Wren MW54 Turbo Prop Accel/Decel tuning results

Most model turbines are shipped with their FADEC (ECU) programmed for conservative running parameters intended for best reliability. There are occasions when these parameters need 'tweaking' to best fit a particular application. Here is one particular situation, a propeller is being spun and a sharper response to throttle requests is desired.

There's two key FADEC parameters available to adjust: Accel and Decel.

Accel controls the rate of fuel pump delivery increase and if too quick can cause the turbine wheel and combustion chamber parts to overheat.. The air flow through the turbine has to keep up with the added fuel is the internal temperatures are to stay within safe limits. Is presently set at 15 and have not witnessed any serious spikes in EGT.

Decel does the opposite - controls the rate that fuel delivery is removed. Too quick a slowing rate will force a lean mixture and a flameout. The turbine must be allowed to physically slow at a careful rate so the mixture stays within a given combustible range. It's now at 25 and works well. Was 20 and would randomly lose fire when at that value.

Category:

Science & Technology

Tags:

• turbine engine
• power
• measurement
• horse power
• wrenmodel jet
• wm54
• performance
• RC
• radio control

[StormyMaxPerry]

@n7hww

"I" won't be using it on any airframe. It's not my engine but was doing tests on it for a friend. This turbine will be integrated into some non-flying devices.The equivalent gas engine is roughly 100cc, around 8HP. As a matter of fact, that 28/10 prop is off my 3W 106cc twin cylinder engine.

[n7hww]

What airframe are you going to use? What size gas engine is this equal to?