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Old Nov 19, 2010, 06:36 PM
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I'll be fine. I'll have a friend launch it for me hehe
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Old Nov 20, 2010, 10:29 PM
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The build begins

Well I made some progress today.

I have made the Go Pro mount, and I am pretty happy with it all. I still have to make a catch mechanism for the front of the canopy to hold it down, but I planned for this and it will be simple.

Yes it is a lot of weight on the front, but a test balance with the wings and tails taped on shows I can balance it with the battery moved all the way back.

I still have to add the diversity receiver, the Eagle Tree OSD and pitot, and the video TX (should be here next week!). Some juggling will be required, but I think it'll be ok. I also plan on lightly glassing the bottom of the fuse to protect again landing damage.

The bottom of the wings are reinforced with carbon fibre tape, and I will also be doing the same for the front of the fuse, since it has all this extra weight now



Those clouds are looking a little closer now...
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Old Nov 21, 2010, 12:38 AM
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UH oh.... I just had some memory of someone saying carbon fibre is very bad for signal reception.... Have I just made a big mistake??!
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Old Nov 21, 2010, 05:07 AM
FPV is my cup of tea
blupp's Avatar
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Quote:
Originally Posted by Gree View Post
UH oh.... I just had some memory of someone saying carbon fibre is very bad for signal reception.... Have I just made a big mistake??!
Carbon eats up RF.
But you haven't used much of the tape.
So try it, I don't think you'll notice any difference.
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Old Nov 21, 2010, 05:36 AM
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Too late I ripped it all off! Wasted it all... Bugger
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Old Nov 21, 2010, 08:14 AM
FPV is my cup of tea
blupp's Avatar
Sweden
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Quote:
Originally Posted by Gree View Post
Too late I ripped it all off! Wasted it all... Bugger
Well, thats good.
I think the most recommended tape is 3M 3650.
But whatever tape is better than no tape, except for aluminum and CF tape.
You could try to protect things like RC-receiver with the CF tape.
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Old Nov 23, 2010, 08:47 PM
Flying FPV from the lab.
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Canada, AB, Lethbridge
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gree, loving the progress, looks great. Really like the motor mount mods and all the strengthening you've done. Cant wait to see how it flies with all your equipment.
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Old Nov 24, 2010, 04:59 AM
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Don't you mean if!?
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Old Nov 24, 2010, 09:11 AM
Flying FPV from the lab.
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of course it will fly! Just a question of how fast your're going to have to go to keep it in the air! And how fast you'll have to bring it in for a landing!
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Old Dec 03, 2010, 03:32 PM
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Well I plan on doing a non-FPV flight test tomorrow with no Eagletree gear in the plane (since the hobbyking order has not turned up yet )

Does anyone know the wing area of this plane (to save me calculating it!). I want to check the wing loading - I'm a bit afraid to!
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Old Dec 03, 2010, 03:39 PM
Flying FPV from the lab.
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It'll go! Nice thing about the skyfun vs. funjet is it doesnt roll much on launch. It has quite a bit of wing area.

I think the skyfun looks like a cross between the space shuttle and an f-14.
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Old Dec 03, 2010, 03:50 PM
NDw
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Doesn't it look beautiful in the sky(skip to about 2.00)?

HobbyKing - SkyFun ARF Pusher Jet (8 min 19 sec)
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Old Dec 03, 2010, 11:16 PM
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Well here is the end result... I am pretty happy with the look and fit of everything.

I am running this 2200kv motor with a 6x5 prop:
http://www.hobbycity.com/hobbyking/s...idProduct=5203

It is pulling 27.48 amps and 287.9 watts at full throttle. How does that sound? For the first few flights I don't want to break the sound barrier...

But I have this 3400kv motor ready to drop in when I get used to things (From the forums, correctly propped it should be good for around 150ish km/h!!):
http://www.hobbycity.com/hobbyking/s...idProduct=8480


Wish me luck. I'm going to give it a non-FPV test fly tomorrow morning with the go pro. :S
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Old Dec 04, 2010, 12:46 AM
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I think it will be sweet, I had a 5000 mah 3s battery in mine and it still launched ok and landed good too. I was using a 9 X 4.5 though with a 1700 kv motor so it was not ultra fast but had good takeoff and vertical power.
Love these planes.

Mark
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Old Dec 04, 2010, 05:37 PM
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Well I am back from the maiden flight. Here's a run down.

Range test with Thomas LRS
Did the usual range test by taking off the TX antenna and walking away until the plane goes into failsafe. I got 18 (big) paces which is pretty damn good! Then I tried it with the Go PRo switched on - 6 paces! LIterally 1/3 the range with the Go Pro turned on, and not even in live video out mode. There was no video tx running or anything either.

I am in major trouble here. Anyone have any ideas?

Launch
I had to swap out my 6x5 prop to the stock Skyfun prop at the field because I noticed some major vibration at full rpm. The prop was way out of balance. So now I have a stock crappy Skyfun prop on, and I did not check the Watts output.

Had my friend launch it 4 times before it got in the air, but admittedly a few of those throws were not very good (sorry James) plus I think I could of flown away from 3 out of the 4 launches but got a bit scared when the roll was a bit crazy immediately after launch and cut the throttle to belly in.

Flight
It flies! Not very fast with that prop and the weight, but it can maintain about a 40 degree climb angle for a fair while. It needed about 7 clicks of right trim and then off it went.

The glide is very good. Glides for a very long time without much loss of altitude, and can land pretty reasonably - about the same as my heavily laden easy star at around 30km/h as an estimate.

I did not have the Go Pro switched on with that massive reduction in range though, so no video.


Issues
I have some work to do if I want to take this on my flying weekend coming up soon. I need to:

- Somehow try to sort the interfere issues with the Go Pro, or simply replace the Go Pro with a normal SD camera

- Work out the best prop motor combo. I have a very hot little motor with a 4.5x4.5 prop waiting (tried and tested on other forums), but I am pretty sure it won't like all the weight.


Way forward?
As I see it I have a couple of choices...

1. Try to find a fix for the camera interference issue, and try a different prop, resulting in a good but slowish plane (Hmm didn't someone try to tell me this thing would be too heavy?)

2. Dedicate this plane to light low flying - minus go pro, long range receiver and OSD, whacking the 150km/h motor on it. Make my easy star the new long range vehicle, and have a spare Eagle Tree OSD for another project...


Votes anyone?
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