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6.5" back from the tip of the nose, Sculptor.
http://crashtesthobby.com/products/assassin -Mike Sorry elliot, didn't see your post. |
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Well as I wrote last week I've been very unhappy with the stock performance of my Assassin.
I then discovered I had been flying with the prop reversed, but only after I had replaced the stock motor for one recommended by the guys at HeadsupRc. So today I flew her with the new motor, a Powerup 370 Zoom with a 6x4E APC prop installed correctly. WOW, OH BABY! This puppy is fast and flies awesome . She's now way faster then my friends properly setup stock Assassin, and light years better then my original reversed prop screw up. Unlimited vertical and screams at full throttle and I still get 6 minutes of mixed flying! Love it! Blu |
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That aileron point is well taken. Before I got my Assassin straightened out I tried increasing the throws and found right away that it would badly stall on hard turns. With them back to recommended she turns on rails. This is now one of my favorite planes and is bringing me much joy!
Blu |
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Assassin ready for the maiden flight
Well, My Assassin is ready for its maiden flight.
18.5 oz Ready to fly CG is at 6.5" from the nose C3530 1700 KV Motor HW 30A ESC MG90 Servos Nano Tech 1300 25-30C Batt Winglets are installed since the weight came out a little high. I moved the motor mount forward to attempt to balance with the 1300 battery. Dual rates dialed down to 50% to get to only 3/8" movement. This is the first wing I have built in over 10 years. We will see how it goes.... |
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Blu |
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With a 7x6 on a 3530-1700kv you will be at the limit of both the ESC and could possibly puff the battery. I was test flying a similar set up a couple of weeks ago and when it was wide open throttle the elevons would stall with only the MG90 servos. I came around the back side of a loop going for a speed run for the Doppler and it wouldn't pull out with the MG90s. I hit a plowed field at 80+ mph. Plane was fine. It did leave a huge divot in the field. If you are using the travel adjustment on the transmitter to turn the throws down you are not maximizing leverage. The control rods should be close to the center of the servo arm and at the tip of the horn on the elevon. The Assassin in question was not set up this way and I knew this before I flew the plane but the owner had been flying gently for a while without trouble so I thought we would be OK. |
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Looks fantastic! I'm in pretty good shape and coordinated but on my maiden I couldn't get a successful launch by holding on to the wing ends. Center of the nose, fingers under and thumb on top, overhand at 3/4 throttle and away she goes! Just get on the sticks quick what ever method you use. Also be sure to have the elevons adjusted with a little reflex, both ailerons slightly up as wings like to have. Have a blast!
Blu |
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Thats one good lookin wing, when ya launch give it enough throttle so you can feel her pushing, then just hold her so the other wing is down a bit and just move your arm forward with the wing and let her go, ya dont throw it or spin it, your basically just holding her steady while she gains a bit of momentum, Good luck and have fun.
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Yesterday I taught myself with help from vid's and postings from here to set up my TX = DX6i for elevons and switch assignments for other stuff and I had the plane nose down in a chair, after I had all control doing what I wanted I (out of order) shut off the TX first. The motor went to flat out, sucked up some papers below the nose and by the time I pulled the battery plug I was in a shower of confetti. I got that worked out, maybe. Then it happened again this time the prop chopped a hole thru the back of the chair. I'm a monument and portrait sculptor, I can't let my hands get damaged, Like a musical instrument player, I'm carefully. I just started my 5th overlife sized portrait of Thomas A. Edison. Even my flight instructor at the feild knows not to remove my rubber band that holds back throtle untill we are on the flight line.com Do you think that if I can't be consistent at wing launching I should be exploring the 'sling shot launch' Idea? DJ, Kamikaze Ace (wears no helmet ). |
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Last edited by Sculptor; Oct 14, 2012 at 08:40 PM.
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Just get into the small, good habits from the very beginning. Rubber band on the throttle, a switch programmed to be an instant throttle brake (I leave it on until ready to fly every time), prop removed whenever you're not ready to fly, and a good launch method that keeps your hand not only far from the prop, but also not in the path of the prop post-launch. (I prefer holding the wing about halfway out, thumb on top, throttle up until the plane "wants" to go, then kind of pizza-toss it forward, throttle up, and get on the sticks.)
most of all... ENJOY! That's a killer design! |
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You should always disconnect the plane battery before turning off the transmitter. It will help prevent accidents like the one you mentioned. And if the plane battery is installed, act like the motor could turn on at any moment.
When setting up mixes for the elevons, remove the prop. That way, when the motor turns on unexpectedly, it is less likely to damage you or your property. For launch, I think you are over complicating it with a slingshot and such. I've seen some people throw the wing without throttle then turn on the motor when the wing is well away from their hand. I go with holding it about 3/4 the way from the tip to the nose and give it a slight pull forward with the throttle at 1/2 to 3/4. Wingtip launches tend to make it spin on me, I end up tossing it like a frisbee. Jetpackninja helped me get going with that method. |
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Last edited by ttabbal; Oct 14, 2012 at 09:05 PM.
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