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pitch angle prop reverser(prop-r) (Read 217 times)
Nov 29th, 2005 at 4:04am

osvep   Offline
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Hello friends  A few questions on real aviation from a virtual pilot that loves vintage planes:
1)Wich are the main aircrafts with piston engines that have this gadget?2) Are there any fsmodel of it? 3)If a pilot has to descent quickly in that "big wings" planes are flaps sufficient ?.Those designs were easy to take off but hard to descend in my humble fs experience and the use of prop-r in turboprops is very usefull Thanks and  regards.pd look the boeing 247,the dove,the dc3etc.  ???
 
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Reply #1 - Nov 29th, 2005 at 7:12am

beaky   Offline
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Quote:
Hello friends  A few questions on real aviation from a virtual pilot that loves vintage planes:
1)Wich are the main aircrafts with piston engines that have this gadget?2) Are there any fsmodel of it? 3)If a pilot has to descent quickly in that "big wings" planes are flaps sufficient ?.Those designs were easy to take off but hard to descend in my humble fs experience and the use of prop-r in turboprops is very usefull Thanks and  regards.pd look the boeing 247,the dove,the dc3etc.  ???


Don't know how many FS models have working reverse pitch, but I do know that in the old prop transports, that was only used to reduce speed in flight in the most dire emergencies... generally, even in an emergency, power would be reduced, a circling approach would be used, and gear and flaps would be lowered ASAP.
Never heard of modern turboprops using negative pitch in flight, but I suppose it's possible.
There is a freeware B377 that has working "reverse thrust", but it's not supposed to be used in flight, just like on a jet with thrust buckets... it's used only to slow down after all the wheels are touching the runway, and even then only below a certain IAS.
There's no reason why normal approaches in a big multi prop should be difficult in terms of descending- sounds like you're just not throttling back early enough, or you're pitched down too much on final and not letting the airspeed bleed off.  If you pull the power out and just hold the nose where it is, the plane will eventually begin to sink. You're better off then using a bit of power to control descent rate instead of changing your pitch angle.
  It took me a while to get used to the FS9 DC3, but once you figure out how soon to set up for approach and religiously stay below 90 kts on final, it's easy to avoid overshooting.
 

...
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Reply #2 - Nov 29th, 2005 at 7:23am

C   Offline
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Quote:

Never heard of modern turboprops using negative pitch in flight, but I suppose it's possible.


Mmm, I wouldn't be too sure. Certainly in my experience you get enough of a braking force from the prop when the engine is at flight idle, and the throttle can't be move past flt idle until the aircraft is firmly on the ground. Every aircraft is of course different, but I'm sure it would be potentially very dangerous even if you were able to accidentally select the throttle even just very slightly into reverse...
 
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Reply #3 - Nov 29th, 2005 at 4:43pm

The Ruptured Duck   Offline
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Caravans and King Airs have prop feathering which moves the prop to beta (almost perpendicular to the wings)
 

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Reply #4 - Nov 29th, 2005 at 11:12pm

Skligmund   Offline
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Yup, so does the Beech 1900. I've heard of pilots landing with reverse like 10-20 feet in the air, lands hard, but stops FAST.
 

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Reply #5 - Dec 2nd, 2005 at 3:14am

osvep   Offline
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Thanks rotty and others.I agree about procedures but think flying an il14 or a dhav dove with very low rate of proper descent or a bristol brigand that very fast bomber .We have no spoilers nor pitch reverser as in the turboprops if we MUST descend quickly because fuel shortage or fire in an engine we cannot take many time  or make a dive that increases sharply the speed avoiding safe landing...What surprises me is that the technology of prop rev was available at the moment the designers worked on that models(early forties).I know convairs 240 340 dc6 dc7 has it (check models of calclassic ) Anyway mfs designers may include this gadget and I hope they will at least in a concept plane
that may combine good wings (no more than 200kg/m2)
good power and good sounding( fast responsive piston radials) The combination of old and modern style in a 10 tons aircraft is my favorite... regards. Roll Eyes
 
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Reply #6 - Dec 2nd, 2005 at 7:17am

Brett_Henderson   Offline
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The de Havilland Dove is mentioned here. Every now and then .. flight dynamics are put together that are "uncanny" real. The Dove feels more like flying a real plane than even the RealAir C172. You  MUST use your rudder properly and you MUST  nail your approach speeds to pull off nice, realistic landings. You even need to keep weight off of the nose wheel during takeoff roll and after landing.

Anyway.. to get a quick, emergency descent out of the Dove (or any plane, really) you need to climb a bit first to get into the white arc on the ASI... THEN dump full flaps and gear.. Trust me, that Dove will come down quicker than you want it to...   Wink

You'll have to hold the nose WAY down to keep up a safe approach speed !
 
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Reply #7 - Dec 5th, 2005 at 2:33am

osvep   Offline
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Thanks brett  I will use the procedure you mention which I didnt know.I apologize to the experts but is difficult to learn many basics of flying. Mfs is a great program but we the beginners and only virtual pilots have many holes whith merely the default lessons. Embarrassed
 
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