Jayspilot From United States of America, joined May 2001, 297 posts, RR: 0 Reply 3, posted (9 years 10 months 2 weeks 1 day 20 hours ago) and read 2863 times:
if you are talking about spoilers or speed brakes.. if so, yea some do.. i know the dash does...dornier does, beech doesn't .. not sure about ATR or SAAB. they arent' needed as much on a propeller aircraft, due to the fact that changing of the blade angle bringing back the power levers back creates a lot of drag and allows the planes to slow quick.. hope this answers your question
Access-Air From United States of America, joined Sep 2000, 1939 posts, RR: 14 Reply 5, posted (9 years 10 months 2 weeks 1 day 20 hours ago) and read 2755 times:
The Fairchild Hiller FH-227 used its main landing gear as a speed brake inflight to lose altitude quick as well as speed. This was also the case on some of the later versions of the Fairchild F-27 series....
Dont think that Fokker ever employed this feature on their F.27s....
ScooterTrash From United States of America, joined Aug 2001, 569 posts, RR: 9 Reply 6, posted (9 years 10 months 2 weeks 1 day 20 hours ago) and read 2714 times:
I have flown the ATR as well as the Dash 8. No speed brakes per say on either aircraft. However, as was stated above, bringing the props to max rpm and the power levers to flight idle will result in the props becoming a very effective speed brake (high rpm, low pitch).
Jayspilot From United States of America, joined May 2001, 297 posts, RR: 0 Reply 8, posted (9 years 10 months 2 weeks 1 day 18 hours ago) and read 2621 times:
Speed brakes and spoilers are the same parts moving on the plane.. Flight spoilers don't deploy to the same angles as ground spoilers and and not as many of the panels move for flight. As for not noticing them on props, the only ones I've seen that have them are high wings so you can't see them from inside, only notice them while holding short behind them or watching one land
Miles_mechanic From Canada, joined Sep 2001, 133 posts, RR: 0 Reply 9, posted (9 years 10 months 2 weeks 1 day 17 hours ago) and read 2587 times:
Hey, as far as the Dash 8 goes, the 300 and 400 series do have spoilers.
As for actual air brakes, the Fokker F-27, was a pneumatic system, so the brakes, and other systems relied on air pressure to operate. It was a good system meaning you would never run out of supply, but in the winter months up here in Canada, it also became a curse when moisture would get in the lines and freeze. I have heard a few stories from friends who used to work on them and enjoyed working on them, but the winter time caused headaches.
Miles_mechanic From Canada, joined Sep 2001, 133 posts, RR: 0 Reply 11, posted (9 years 10 months 2 weeks 1 day 16 hours ago) and read 2520 times:
Hey Skydrol, you are absolutely right about the Dash 8s', sorry about that, I ment to say that they were automatically activated on the 300 and 400 models, where the early ones it was a manual system, from what I had read about them.
SlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 69 Reply 14, posted (9 years 10 months 2 weeks 1 day 6 hours ago) and read 2360 times:
To be more accurate:
Spoilers "Spoil" the wing shape. They are hinged panels that deflect, usually up, from the surface of the wing. They have two modes:
Flight Spoilers kill some of the lift and allow quicker deceleration in level flight or steeper descents without airspeed gain. They may or may not include all of the available panels but will usually only allow partial extension.
Ground Spoilers include all panels to full extension. On ground contact, either strut compression or wheel spinup, kill most of the lift, transferring the weight of the plane to the wheels allowing effective braking. Remember, a moment earlier the wings were carrying the weight and the brakes would just lock the wheels if used.
Speed Brakes Are mounted on the fuselage or even the vertical tail in some military models. On the Fokker F-28 and F-100 and the BAe-146 they are the rearmost part of the fuselage, just below the rudder. They add drag but do not affect the lift being generated.
Happiness is not seeing another trite Ste. Maarten photo all week long.
ScooterTrash From United States of America, joined Aug 2001, 569 posts, RR: 9 Reply 17, posted (9 years 10 months 2 weeks 19 hours ago) and read 2262 times:
True about the Dash 8's spoilers. They function in two regimes: In flight, they act as roll control augmentation and on the ground they act as lift dumping devices. There are four panels on the upper wing. They all act to assist roll control below 140 knots TAS. Above 140 knots, only the inboard spoilers operate. They are not used as speed brakes during flight.
The Dash 8-100 and some -300's are equipped with another set of panels, called "ground spoilers" to further dump lift during the landing roll out. Many operators have deactivated these to save maintaining costs.
The ATRs also have "spoilerons" to assist with roll control.
Francoflier From France, joined Oct 2001, 3521 posts, RR: 11 Reply 19, posted (9 years 10 months 1 week 6 days 18 hours ago) and read 2153 times:
The LET 410 has spoilers on the wing. They are used to shorten landing distance and may only be deployed on the ground or at a max "altitude" of 2 feet above the ground, but never during flight... (a friend of mine who tried could tell you that...)
The Jetstream 31 have what they call a "lift dump" which simply consists of the wing flaps going down almost vertical after touchdown. (Only on the ground too..)
The F-227 used its main gear as a speed brake, as mentioned above, which very often caused the crews to receive warning from other caring crews saying that their nose gear hadn't come down...
BTW, Fokker enthusiats are never out of compliments for that pneumatic system, but in the end, it caused more trouble than it solved. As in: too many leaks, that are impossible to find, water freezing in the lines (mentioned above) and the all too common case of the A/C collapsing on the ground because someone forgot to put the ldg gear pins on and all the air finally leaked from the actuator...
Just a few more example of "speed brakes" or "lift dump" devices on turboprop but I don't know of one having proper "speed brakes" either...
Looks like I picked the wrong week to quit posting...