George1

Daithi, that is true, but it's one thing to be in an aeroplane, and another to be flying a model at what seems more than a good airspeed, and is so up to the point of seeing a wing dip. What I am looking for is an airspeed detector and controller, not a stall warning or an AOA device.. While groundspeed seems more than adequate to the model flyer, airspeed can decay to the point that AOA goes critical, and airspeed can decay so very rapidly. Assuming level flight, at low altitude it is too late to push down elevator. The idea is to have the throttle open well before AOA goes critical, airspeed increases, all is fine. Once through the disturbance, the throttle reduces back to the ideal speed. From the above it could be assumed that there may be airspeed hunting, I don't know, case of try it and see. Telemetry can send airspeed back to the flyer, but for mine he should be watching the plane, not a screen, and there is a time delay. I have seen so many models go in, the flyer is left with a puzzled mind, the gear checks out and it is put down to dumb thumbs or interference. There may be another cause.

BEB, Well, I don't dispute the point. What you are saying is that a stall can happen at any airspeed. In certain cases the AOA can increase in level flight without elevator input, and it seems to me that an airspeed device would detect a decrease in air speed and open the throttle well before the stall approaches. That is, before the AOA becomes critical. Assuming that as the AOA increases, the change in angle of airflow on the pitot will lower pressure, and indicate a decrease in airspeed. So that airspeed is an indicator of an increasing AOA = approaching stall. With a glider for instance, the answer is to put in down elevator. Easy. Different aircraft stall at different AOA, so the idea is not a panacea for the casual flyer. Or maybe anyone. Possibly the whole concept is invalid, but until it is tried out, we will never know.

Thank you for contributing, but what we are looking for is an airspeed control system, irrespective of whether we know how to fly an aeroplane or know how to use the throttle. The idea is not to fly about just above the stall, but to have a throttle over-ride in case the stall condition approaches. A pilot is completely unable to accurately anticipate airflow and angle of attack in disturbed conditions, on occasions many get it wrong. Hence a device to open and close the throttle. Why shouldn't a scale model have a bit of auto control?

Now I know that there is interest in helping with a problem that many flyers don't seem to want to know about. Cyclicscooby, to me PIC means "Pilot in Charge" maybe you could explain why we need a rear facing pitot, this is all a bit new to me. Wingman, there is a system available here but includes all the telemetry modules, which I agree doesn't help much in real terms. But even at this price, if it saves a model worth $4,000 it is cheap enough. The trouble is, trying to get info out of them is like drawing hen's teeth. More detail about the speed control is mentioned in the PDF User manual, which can be downloaded. Edited to correct link.... Edited By Steve Hargreaves - Moderator on 11/03/2012 07:14:50

G'Day, Does anyone have information regarding a sensor and throttle control unit to enable setting an airspeed just above stall, ( point found by experience). It is fine to tear around to keep away from the stall, but.... No telemetry wanted, unless comes with the airspeed unit. Set off for takeoff, on for scale speed flying and approach, off at touchdown to allow stall. Many aircraft get into stall flying over trees and I feel that it is an airspeed problem, which of course the pilot can not see until too late. Can not blame dumb thumbs or radio. Any ideas? George.