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Old 12-12-2003 | 08:26 PM
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Kevin Greene
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From: Jackson, TN
Default RE: JPO assess speed limiter implementaton issues?

Religion---Politics??? I would be looking for the ejection seat handle---And not for myself... Since it doesn't have one I guess I would just go to the back and talk to the female flight attendants!!![8D]

John...At least we agree that this hobby needs to be fun!!! I have to respectfully disagree with you that the JetCat speed limiter does work as advertised. The JetCat unit reduces the thrust of the turbine in a controlled manner (unlike the other unit) when the pre-set limit is reached. It wasn't designed to keep the airframe to an absolute top speed or to prevent a pilot from deliberately exceeding VNE in a dive. Since it is pitot based it wasn't intended to limit the speed as read from the ground, nor able to compensate for a headwind/tailwind. If you wanted to limit the airframe to a true 200 MPH airspeed as measured from the ground then you would have to ask to speed limiter to do more work---Deploy speedbrakes for an example....Not to mention having it possibly tied to a GPS system.

The JetCat unit works well and follows the KISS principle. Asking it to do more as in maintaining a true airspeed as measured from the ground or to deploy speedbrakes defies the KISS principle, not to mention the high price you would pay for an elaborate unit like this. The pilot is ultimately responsible for the speed the model achieves....When flying a turbine powered model and it "knocks" on the speed limiter, I have the responsibility and maturity to back off on the throttle....Not to just let the model continue to exceed the VNE. Again, this all points to us regulating ourselves which most of us seem to be adequately doing. Just my .02....

Kevin