----- Original Message -----
From: hrdirks <hrdirks@...>
To: <Q-LIST@...>
Sent: Friday, September 15, 2000 1:19 PM
Subject: Re: [Q-LIST] A simple STOL mod for Qs?

If I remember correctly, early Quickie Newsletters or Quicktalk

Newsletters

advised against spanwise elevator gap seals, because they created a severe
'Dutch Roll' tendency that could get out of hand.

Harold Dirks


----- Original Message -----
From: "Chris McAtee" <Subcanis@...>
To: <Q-LIST@...>
Sent: Thursday, September 14, 2000 4:30 PM
Subject: Re: [Q-LIST] A simple STOL mod for Qs?

I thought that gap sealing was a bad idea on the Q's- flutter reasons.
HAve I been misinformed?

Chris McAtee

=====================================================
From: "Michael D. Callahan" <micallahan@...>
Reply-To: Q-LIST@...
To: <Q-LIST@...>
Subject: Re: [Q-LIST] A simple STOL mod for Qs?
Date: Tue, 12 Sep 2000 23:11:45 -0500

I'm not flying yet, but it sounds plausible. We know there is a
divergent cone at the trailing edge near the fuselage and dropping the
elevator only exacerbates the condition. I'm going to fill the
fuselage/canard intersection vertically and I'm still trying to figure

how

to seal the elevator hinge gap. Maybe the inboard end of the elevator

could

be extended up under the fuselage like a flap? Don't know about STOL but

it

might make it faster (and that's what we like!).
----- Original Message -----
From: Edward N. MacLeod <ed@...>
To: <Q-LIST@...>
Sent: Tuesday, September 12, 2000 7:10 PM
Subject: [Q-LIST] A simple STOL mod for Qs?


>
> For you bored aero intellects out there:
>
> After reading through the archives regarding canard tuft testing and

the

> associated confusing results, I had a thought about what is going on.
>
> What if high-pressure air, under the canard, at the root, is flowing
> around the inboard elevator gap (not the hinge gap) when the

elevator

> is down? This higher pressure air would tend to fill the

low-pressure

> area above the elevator. The lower pressure laminar flow air on the

top

> of the canard would flow over this stationary longitudinal bubble of
> higher pressure air, prematurely stalling the canard, root first.

There

> would be little tendency for the bubble to dissipate as it is not in

the

> slipstream. A relatively low volume flow through the inboard

elevator

> gap could maintain the stationary bubble.
>
> It gets worse. I believe the shape of the gap on Qs when the

elevator

> is down (at least on my Q2) actually directs the air longitudinally
> along the top of the elevator!
>
> The hypothesis is: Seal the gap and you significantly reduce
> elevator-down stall speed.
>
> Does this make sense to anyone else?
>
> Food for thought,
>
> Ed m
>
>
>
>
>
> To unsubscribe from this group, send an email to:
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>
> Quickie Builders Association WEB site
> http://web2.airmail.net/qba321tm/q-page1.html
>
>
>
>

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