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First plane already down :(
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elolz_Au View Drop Down
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Posts: 83 		  Quote elolz_Au Quote  Post ReplyReply Direct Link To This Post Topic: First plane already down :(
    Posted: 11/Feb/2012 at 8:07am
I am new to this hobby and finished building my parkjet last night, It isn't a stock parkjet it has a 3400kv brushless motor, 45amp ESC, 4.5x4.5e prop and a 3cell rhino 1350 25c series lipo.

Well i try'd to give it a maiden flight but it kept rolling left and down every time i chucked it in the air. I double checked to see if it was centered and it was. Well long story short the 20mm stick mount snapped, in the process making the prop chew up the left and right elevators. Prop is completely screwed. :(

I didn't even get to have 1 good fly :( time for me to buy some replacement parts
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KaosKane View Drop Down
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Posts: 1181 		  Quote KaosKane Quote  Post ReplyReply Direct Link To This Post Posted: 11/Feb/2012 at 9:38am
It is possible this is torque roll u may need to adjust ut trimm to suit next time HTH :}
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Mustang Sally View Drop Down
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Posts: 1956 		  Quote Mustang Sally Quote  Post ReplyReply Direct Link To This Post Posted: 11/Feb/2012 at 6:37pm
Wrong beginners plane, simple as that!
A minimal technical knowledge is required for this hobby; please ensure you know the differences between up and down.
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coptor View Drop Down
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Posts: 847 		  Quote coptor Quote  Post ReplyReply Direct Link To This Post Posted: 11/Feb/2012 at 6:59pm
If it's the hobbyking parkjet, then you should NEVER use the motor mount that came with it.


Notorious for nose dive due to wrong thrust angle.


I still can't understand why hobbyking still supply that kit with the problematic mount without explaining how to mount the right angle.


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mabaa View Drop Down
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Posts: 315 		  Quote mabaa Quote  Post ReplyReply Direct Link To This Post Posted: 12/Feb/2012 at 3:52am
Originally posted by Mustang Sally

Wrong beginners plane, simple as that!


Yes I think that you are right and it reminds me of this video.

There is a light at the end of every tunnel….just pray it’s not a train!.
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elolz_Au View Drop Down
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Posts: 83 		  Quote elolz_Au Quote  Post ReplyReply Direct Link To This Post Posted: 12/Feb/2012 at 4:34am
Originally posted by Mustang Sally

Wrong beginners plane, simple as that!


I 100% agree with you, I should have got the bixler or j3 cub. I will buy one of those when i buy replacement parts for my parkjet


Originally posted by coptor

If it's the hobbyking parkjet, then you should NEVER use the motor mount that came with it.
Notorious for nose dive due to wrong thrust angle.
I still can't understand why hobbyking still supply that kit with the problematic mount without explaining how to mount the right angle.


Is there anything i can do to fix the angle/problem. I'm using the stock stick mount with this motor mount:




LOL @ the video.. That's mocking me
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mabaa View Drop Down
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Posts: 315 		  Quote mabaa Quote  Post ReplyReply Direct Link To This Post Posted: 12/Feb/2012 at 7:41pm
Well i'm not experienced with ur pusherjet but here are a few links
maybe it helps.

http://www.wattflyer.com/forums/showthread.php?t=64121

http://www.youtube.com/watch?v=LYz2QA8CEFU    100 mph

http://www.hobbyking.com/hobbyking/forum/forum_posts.asp?TID=15468


There is a light at the end of every tunnel….just pray it’s not a train!.
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Maximilionalpha View Drop Down
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Posts: 516 		  Quote Maximilionalpha Quote  Post ReplyReply Direct Link To This Post Posted: 13/Feb/2012 at 3:54am
Originally posted by KaosKane

It is possible this is torque roll u may need to adjust ut trimm to suit next time HTH :}
Torque roll, plain and simple. The prop spins from left to right, meaning the motor spins from right to left. To compensate for this, you must mount the motor at 2 degrees downward and 3 degrees to the right. That should do it. Even if you don't rebuild and fly this particular plane again, just remember that you will always need a total of 5 degrees of motor offset to cancel out torque. You can use shims of some type/miniature washers or thin pieces of plastic from a folder. Happy Flying!
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elolz_Au View Drop Down
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Posts: 83 		  Quote elolz_Au Quote  Post ReplyReply Direct Link To This Post Posted: 13/Feb/2012 at 4:31am
Originally posted by mabaa

http://www.youtube.com/watch?v=LYz2QA8CEFU 100 mph


Everything in this video is what i have on/in my plane. I noticed that in this video he has lowered the stick mount by cutting the stick slot deeper. Would this be to get the right angle of the motor?

Also do you know what the black strip is under the the plane? normal covering film?
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elolz_Au View Drop Down
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Posts: 83 		  Quote elolz_Au Quote  Post ReplyReply Direct Link To This Post Posted: 13/Feb/2012 at 4:44am
Originally posted by Maximilionalpha

Originally posted by KaosKane

It is possible this is torque roll u may need to adjust ut trimm to suit next time HTH :}
Torque roll, plain and simple. The prop spins from left to right, meaning the motor spins from right to left. To compensate for this, you must mount the motor at 2 degrees downward and 3 degrees to the right. That should do it. Even if you don't rebuild and fly this particular plane again, just remember that you will always need a total of 5 degrees of motor offset to cancel out torque. You can use shims of some type/miniature washers or thin pieces of plastic from a folder. Happy Flying!


So to fix the torque roll all i need to do is mount the motor 2 degrees downwards and 3 degrees to the right
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