4 ms·

check out Quickie and Q2 https://en.wikipedia.org/wiki/Rutan_Quickie https://en.wikipedia.org/wiki/Rutan_Quickie t tails on most business jets etc.

jackyinger 6y ago
There are certainly successful exceptions to this rule. In the see exceptions I’m sure that the engineering was done to mitigate the risk. For instance with T tails, the designer would hopefully either place the elevator high enough to be out of the dirty air, or do the analysis to make sure it functioned well in he dirty air.
- baybal2 6y ago
  Rutan Quickie is subject to deep stall, and it has an AOA never exceed limit because of it.
  - kashkhan 6y ago
    all configurations have advantages and disadvantages. Most civilian jets have tails which are mounted higher than the main wing. The position matters when you are talking about not getting into stall and then recovering from a stall. A lower tail is definitely better for an inexperienced pilot or a pilot in a bad situations. And the safety records of high wing planes like Cessna 172 speak to that.
- kashkhan 6y ago
  there are a lot of exceptions. In case of Business jets it's almost a rule to have a t tail.
mannykannot 6y ago
There was, in fact, a serious problem with T-tailed jets: Superstall, an irrecoverable stall where the turbulent wake of the stalled wing over the stabilizer and elevator prevents recovery. A crash of a BAC 111 prototype led to the development of stick shakers and pushers, as stalling presents an unacceptable risk in these cases. It is exacerbated with swept wings having a tendency to stall at the wingtips first, as this typically creates a pitching-up moment.
- kashkhan 6y ago
  When first discovered it was new, but now almost all bizjets have t tails. So it definitely wasn't a fatal flaw but an engineering problem with the configuration.
  - mannykannot 6y ago
    Indeed - there is certainly nothing inherently risky about T-tails, as the many T-tailed sailplanes with relatively docile stall/spin characteristics attest.

jackyinger 6y ago

There are certainly successful exceptions to this rule. In the see exceptions I’m sure that the engineering was done to mitigate the risk. For instance with T tails, the designer would hopefully either place the elevator high enough to be out of the dirty air, or do the analysis to make sure it functioned well in he dirty air.

baybal2 6y ago
Rutan Quickie is subject to deep stall, and it has an AOA never exceed limit because of it.
- kashkhan 6y ago
  all configurations have advantages and disadvantages. Most civilian jets have tails which are mounted higher than the main wing. The position matters when you are talking about not getting into stall and then recovering from a stall. A lower tail is definitely better for an inexperienced pilot or a pilot in a bad situations. And the safety records of high wing planes like Cessna 172 speak to that.
kashkhan 6y ago
there are a lot of exceptions. In case of Business jets it's almost a rule to have a t tail.

mannykannot 6y ago

There was, in fact, a serious problem with T-tailed jets: Superstall, an irrecoverable stall where the turbulent wake of the stalled wing over the stabilizer and elevator prevents recovery. A crash of a BAC 111 prototype led to the development of stick shakers and pushers, as stalling presents an unacceptable risk in these cases. It is exacerbated with swept wings having a tendency to stall at the wingtips first, as this typically creates a pitching-up moment.

kashkhan 6y ago
When first discovered it was new, but now almost all bizjets have t tails. So it definitely wasn't a fatal flaw but an engineering problem with the configuration.
- mannykannot 6y ago
  Indeed - there is certainly nothing inherently risky about T-tails, as the many T-tailed sailplanes with relatively docile stall/spin characteristics attest.