Trim Problems & MT Prop

Subject: Hi Fellow Taifun Owners
From: "birtrum" <birtrum@
Date: 9/28/06 1:29 AM
To: Taifun17E@yahoogroups.com

Hi I'm part of a five man syndicate based in Blackpool UK (EGNH). We
are looking for three new members if anyone is interested otherwise
the whole aircraft may be up for sale. I'm an instructor on Grob
109B's at the weekend and can help anyone who would like to make a
comparison. Although to be honest, there is nothing that I have flown
that is anywhere near as good as a Taifun.

Look forward to hearing from you.

David Birtwhistle (Birty)

PS If you Taifun doesn't fly straight drop me a line and I'll tell you
what to do. It's all to do with checking your wing geometry.

Subject: RE: [Taifun17E] Hi Fellow Taifun Owners
From: "cliff johnsen" <chicocliff8
Date: 9/28/06 7:44 AM
To: Taifun17E@yahoogroups.com
BCC:
Thanks for the reply. My taifun does take a little left stick to go straight. It will go into a diving rignt turn if let go. Also, my trim doesnt have enough play to nose up the plane. Do you have any subbestions here. It is usually in the all the way up for takeoff and moved forward just a little bit for cruse.

Subject: Re: [Taifun17E] Hi Fellow Taifun Owners
From: Haim <zaklad@
Date: 9/28/06 11:25 PM
To: Taifun17E@yahoogroups.com

Hi Berty

We, a three man syndicate in Israel, have the following problem related to your comment:

When we got the Taifun we found that in a straight flight and “0” flaps position, a nagging left pressure on the stick is required to keep in a level flight. In a “-8” position the required pressure is much greater..

We have attempted to adjust the flaps such that at “0” both flaps are in-line with the trailing edge. After such adjustment, it appears that at "-8" the flaps drops equal distance on both sides (I will confirm again). Never the less, the problem persists. I did not attempt yet to adjust for "no pressure" at "0", only geomntrical adjustment.

The adjustment was done at the linkage behind the seats. The fact that in a “-8” the required pressure is higher may be indicative of a residual geometrical imbalance due to slack that is expressed by the air pressure during flight. A twisted wing? Any idea?

Thanks for comments

Subject: Re: [Taifun17E] Hi Fellow Taifun Owners
From: "cliff johnsen" <chicocliff8
Date: 9/29/06 8:36 AM
To: Taifun17E@yahoogroups.com
BCC:
mine does the same thing
 

Subject: Re: Hi Fellow Taifun Owners
From: "jeleedy99352" <JELEEDY@XL1xQKwi7l4qKuPXq_l_1LGB7cHVw_x5GonQ_5jPEFXVnXHl0xPvLir6MLGjvoxT9ZTLUwZ3yg.yahoo.invalid>
Date: 9/29/06 10:34 PM
To: Taifun17E@yahoogroups.com

>> > >I found that I did not have enought up trim when flying slow and
soaring and found that when I did my first my first wt and balance
that I was nose heavy and calculated I could add 22 pounds to the
tail I chickened out and put in 11 pound of lead in the bottom of the
fusalage just in front of the rudder. This took care of the problem
with the elevator trim the fact that one needs full up trim probably
indicates that you are nose heavy Jim Leedy N9MA

Subject: Re: Hi Fellow Taifun Owners
From: "Finbar Sheehy" <finbarsheehy@whg3dmxz_G7h0ToVO2bQSzyv8yc3a1fT_dtJhpzatuzf5tPvQgFMAlWLJ77fhHFf15rN543_czzjIkXQjDQ.yahoo.invalid>
Date: 10/1/06 12:24 PM
To: Taifun17E@yahoogroups.com

While exploring the various flight characteristics of my new toy, I
also found the same thing, and the prior owner says the previous one
he owned also did the same thing. I found lateral trim is neutral at
lower speeds, lower power settings, but accelerating up to cruise
speed it developed a noticeable right-turn tendency that required a
little left pressure on the stick. At full cruise speed it seemed to
require less pressure, but still a little. I suspect our aircraft are
all properly rigged and trim straight as gliders, while at low speeds
the aileron control forces are so light we just don't notice the turn
tendency with power on (I didn't test that theory by letting go the
stick - forgot all about it!)

Subject: trim problems and MT prop
From: "jeleedy99352" <JELEEDY@fzL1t9enXQItdZbyut-pQYp07wnwF-FCaHvGi8eZ5cvGZn8Ze9gJVc2iWhVUsdAb44M8OOOGUeSpQA.yahoo.invalid>
Date: 9/29/06 10:48 PM
To: Taifun17E@yahoogroups.com

I suspect that cliff's trouble with his up trim is related to a nose
heavy wt and balance. I checked my wt and balance 8 years ago. At that
time my trim was ok for cruise flight but at slow soaring turns I did
not have enought up trim. The wt and balance showed I could add 22
pounds to the tail and still be in limits I added 11 pounds to the
bottom of the fusalage in front of the rudder and still found I could
add more but the slow flight trim was fixed. I don't suspect that the
trouble is with the trim but with wt and balance. In respect to the mt
prop I put a constant speed unit on it and loved it in cruise. I did
not like the 90 sec feather and unfeather time but truely could not see
much change in soaring performance so after a while did not bother to
unfeather the prop. Jim Leedy N9MA