... The fin slips between two ribs in the center ... the rudder is ready to be cut loose when ready...

I'm thinking the stab will just glue to the fuse but would rather it were detachable, as long as the method is LIGHT.

Best Regards,

Jeff
Dec 10, 2014, 08:34 AM
I'd rather be flying.....
JeffMac's Avatar
Thread OP

duplicate


duplicate post removed
Last edited by JeffMac; Dec 15, 2014 at 11:40 PM. Reason: duplicate


Quick Reply
Message:

Thread Tools