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General control line discussion => Open Forum => Topic started by: John KruziK on December 11, 2010, 09:21:00 PM

Title: Brodack P 40
Post by: John KruziK on December 11, 2010, 09:21:00 PM

Do both the ARF and kit have have built up elevators . Thanks John

Title: Re: Brodack P 40
Post by: Clint Ormosen on December 11, 2010, 09:34:31 PM

I believe so.

Title: Re: Brodack P 40
Post by: Glenn (Gravitywell) Reach on December 12, 2010, 10:29:22 AM

My kit had built-up....that's half the answer.  Anyone have an ARF? H^^

Title: Re: Brodack P 40
Post by: Dick Pacini on December 12, 2010, 04:53:28 PM

My ARF has built up.

Title: Re: Brodack P 40
Post by: FLOYD CARTER on December 12, 2010, 04:57:39 PM

The Brodak P-40 ARF has built up and balsa-covered tail pieces.  They are very heavy. Pat Johnson (the designer) recommended replacing the tail with lighter pieces.  Also, his own P-40 has a bit of wing dihedral, which he recommends for better flying.  These changes wouldn't be very difficult if you started with the ARC, or stripped the film from the ARF, and refinish in silkspan and Brodak paints, like I did.

Floyd

Title: Re: Brodack P 40
Post by: Mark Scarborough on December 12, 2010, 06:39:14 PM

I have had several P-40s, a couple ARFs and one ARC. The horizantal tail and elevator ranged from IIRC 4.5 ounces on one, to 3 ounces on another. I built new ones that were right at two ounces, it makes a big difference on this plane. By the way, it is a great flying airplane.

If you are doing an ARC or ARF, heres a short tutorial on how to add dihedral

http://stunthanger.com/smf/index.php?topic=4931.0

its a very simple process, and it DOES make a difference in the way the plane flies.

Title: Re: Brodack P 40
Post by: john e. holliday on December 12, 2010, 07:47:09 PM

Thanks,  now to get it printed off so I can put it with my ARF kit.   H^^

Title: Re: Brodack P 40
Post by: Pat Johnston on December 13, 2010, 07:02:20 AM

Doc,
Good to see you.  Mark, my buddy, is right on about the dihedral.  Install somewhere in the 1/2" to 5/8" dihedral and the plane will hang out perfectly on the lines, assuming a perfectly straight wing.  This is a spectacular flying plane and you will love it.  It can stand toe-to-toe with any other profile around.  Mark's electric version flew very well even at the upper 50 ounce weight range.  Most P-40's fly around 45-48 ounces.  We run an LA46 with the stock muffler to get the CG to cooperate if the heavy tail is used.  I installed an LA25 venturi and ST NVA on my LA46 last month and it swung an 11.5 X 4W APC very well and used 2 1/2 ounces of fuel for the pattern with a perfect stunt run.  How's them apples?
Pat Johnston
Winter in Idaho
Skunk Works