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donjiskra
08-15-2006, 02:38 AM
Here's a link to the video.
Shows that the SK400XT motor works with a 24 ounce float plane.

http://www.youtube.com/watch?v=5Rnr1XSqbVI

Hope you like it?
Don

Eric_N57105
08-15-2006, 07:12 AM
Here's a link to the video.
Shows that the SK400XT motor works with a 24 ounce float plane.

http://www.youtube.com/watch?v=5Rnr1XSqbVI

Hope you like it?
Don

Looked pretty good, Don. Seemed like a long take off run, but I haven't seen many RC float planes to compare it to. Also, it's difficult to tell perspective on video.

In the air, it seemed to have a pretty fast sink rate. A lot of drag from the floats for this little airplane. The porpoising might be something you are addressing with the new battery placement. Minor problem. Squirrely little thing, but fine tuning and experience with type will probably correct that.

The 400XT did a good job. It probably flies fairly scale with that motor. I don't think the real thing would loop with floats either!

I'm not so sure I could get away with a 400XT with a 2-blade prop. Based on your experiences, I think I'll go for a little more kv, maybe 1500-1800 with a 6x4 would give it a little more oomph.

I'm still working on the motor mount. The original owner glued the two halves of the nacelle together so it was hard working inside it. A couple of days ago, I got brave and cut the two apart so I can mount the bottom half on the wing, and get the motor mounting sorted out. Then I'll just have a blind nut on the motor mount so I can screw the top nacelle piece in place.

I got sidetracked, though. I'm building Jim Spencer's kit to make the Slow Stick into a seaplane. It's an ungainly bird compared to beauty of the Sky Arrow, but I'm hoping it will be a suitable seaplane trainer to give me some water experience first.

http://www.rcgroups.com/forums/showthread.php?t=509400

Congrats on the great flight and very instructive video. It's a privilege to follow in your wake getting my Sky Arrow set up.

Eric
www.ke6us.com

donjiskra
08-15-2006, 12:34 PM
Thanks for your comments.
Yes we used a longer take-off run, to slowly build up take off speed with less up elevator, in order to avoid the tip-stalls that we encountered the last three times, with too much power and too much up elevator setting.
It was beautiful to see it rise gradually instead of flipping over, that's why Jim was so estatic.

I have reduced the aileron throws 50% and will shift the battery full forward, to eliminate "Sky Squirrel", (loved that appellation, you gave it).

Your right about the drag, sink rate, scale like speed and looping.
The flight proved many things, fine tuning certainly is in order.

The SK400 surprised me and I'm very happy with it's power. I wouldn't want more, as it flies along nicely at slightly more than 1/2 throttle
The Varioprop worked very well.
http://www.e-flightline.com/varioprop.htm

Good luck with yours,
Don

Eric_N57105
08-16-2006, 05:02 AM
Thanks for your comments.
Yes we used a longer take-off run, to slowly build up take off speed with less up elevator, in order to avoid the tip-stalls that we encountered the last three times, with too much power and too much up elevator setting.
It was beautiful to see it rise gradually instead of flipping over, that's why Jim was so estatic.

I have reduced the aileron throws 50% and will shift the battery full forward, to eliminate "Sky Squirrel", (loved that appellation, you gave it).

Your right about the drag, sink rate, scale like speed and looping.
The flight proved many things, fine tuning certainly is in order.

The SK400 surprised me and I'm very happy with it's power. I wouldn't want more, as it flies along nicely at slightly more than 1/2 throttle
The Varioprop worked very well.
http://www.e-flightline.com/varioprop.htm

Good luck with yours,
Don

Thanks, Don. I'm getting anxious to get it airborne. It's going to be land-based first since I have no seaplane experience. I'll post the results in this threat anyway since once it flies well and I gain experience with the Slow Stick seaplane, I'll put the Sky Arrow on floats.

Congrats again on the flight.

Eric
www.ke6us.com

donjiskra
08-16-2006, 12:54 PM
Good idea Eric. Look forward to hearing about your land flight and compare it to the drag factor of mine with floats, with it weighing in at 21 ounces it will have less sink rate.
Good luck!
don