Today's Message Index:
----------------------
1. 05:05 AM - Re: Door open flight (Thom Riddle)
2. 12:58 PM - Re: door open or door off flight in Allegro? (Dave Grosvenor - DreamWings)
3. 01:15 PM - drag polar and V speeds (Thom Riddle)
4. 11:24 PM - Re: drag polar and V speeds (Paul@AeroSiam)
Message 1
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| Subject: | Re: Door open flight |
--> Allegro-List message posted by: "Thom Riddle" <jtriddle@adelphia.net>
I just got a reply from the USA importer, B Bar D Aviation. Following is what they
say about flying an Allegro with doors open/off.
Thom in Buffalo
Thom,
The Allegro MAY be flown with the doors open, but the MAXIMUM speed is 80mph.
You may open the doors in flight, but be aware you MUST hold the door tightly,
to prevent a rapid upswing into the wing. You may also close them in flight
(again, at a max speed of 80mph). when closing, you MUST hold the door firmly
to prevent a rapid upswing into the wing. You may take the doors off and fly
any speed the Allegro will safely fly. Please note: always check your doors
first to insure there is not too much "play" to allow the doors to "beat" against
the top of the wing when preparing to fly with the doors open. If this happens,
you will create a "mar" line horizontally across the window. So, have
fun, and enjoy the fresh warm air.
Thanks,
Doug & Betty
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=32262#32262
Message 2
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| Subject: | Re: door open or door off flight in Allegro? |
--> Allegro-List message posted by: "Dave Grosvenor - DreamWings" <dave@dreamwings.co.za>
Hi Thom
I have often flown our Allegro with one door open. I open and close it in
flight, but keep the speed to 80 mph max. I have never opened both doors in
flight at the same time. I did try flying with both doors removed. There
was a lot of buffeting in the cockpit that made it unpleasent. Otherwise no
adverse effects.
Regards
Dave Grosvenor
DreamWings cc
Durban, South Africa
dave@dreamwings.co.za
www.dreamwings.co.za
----- Original Message -----
> Time: 07:24:38 AM PST US
> Subject: Allegro-List: door open or door off flight in Allegro?
> From: "Thom Riddle" <jtriddle@adelphia.net>
>
> --> Allegro-List message posted by: "Thom Riddle" <jtriddle@adelphia.net>
>
> It is warming up here in upstate New York and I'm thinking of flying the
> Allegro
> w/ door open. I have a couple of questions in this regard:
> 1. What is the limiting speed is for door OPEN flight?
> 2. What is the limiting speed for door OFF flight?
> 3. Can the doors be opened and closed during flight, assuming below the
> limit speed,
> or must the doors remain in either open or closed state after take-off?
>
> Thom in Buffalo
>
>
Message 3
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| Subject: | drag polar and V speeds |
--> Allegro-List message posted by: "Thom Riddle" <jtriddle@adelphia.net>
Does anyone have access to the drag polar for the Allegro? For those who don't
know, that is the graphical curve that illustrates the total drag of the aircraft
on the vertical Y-axis and the airspeed on the horizontal X-axis. A related
question: does anyone know the Vx and Vy airspeeds for the Allegro? I don't
recall seeing these numbers in the operators manual but I've heard that 70 mph
(61 knots) is Vy, but our Allegro gets a better rate of climb solo at around
75-80 mph IAS (about ~72 CAS). Since Vy decreases with weight Vy solo should be
lower than Vy at MTOW, which is what most manual use for the V speeds.
The reason behind the questions is that I want to try to see if I can find some
thermals tomorrow and get the Allegro to climb at idle power in a strong updraft
and stay in the updraft. In other words I want to see if the Allegro can be
soared a bit. The minimum sink rate speed would be helpful for this as well.
Thom in Buffalo
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=32372#32372
Message 4
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| From: | "Paul@AeroSiam" <Paul@aero-siam.com> |
| Subject: | Re: drag polar and V speeds |
--> Allegro-List message posted by: "Paul@AeroSiam" <Paul@aero-siam.com>
Thom
I also recall 61 kts but I don't know where.
If you are going to do some flying at idle, what about using the VSI and GPS
to determine the speed for min sink and the glide ratio for max L/D? would
that work?
presumably, min sink should relate to Vx and best glide ratio to Vy. In my
book it says Vy is typically 1.4 stall speed which suggests 64 kts IAS or 60
CAS which seems about right.
It also says that a rule of thumb is that min sink rate is 0.75 of best
glide speed which gives 48 IAS or 45 CAS which seems low but I remember
from flying the 701 that Vx is just a few knots above stall speed.
"Since Vy decreases with weight..........." - don't you mean increases
with weight?
Regards
Paul
----- Original Message -----
From: "Thom Riddle" <jtriddle@adelphia.net>
Sent: Wednesday, May 03, 2006 3:15 AM
Subject: Allegro-List: drag polar and V speeds
> --> Allegro-List message posted by: "Thom Riddle" <jtriddle@adelphia.net>
>
> Does anyone have access to the drag polar for the Allegro? For those who
> don't know, that is the graphical curve that illustrates the total drag of
> the aircraft on the vertical Y-axis and the airspeed on the horizontal
> X-axis. A related question: does anyone know the Vx and Vy airspeeds for
> the Allegro? I don't recall seeing these numbers in the operators manual
> but I've heard that 70 mph (61 knots) is Vy, but our Allegro gets a better
> rate of climb solo at around 75-80 mph IAS (about ~72 CAS). Since Vy
> decreases with weight Vy solo should be lower than Vy at MTOW, which is
> what most manual use for the V speeds.
>
> The reason behind the questions is that I want to try to see if I can find
> some thermals tomorrow and get the Allegro to climb at idle power in a
> strong updraft and stay in the updraft. In other words I want to see if
> the Allegro can be soared a bit. The minimum sink rate speed would be
> helpful for this as well.
>
> Thom in Buffalo
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=32372#32372
>
>
>
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