I've had a number of potential customers speak to me because they think that there are problems with the 44s. I'd like to put it into perspective: there appear to be 3 people on this thread with problems and that is less than 1% of MW44 owners, so to the best of my knowledge 99% of MW44 owners are NOT having problems! The problems are all slightly different too, but I think it is worth re-posting some information from Mike Murphy which is already on the "Summertime Blues" thread.

"There is a definite link between climate and problems with the MW44s flaming out on acceleration. This is due to surge which is made worse by high ambient temperatures. Mike Murphy says that the remedy is to increase the acceleration delay to slow the rate of acceleration slightly. Without having a climatic test cell (and only Rolls Royce have one of those!) we can't anticipate what settings are going to be needed. We have had engines tested in warmer climates and David Gladwin has had no problems in Australia at 40 degrees C, but all engines are different and the smaller ones are more sensitive, so some will be affected more than others. All engines are tested thoroughly before they leave here and only the ones which perform well are sold, but we cannot tell how an individual engine will react to high ambient temperatures.

We have recently discovered that another cause of flameouts can be the position of the tailpipe. Two years ago we recommended 10mm from the end of the exhaust, but have discovered that with the higher-power 44s a larger gap of 25-30mm is needed. "

If you have problems, PLEASE speak directly to us straight away. I love the way that people on RCU help each other out, but the MW44 is different from the larger engines and solutions which apply to them don't always work on this tiny engine, so well-meant suggestions can sometimes make things worse. We are the experts - Mike designed the 44 and the team here are working with the engines all the time. We know it well enough to have been able to increase the thrust by an amazing 25% in the last few months ... please trust us to help you!

Sara Parish
Wren Turbines