Konx Hawkshaw Turboprop powered Thrush - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-01-2006, 09:04 AM   #11
I am: Boolean21
Join Date: Sep 2002
Location: Singapore

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Hi Ted
The Throttle response on a regular gas engine is, as you know, quite fast. In case you get too slow coming in to land, just increase the throttle, and you recover nicely.

In a Turboprop, the throttle response depends on how quickly the rpm on the gas generation section spins the wheel, which spins another wheel that drives the gearbox. In case you get too slow, it takes about 1 to 1 seconds for the prop rpm to pick-up and get you out of trouble.

Turbines accelerate very fast when they are above a certain rpm (each turbine is different).
By keeping the WREN turboprop gas section at 60,000 rpm, you can accelerate almost instantly as opposed to accelerating from 45,000 idle.

The other issue is that the propeller is freewheeling, which means delivers no thrust at idle and just above it. To get effective thrust, the rpm has to be up a bit. The reason it needs to free wheel is in case of a prop strike, the energy cannot be dissipated into the turbine or it will badly damage it. If the prop hits anything on landing, it will just stall and cause absolutely no damage.

What 2thelmt is referring to is to have someone with some Turboprop experience with Knox on his test flight to give him feedback because if you are focused on your flight, you tend to forget the above, especially on landing.

Hope this helps
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