|Dec 23, 2012, 03:27 PM|
Successful Speed Session
I just got back from flying with Darren and his buddy George. Darren had a rough day with both of his fast prop jets having tech issues, but he hung out and helped me get some good video of the Nano S.
I flew it 5 times, 3 on 3s and 2 times on 4s. The 4s flights are on Darren`s phone, so he`ll post those when he gets time, but here`s one of the 3s flights. I`ve just checked it with RC Speedo and can only get a reading on a few of the final passes of the flight, when the batts were getting low. Even so, I`m getting 87mph upwind at 2:03 and 113mph downwind at 2:14, for an average of 100mph
If that`s the case, I`m pretty sure that some of the earlier passes would average even higher for the first official sub 40mm edf to break the 100mph barrier. I`ll be pretty happy if that is verified by Doppler. BTW the temp at the time (aprox 1:30 pm in Farmers Branch, Texas) was 63F.
But then I decided to go for broke and try this 6 turn motor on 4s. I wasn`t sure that it would hold up, but I got in two 4s flights and the motor still runs, although the windings are pretty dark.
On the first 4s flight one of the cells seemed to be weak, because it was faster, but not as fast as I had expected. On the final flight of the day, everything came together for some very fast passes, and yes, the motor still runs .
My seat of the pants guess is that it is in the 110mph range, maybe just a little more. It will be interesting to see how the results shake out.
There are still a few things that I can do to clean up the airframe and get a little more speed, and of course it needs an efflux tube. So maybe I can crowd that 120mph mark before it maxes out.
|Dec 23, 2012, 06:27 PM|
4s Flight....Average speed 109mph!!
Thanks Darren for posting the video and doing the Doppler so quickly. It was fun flying with you and George today. Thanks again.
Well everyone, here`s video proof of the first sub 40mm edf to do 100mph+. Darren did Doppler on it and gets 109mph and change for the average of up and down wind speeds. With better lipos and a few more refinements to the airframe, I think I can push it up above 115. Stay tuned!!
|Dec 24, 2012, 09:15 AM|
Thanks Guys! Yep I`m very excited by the results yesterday. This little jet as exceeded my expectations. It`s easy to build, the fan and esc can be easily serviced, and once it`s dialed in, it`s very easy to fly at high speeds.
It`s also a very flexible design. Here is a short list of it`s development stages....
1) First it started as a foam 1oz profile pusher jet on 1s and about 10w. Also flew it on 2s at about 2oz weight and maybe 70w. On 1s it would have been nice indoor performance, on 2s it was great in winds up to about 10mph and had unlimited vertical
2) Then I built a full bodied foam 2s edf with the stock Sky Angle fan/motor/ 6a esc.
3) The above airframe was beefed up and fitted with 3s 360mah 25c lipos and a 12a esc.
This one was clocked ay 79mph
4) This same airframe was pushed to the limit (I think) with a few runs on 4s 360mah cells. The speed increased to about 88mph, but the motor failed after about 4 flights.
5) Then I decided push for 100mph with 4s power, an 18a esc and a rewound motor
capable of over 200w. To fit the power system, I enlarged the airframe slightly and used balsa to build it.
I felt that balsa was needed for it`s extra strength and stiffness. This is the setup that just did 109mph.
I guess the point is that the basic design is very flexible and anyone interested in building one can tailor the building material and power system to match their desired performance level.
|Dec 24, 2012, 03:39 PM|
You've seen the Nspot go fast, so I wanted to get a video of how maneuverable it is. Camera is still too low, but it's better and shows more of the flight envelope. This flight ends in a flat spin. Excuse the French. But the damage was just a few minor cracks in the fuse, 5min repair. When I get a better video I'll post it.
ON the spin.... This airframe, when put into a hard stall with power off, will go into a flat spin. If you have power available, simply go to high power and point the nose down a little and it will quickly recover. The problem was that I hit LVC at the top of a straight vertical climb. I tried to restart the motor, but there wasn`t enough power to recover. Since it hit on an incline with the nose going away from the hill, there was almost no damage. Note to self....set the timer....and go by it.
|Dec 26, 2012, 11:24 AM|
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