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Speed,Combat,Scale,Racing => Speed Talk => Topic started by: Jim Kraft on December 24, 2013, 02:35:15 PM

Title: Old Perky speed plane tip weight
Post by: Jim Kraft on December 24, 2013, 02:35:15 PM

Since I have never built a speed plane I thought I would ask you guys that know. I am finishing up a Black Hawk Perky and no where on the plans does it call for tip weight. Is that normal for speed planes? Should I add some? Thanks for any reply's as I have only built and flown stunt and one combat plane.

Title: Re: Old Perky speed plane tip weight
Post by: Paul Smith on December 26, 2013, 02:38:28 PM

The Perky has a very short wingspan, only 18".  So the outboard tip is only 9" outboard.  So you need A LOT more tip weight than a big stunter with a long wing.  I would put in a full ounce for starters and be perpared to remove some of possible.  If you start out light you  won't have a second chance.

Title: Re: Old Perky speed plane tip weight
Post by: Jim Kraft on December 26, 2013, 08:26:09 PM

Thanks Paul; I will try an ounce to start with. I don't have a clue why there is no mention on the plans anywhere for tip weight. Thanks again.

Title: Re: Old Perky speed plane tip weight
Post by: Paul Smith on December 27, 2013, 02:03:38 PM

Perky speed leaves a lot to the imagination.

Remember, in the olden days there was a lot more clockwise flying, so torque was your friend.
Also, they didn't need or use the heavy lines we require today.
If you use a modern engine it will have lot more torque than Kania had.

Title: Re: Old Perky speed plane tip weight
Post by: john e. holliday on December 28, 2013, 09:17:18 AM

Just remember to really lead the plane on take off like the better racing pilots do.  I have one ready to go as soon as I put the needle valve back in when I can find it.

Title: Re: Old Perky speed plane tip weight
Post by: rustler on December 28, 2013, 01:26:14 PM

Quote from: john e. holliday on December 28, 2013, 09:17:18 AM

  I have one ready to go as soon as I put the needle valve back in when I can find it.

I can relate to that!!!! :(

I fly my Perky anticlockwise (conventional) on U-Reely with 18thou stranded lines. It has maybe 1/2oz. tip weight and takes off and handles the English wind quite o.k. A pleasant little model.

Title: Re: Old Perky speed plane tip weight
Post by: Jim Kraft on December 28, 2013, 05:36:03 PM

Thanks for the replys guys. This one will have a Fox 15X slant plug in it, and if that does not work I also have a Fox 15 steel fin to go in it.