Hi Scott,

Man, you have opened up one of the master debates. There are many threads on this topic on RCU. I would encourage you to research them for peace of mind. Also, ask those with experience using both. Let me help you in that I too just had the same question recently. Here is what I learned. Note, this was my first gas project as well, so I can only pass on to you what I have observed and learned from those with more experience than me.

Many will tell you that PCM is not a cure all for interference. Their position is that PCM can mask a potential problem that otherwise would be found with PPM. Many will suggest that you test using PPM , correct interference noise, and then use PCM for added filtering. Have also learned that many are not comfortable with the fail safe function feature with PCM. Personally I think it makes good sense. IMHO.

Couple of other things I learned in my first gas project. Some will say to definitely use PCM on gas and then others are comfortable using PPM on gas engines. Antenna outside vs inside. Keep receiver at least 16 to 18 inches away from ignition source. Keep servo extensions and any other potential interference items well away from receiver. Do extensive long range range checks with engine running and off from different angles. Of course no metal to metal contact. Many discourage using a metal throttle control rod. Use a plug with a noise resistor.

What did I do? I used a PCM receiver and programmed fail safe to idle the throttle and get the airplane down quickly. IMHO I don't think there is a perfect answer to this debate.

Now for your decision. Good luck.