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vne speed

 
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Bob Griffin



Joined: 22 Jan 2006
Posts: 34
Location: Slingerlands,NY

PostPosted: Fri Feb 10, 2006 4:37 am    Post subject: vne speed Reply with quote

Good morning,   I know the vne speed for the SLSA Allegro here in the US is posted at 137mph as the FAA regulates it to a maximum138mph. What I am wondering is what is the design speed of the aircraft?  What are the speeds for this plane in other parts of the world? Is the VNE in Europe or Asia the same? Was the plane actually designed to go faster, safely?
Fly Safe
Bob Griffin


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Bob Griffin
Slingerlands, NY
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Aero Siam



Joined: 30 Jan 2006
Posts: 16
Location: Thailand

PostPosted: Fri Feb 10, 2006 7:04 am    Post subject: Re: vne speed Reply with quote

Bob

As quoted by the manufacturer, the Vne of the Allegro 2000 is 220 kilometers per hour which is 136.71 mph or 118.8 knots.

This is the design Vne and there are no variations of this.

One regional variation that does exist is the maximum take off weight. In some European countries, this is limited to 992lb but the design take off weight is 1146lb.

On the subject of V speeds, I asked the factory whether there was a different VFE for first stage flap as is the case for some aircraft particularly given that the Allegro has an unusually large second stage flap deflection (from 15 to 48 degrees). They said that for safety and simplicity, the VFE for both stages is set by the designer at 60 knots but in reality, VFE stage one flap was probably higher.

However, if the design stipulates 60 knots for both stage one and two, let's stick to it.

Regards

Paul
Aero Siam


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Thom Riddle



Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

PostPosted: Fri Feb 10, 2006 12:57 pm    Post subject: Re: vne speed Reply with quote

My ASI reads roughly 10% faster than CAS over most of the speed range so I add this to the IAS for Vfe and other V numbers. Speaking of ASI errors, has anyone tried to adjust their ASI to make their IAS read closer to CAS?

On a related subject...

The USA LSA limitaion for Vs (45 knots - w/o flaps) is probably what allowed the MTOW (MAUW) to be raised to 1,232 lb (560 kg) in the USA. The test results in the operator's manual indicates a CAS for stall with 0 flaps to be 43 knots at a weight of 520 kg. thus allowing a higher MTOW and still meet the max. Vs limitation.

Thom in Buffalo


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