Q wrote:Hi Y'All Folks,
I noticed most jets are using spoilers on the wing, It's very common. I noticed most propellers do not need spoilers exception Dash 8 has spoilers. It's rare. Why propellers do not need spoilers what was the reason. Is that propeller cause not even flying if spoilers on? I am not sure. Anyone can explanation, please?
Lpbri wrote:F-100s did not have wing spoilers but had a tail speed brake. Lift dumpers were wing mounted but we're ground use only.
EssentialPowr wrote:A 5-6 bladed propeller is essentially non functional above 28000 or so feet. As an extreme, the TU 95 shows us that blade counts have to increase with increasing altitude.
jking629 wrote:EssentialPowr wrote:A 5-6 bladed propeller is essentially non functional above 28000 or so feet. As an extreme, the TU 95 shows us that blade counts have to increase with increasing altitude.
In what sense is a 5-6 bladed propeller non functional above 28,000 feet?
It seems to me that there are plenty of aircraft with 4-5-6 blades that routinely fly above 28,000 feet. For example, the Piaggio P.180 Avanti (5 blades) has a service ceiling of 41,000 feet, and the Beech King Air 350 (4 blades) has a service ceiling of 35,000 feet. Looking at historical aircraft there's the Supermarine Spitfire Mk VII (4 blades), a high altitude reconnaissance model with a service ceiling of 45,000 feet.
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