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jbhart(at)onlyinternet.ne
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 Posted: Sun Oct 01, 2006 3:54 am Post subject: trim - Engine Washers |
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From: "Larry Cottrell" <lcottrell(at)fmtcblue.com>
............................
My question is the amount and number of washers under the motor. (plans are
a bit vague) Perhaps the angle of the motor is forcing it down.
............................
Larry,
Number of washers can be determined by used of the slip indicator in level
flight.
Check out:
http://www.thirdshift.com/jack/firefly/firefly56.html
This will remove P-factor slip at cruise speed.
Jack B. Hart FF004
Winchester, IN
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slyck(at)frontiernet.net
Guest
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| Posted: Sun Oct 01, 2006 4:24 am Post subject: trim - Engine Washers |
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Jack, excellent page. Trimming my MkIII will be on the agenda next
year.
BB do not archive
On 1, Oct 2006, at 9:01 AM, Jack B. Hart wrote:
| Quote: |
<jbhart(at)onlyinternet.net>
From: "Larry Cottrell" <lcottrell(at)fmtcblue.com>
.............................
My question is the amount and number of washers under the motor.
(plans are
a bit vague) Perhaps the angle of the motor is forcing it down.
.............................
Larry,
Number of washers can be determined by used of the slip indicator in
level
flight.
Check out:
http://www.thirdshift.com/jack/firefly/firefly56.html
This will remove P-factor slip at cruise speed.
Jack B. Hart FF004
Winchester, IN
|
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Sun Oct 01, 2006 5:26 am Post subject: trim - Engine Washers |
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| My question is the amount and number of washers under the motor.
(plans are
| a bit vague) Perhaps the angle of the motor is forcing it down.
|
| .............................
|
| Larry
Larry:
Yes, a high mounted pusher will definitely push the nose down. Look
at it as a long lever with the thrust on the end of it. My mkIII
needs a lot of nose up trim at cruise, although I have lowered the
leading edge of the horizontal stabilizer somewhat. However, when I
pull the power off or shut the engine down, the aircraft is trimmed up
perfect in pitch and yaw without the aid of forced trim or trim tabs.
Also have to remember how and where the prop wash hits the tail
section. From my experimentation, the prop wash is what we are
working against, not angle of thrust. I did the angle of thrust
experiements many years ago on my FS, primarily to eliminate the
requirement for trim tabs. When it was all over, I put a trim tab on
the rudder, elevator, and aileron. My FS was trimmed out perfectly
and the the trim tabs were not noticeable. In fact, the aircraft won
several nice awards including the small trim tabs.
Take care,
john h
mkIII
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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Mike Schnabel
Joined: 27 Jan 2006
Posts: 114
Location: Manchester, TN
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| Posted: Sun Oct 01, 2006 4:41 pm Post subject: trim - Engine Washers |
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John, curious to know. During your experimentation with the Firestar and trim tabs, were there any significant changes with location? As in, inboard or outboard in the elevator, high or low on the rudder? And did you try one on the aileron as well?
Mike S
Manchester TN
do not archive
Larry:
Yes, a high mounted pusher will definitely push the nose down. Look
at it as a long lever with the thrust on the end of it. My mkIII
needs a lot of nose up trim at cruise, although I have lowered the
leading edge of the horizontal stabilizer somewhat. However, when I
pull the power off or shut the engine down, the aircraft is trimmed up
perfect in pitch and yaw without the aid of forced trim or trim tabs.
Also have to remember how and where the prop wash hits the tail
section. From my experimentation, the prop wash is what we are
working against, not angle of thrust. I did the angle of thrust
experiements many years ago on my FS, primarily to eliminate the
requirement for trim tabs. When it was all over, I put a trim tab on
the rudder, elevator, and aileron. My FS was trimmed out perfectly
and the the trim tabs were not noticeable. In fact, the aircraft won
several nice awards including the small trim tabs.
Take care,
john h
mkIII
Get your email and more, right on the [url=http://us.rd.yahoo.com/evt=42973/*http://www.yahoo.com/preview] new Yahoo.com[/url] [quote][b]
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