Ricky_231 Posted April 18, 2020 Report Share Posted April 18, 2020 Started working on my commercial ground school so I can take the written when all the madness is over. Look what I found in the "secondary flight controls" lesson: Quote Link to comment Share on other sites More sharing options...
carusoam Posted April 18, 2020 Report Share Posted April 18, 2020 Looks like Mr. King. Is he yelling over to Martha? They like Mooneys... They had a Mooney give-away around Y2K... That plane is around here somewhere... Best regards, -a- Quote Link to comment Share on other sites More sharing options...
MooneyMitch Posted April 18, 2020 Report Share Posted April 18, 2020 I sure had some fun with my former speed brakes!! Sometimes, with no other traffic in the area, it was fun to come ripping into the pattern, chop the power, throw out the brakes and drop the gear almost simultaneously...... super fun it was. And John King hasn’t aged a bit 3 Quote Link to comment Share on other sites More sharing options...
Ross Taylor Posted April 18, 2020 Report Share Posted April 18, 2020 I didn't realize how much I'd like them, too. They certainly aren't necessary, by any means, and I don't use them all the time...but they're handy to have in the "toolbox." And @Ricky_231 good for you, making the most of this time. Right on... Quote Link to comment Share on other sites More sharing options...
MikeOH Posted April 19, 2020 Report Share Posted April 19, 2020 My plane has them, but it wasn't something I was shopping for and, if you took them away, I wouldn't really miss them. But, when SoCal keeps me at 5,000 AGL until 5 miles from the airport they sure are kinda nice 1 Quote Link to comment Share on other sites More sharing options...
Bob - S50 Posted April 19, 2020 Report Share Posted April 19, 2020 In the DC9 we called speedbrakes erasers because you only used them to correct a mistake. 2 3 Quote Link to comment Share on other sites More sharing options...
Emmet Posted April 19, 2020 Report Share Posted April 19, 2020 Mmh ... I thought the primary purpose is to destroy airflow ... Quote Link to comment Share on other sites More sharing options...
Ricky_231 Posted April 19, 2020 Author Report Share Posted April 19, 2020 Mmh ... I thought the primary purpose is to destroy airflow ... Yeah I had that same reaction. Somebody on MS posted a video of speedbrakes being deployed in the rain and you can clearly see the effect on flow over the wing. Interesting that on the King course, when they talk about spoilers he says they’re for reducing lift and increasing drag, but then when he introduces speedbrakes he specifically says they only increase drag. I guess that you could say that it increases drag relative to lift as you reduce lift...Sent from my iPhone using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
GeeBee Posted April 19, 2020 Report Share Posted April 19, 2020 The DC-9 does not have speed brakes. It has noise generators. Quote Link to comment Share on other sites More sharing options...
squeaky.stow Posted April 19, 2020 Report Share Posted April 19, 2020 Mr. King is right. A spoiler increases drag by a combination of profile drag and killing lift on a portion of the wingspan which must be compensated for by increasing lift on the rest of the wing (unless you want to descend) by increasing AOA and thus increasing induced drag. Technically our Mooney “speedbrakes” are closer to spoilers than speedbrakes, however the small span means they have only limited effect on lift. A true speed brake creates only profile drag. A little less efficient but has the advantage of not killing lift when you don’t want it to. 1 Quote Link to comment Share on other sites More sharing options...
EricJ Posted April 19, 2020 Report Share Posted April 19, 2020 The T-39 had a very effective air brake that doubled as egress protection. There's an escape hatch in the floor that you can get out if the air brake is open. I always wondered whether anybody actually ever bailed out of one those, but I'm guessing there may have been a number of special deliveries made that way. Quote Link to comment Share on other sites More sharing options...
MooneyMitch Posted April 19, 2020 Report Share Posted April 19, 2020 2 hours ago, EricJ said: The T-39 had a very effective air brake that doubled as egress protection. There's an escape hatch in the floor that you can get out if the air brake is open. I always wondered whether anybody actually ever bailed out of one those, but I'm guessing there may have been a number of special deliveries made that way. Ah ha! Al Mooney’s Jetstar 1 Quote Link to comment Share on other sites More sharing options...
N201MKTurbo Posted April 19, 2020 Report Share Posted April 19, 2020 2 hours ago, MooneyMitch said: Ah ha! Al Mooney’s Jetstar Saberliner. Quote Link to comment Share on other sites More sharing options...
MooneyMitch Posted April 19, 2020 Report Share Posted April 19, 2020 8 minutes ago, N201MKTurbo said: Saberliner. Whoops, sorry. I mistook the photo to be the Lockheed Jetstar. Quote Link to comment Share on other sites More sharing options...
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