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Old Dec 04, 2012, 09:08 PM
wheeeeee!
elCapitan's Avatar
United States, UT, Provo
Joined Oct 2011
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Why? What's happening?
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Old Dec 04, 2012, 11:15 PM
Registered User
Canada, BC, Vancouver
Joined Feb 2012
637 Posts
Ya whats up, it was my first wing/plane, i had er airborne first toss..... For like 3 seconds lol
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Old Dec 05, 2012, 09:17 AM
Bay Area Prop Buster
Bluhammer's Avatar
Bay Area CA
Joined Jan 2011
3,796 Posts
I was frustrated too. Kept dorking it in until I launched it near full throttle and finally got her up and was disappointed in its speed. Weeks later after changing motor and ESC, I discovered I was running with the prop reversed!
She flies awesome now and takes off fine with a little over half throttle. I love the Assassin!
Blu
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Old Dec 05, 2012, 12:31 PM
Lee
PERFECT LANDING !!!
Lee's Avatar
USA, UT, Orem
Joined Jul 2004
8,622 Posts
Take a look at our preflight checklist.

http://crashtesthobby.com/articles/10-mistakes-to-avoid

I help a lot of newer local flyers trim in planes. Most of the time they are having trouble it is not just one but a combination of these things.

1. Their CG is too far back. Flying wings won't fly tail heavy... ever. (add some weight to the nose and try the plane with the CG forward)
2. They have too much movement it the elevons. (This shows up as a snap roll on take off)
3. They have poor leverage from the servo arm to the elevon horn. (This is usually a higher speed problem and the plane won't pull out of a dive.)
4. They don't know how to launch the plane. (Don't spin it at all when you launch.)
5. They have a plane above their skill level.
6. They are flying with their thumbs and not grasping the stick with thumb and finger. Some planes are so responsive you need two points of reference to have full control.
7. I have had several flyers that couldn't fly with the expo on. I recommend turning Expo off.
8. .... and an occasional prop on backwards. I did this myself this year!!! (writing on the prop should face forward)


Lee



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Last edited by Lee; Dec 05, 2012 at 01:04 PM.
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Old Dec 05, 2012, 03:11 PM
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United States, MD, Kensington
Joined Dec 2008
279 Posts
So 3/8" travel (on an Assassin) should be enough? The stupid little Pop Wings are totally outmaneuvering me at the field, so I'm thinking of adding a little more travel.
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Old Dec 05, 2012, 03:25 PM
wheeeeee!
elCapitan's Avatar
United States, UT, Provo
Joined Oct 2011
904 Posts
3/8" up and 3/8" down.

If that's not floating your boat, you can certainly dial it up, but if you have DR or expo on, I'd personally dial that down to nothing first. Then if you still want more, program in more travel, bit by bit.

For me, CTH's recommended travel has been enough on every plane but the Albatross. I programmed in some more on that one, and also fly with a 3530 1800kv motor, instead of a 2812.
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Old Dec 05, 2012, 05:08 PM
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Joined Oct 2012
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I don't know what's wrong with it My only other plane was a big nitro trainer. I didn't have to launch.

My movements are correct. No binding in the servos. Elevon travel is set. Maybe the CG is screwed up I'm using a big motor to offset the 2200 up front.

My attempts at flying usually go something like this. Grasp wing in right hand, throttle up until I can feel the wing pushing. Try my best to "set it on the air" with out throwing it. Quickly move right hand to transmitter, and about that time the planes already bouncing off the ground. I tried giving it more throttle on launch but that just put it in the ground even quicker.
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Old Dec 05, 2012, 05:11 PM
Planes in flames,,,
jetpackninja's Avatar
Gravity Sucks
Joined Aug 2010
3,312 Posts
Where is your CG? (how far back from the nose)
How much reflex do you have in the elevons?
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Old Dec 05, 2012, 05:28 PM
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Canada, BC, Vancouver
Joined Feb 2012
637 Posts
My plane balances nice with the 2200 3s up front and the motor recommended on the site, battery is starting exactly 2.5 inches back from nose, cog is 6 3/8 from nose... Check you motor mount too. I had crashed a few times and it bent forward.. Was a pain to get any climb it was as if my elevator was always staling
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Old Dec 05, 2012, 06:06 PM
RC,ROBOTICS,LASERS
n-2-stuff's Avatar
Clovis,Ca.
Joined Sep 2006
386 Posts
Quote:
Originally Posted by Thursday View Post
I don't know what's wrong with it My only other plane was a big nitro trainer. I didn't have to launch.

My movements are correct. No binding in the servos. Elevon travel is set. Maybe the CG is screwed up I'm using a big motor to offset the 2200 up front.

My attempts at flying usually go something like this. Grasp wing in right hand, throttle up until I can feel the wing pushing. Try my best to "set it on the air" with out throwing it. Quickly move right hand to transmitter, and about that time the planes already bouncing off the ground. I tried giving it more throttle on launch but that just put it in the ground even quicker.
Do you have some up trim. My buddys and I have 3 assassins and beat the hell out of them in combat. They all still fly like new. Lee has a awesome product. In fact we just got a 3 pack of widowmakers.We are going to make speed wings out of them.
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Old Dec 05, 2012, 06:30 PM
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Joined Oct 2012
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Quote:
Originally Posted by jetpackninja View Post
Where is your CG? (how far back from the nose)
How much reflex do you have in the elevons?
Well I was aiming for 6.5" but the push pin method seems a little wonky to me to really be able to tell.

I don't know what you mean by reflex.

I'm regretting the way I setup my motor by the way. Is there anywhere you can buy just a new 3mm shaft or whatever size it is to fit this motor?

Quote:
Originally Posted by elliott000 View Post
My plane balances nice with the 2200 3s up front and the motor recommended on the site, battery is starting exactly 2.5 inches back from nose, cog is 6 3/8 from nose... Check you motor mount too. I had crashed a few times and it bent forward.. Was a pain to get any climb it was as if my elevator was always staling
My battery starts exactly 2" from the nose. Though I suppose we could have different weighted batteries, and my motor seems a lot bigger than yours. My motor mount is 90 degrees.



Quote:
Originally Posted by n-2-stuff View Post
Do you have some up trim. My buddys and I have 3 assassins and beat the hell out of them in combat. They all still fly like new. Lee has a awesome product. In fact we just got a 3 pack of widowmakers.We are going to make speed wings out of them.
I don't have any up trim I set the wing on the table, 90'd the servos and pushed the elevon down to match the bottom plane of the wing then tightened up the push rod.

I feel like I've already beat the hell out of mine just trying to get it to fly. I hate seeing it nose dive in the ground so many times.
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Old Dec 05, 2012, 06:43 PM
wheeeeee!
elCapitan's Avatar
United States, UT, Provo
Joined Oct 2011
904 Posts
Quote:
Originally Posted by Thursday View Post
Well I was aiming for 6.5" but the push pin method seems a little wonky to me to really be able to tell.
It's pretty difficult to get the plane to actually balance on the pins, but you should be able to find the spot at which it wobbles either way, depending on how you hold it. So, where exactly does your plane balance?

Quote:
Originally Posted by Thursday View Post
I don't know what you mean by reflex.
the amount of "up" that's programmed into the elevons when you're not touching the sticks. the elevons "at rest" should be angled just slightly higher than the angle of the surface of the wing, as if it's pulling up slightly.

Quote:
Originally Posted by Thursday View Post
I don't have any up trim I set the wing on the table, 90'd the servos and pushed the elevon down to match the bottom plane of the wing then tightened up the push rod.
And thus, this might be one big problem.

Quote:
Originally Posted by Thursday View Post
I'm regretting the way I setup my motor by the way. Is there anywhere you can buy just a new 3mm shaft or whatever size it is to fit this motor?
Why, what's different about it? What don't you like?

And one last thing--I looked at your picture and noticed you don't have any winglets on the wing tips. Those chloroplast pieces that came with the kit should be attached on the wing tips to keep the wing from wagging back and forth. Some people like to leave them off, but then you have to cut a flat-faced diagonal from the leading edge of the wing tips, to produce the same effect. The chloroplast works a lot better, though.

Without any winglets to stabilize the wing, plus no reflex (or up-trim) in the elevons, that's probably enough to make it un-flyable.
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Old Dec 05, 2012, 06:51 PM
Bay Area Prop Buster
Bluhammer's Avatar
Bay Area CA
Joined Jan 2011
3,796 Posts
Lack of reflex is definitely one of your major problems!
Blu
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Old Dec 05, 2012, 06:57 PM
Registered User
Joined Oct 2012
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Quote:
Originally Posted by Bluhammer View Post
Lack of reflex is definitely one of your major problems!
Blu
Well what is it?
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Old Dec 05, 2012, 07:01 PM
BUZZ KILL
Plane Insane RC's Avatar
Utah
Joined Aug 2010
1,006 Posts
Quote:
Originally Posted by Thursday View Post
Well what is it?
elCapitan answered this question but here it is again.

the amount of "up" that's programmed into the elevons when you're not touching the sticks. the elevons "at rest" should be angled just slightly higher than the angle of the surface of the wing, as if it's pulling up slightly.
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