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-   -   XP-1 (https://www.wattflyer.com/forums/showthread.php?t=74348)

abborgogna 08-22-2014 06:00 PM

3 Attachment(s)
Took out my latest design to the field this morning and test flew it for the first time. I am very pleased to say that the maiden flight went very well. My friend Mark hand launched it into the wind and except for some down trim to get the nose where I wanted it there was no other issues. I am going to try to post a picture of the top and bottom of the plane. You will notice tip weight on the wing opposite to the wing that has the battery mount. The battery counter weight worked as designed giving the wing excellent roll stability.

To insure the CG being near the correct location I did three different methods to locate it. First I made a 1/2 scale glider version kept adjusting the CG until if flew correctly, then I used two different programs to compute the CG. To my surprise all three came within a 1/4" of each other and other than some down trim the plane flew very stable. I just need to make a minor adjustment to the elevator trim and it's ready for more testing.

Rockin Robbins 08-23-2014 04:30 PM

Looks nice, cheap to build, cheap to repair, fun to fly. I like it!

abborgogna 08-23-2014 08:00 PM

You are correct on all three counts.

Don Sims 08-23-2014 08:19 PM

That is a cool looking foamie. Glad the maiden went well.

abborgogna 08-23-2014 08:28 PM

One thing I have learned with Depron foam planes is they have a finite life time. Over time stress crack form and the repairs add weight until you get to where the plane is not fun anymore. BUT, they are cheap to build, they are easy to build, they are easy to design and they are a bunch of fun to play with. I think it's a fair trade.

By the way XP-1 comes from Experimental Plane number 1. Designing my own planes is fun to me and lately with my discovery of Depron I have been having fun coming up with new designs.

abborgogna 08-25-2014 06:44 PM

Put a couple more flights on the XP-1 this morning and it only gets better. I asked one of the guys at the field to toss it up for a launch. He gave the plane a very soft toss, but instead of stalling and falling it just gently flew away. I also started to see what the plane is capable of doing. I did an inside loop, roll right and roll left and did another stall test. All went well, the XP-1 shows no tendency to tip stall, it just drops it nose and pulls out when power is applied.

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