Tapio
It's completely normal for the tail tilt to be opposite of what you want at launch. That's why you have left thrust. The left thrust is more effective at the beginning of the flight and overcomes the adverse tail tilt if all is balanced. As torque drops off the left thrust is less effective and the tail tilt returns to normal.
I don't think it's possible to make a motor tube that eliminates this effect. For PP I'm using a tube with spiral wound carbon tow and it still twists.
----- Original Message -----
From: Tapio Linkosalo
To: Indoor_Construction_at_yahoogroups.com
Sent: Wednesday, August 06, 2008 8:11 AM
Subject: Re: [Indoor_Construction] my flying site
On Sat, 2 Aug 2008, Bill Gowen wrote:
> One secret to overcoming a floppy tailboom is to make sure that the left
> side of the stab has washin (trailing edge lower than leading edge).
> This will cause the tailboom to twist at the beginning of the flight,
> increasing the amount of stab tilt and also kicking the tail to the
> outside of the left turn that you want.
Interesting. I have noticed with my F1Ms, that if the tail twist is the
wrong way, the model is very hard to make turn in a small gym. Maybe this
is the reason? I do not know if my tubular boom without boron is floppy
(might be- quite small dia at the end), but at least my motor tube is - I
have noticed that I need to set some additional tilt to the model, as the
twist of the motor tube under full load tends to reduce the twist. If I
start with the amount that I desire for flight, then under full motor load
the tilt has disappeared.
Maybe I should try a boom with larger diameter...
-Tapio-
No virus found in this incoming message.
Checked by AVG -
http://www.avg.com
Version: 8.0.138 / Virus Database: 270.5.12/1592 - Release Date: 8/5/2008 6:03 AM
[Non-text portions of this message have been removed]
Received on Wed Aug 06 2008 - 07:45:57 CEST