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Building Tips and technical articles. => Building techniques => Topic started by: Joe Rice on March 06, 2021, 11:03:43 AM

Title: Cardinal ARC Fuselage Openings, Etc
Post by: Joe Rice on March 06, 2021, 11:03:43 AM

I dusted off a Cardinal ARC project that was shelved for a few years.  I had installed Tom Morris controls and it is set up for a OS LA 46 prepped by Randy.  I had planned to cover the fuse with Polyspan aft of the wing, but was wondering if diagonal cross bracing in the cutouts would be beneficial.

I also have a Cardinal kit well underway and would like to use my Aero Tiger 36.  I am guessing this would be a good match?

Thanks,

Joe

Title: Re: Cardinal ARC Fuselage Openings, Etc
Post by: Ken Culbertson on March 07, 2021, 12:44:28 AM

Quote from: Joe Rice on March 06, 2021, 11:03:43 AM

I dusted off a Cardinal ARC project that was shelved for a few years.  I had installed Tom Morris controls and it is set up for a OS LA 46 prepped by Randy.  I had planned to cover the fuse with Polyspan aft of the wing, but was wondering if diagonal cross bracing in the cutouts would be beneficial.

I also have a Cardinal kit well underway and would like to use my Aero Tiger 36.  I am guessing this would be a good match?

Thanks,

Joe

Tail wiggle is a curse and I have not seen a Cardinal that didn't have some tail weight added.  Not only would I put in "V" braces, I would sheet it with 1/64 plywood or 1/32 balsa.  Too late for CF tubes...maybe not.

Ken

Title: Re: Cardinal ARC Fuselage Openings, Etc
Post by: Dennis Moritz on March 08, 2021, 12:21:14 AM

Far as I can tell the Cardinal ARC Fues is not balsa. Some kind of sappy hardwood. Sheeting could help. Even 1/16" balsa. The ones I've seen don't seem tail heavy. Yep. Swap out the controls. Good idea. I'd use carbon tube pushrods. It's a long way to the elevator horn.

Title: Re: Cardinal ARC Fuselage Openings, Etc
Post by: Air Ministry . on March 09, 2021, 09:24:49 PM

Could inlay 1/16th sht. ea. side. grain voiticle .

Title: Re: Cardinal ARC Fuselage Openings, Etc
Post by: Serge_Krauss on March 11, 2021, 08:03:06 PM

Diagonals (balsa) and sheeting will stiffen it more than filling with balsa; the grain direction countering torque loads is the key. Completing by sheeting over with balsa, rather than plastic covering that they use,
 is MUCH stiffer. - SK

Title: Re: Cardinal ARC Fuselage Openings, Etc
Post by: Crist Rigotti on March 11, 2021, 08:58:31 PM

Quote from: Serge_Krauss on March 11, 2021, 08:03:06 PM

Diagonals (balsa) and sheeting will stiffen it more than filling with balsa; the grain direction countering torque loads is the key. Completing by sheeting over with balsa, rather than plastic covering that they use,
 is MUCH stiffer. - SK

Ditto!

Title: Re: Cardinal ARC Fuselage Openings, Etc
Post by: Joe Rice on March 12, 2021, 05:20:50 AM

I appreciate all of your ideas for stiffening the Cardinal ARC fuselage.  I will go with the diagonal bracing in the openings and balsa sheeting on a bias.  Good stuff...thanks  :)

Joe