Today my fellow club members and myself were examining a friends AX 40. We were puzzled by the three additional threaded holes in the head button retaining ring. These are in additional to the three holes for the head removal pin spanner tool.

Can anyone explain their function?

The three additional threaded holes are for installing M5 bolts to align the head and prevent it from loosening. Their installation is more crucial in the gas version of the 40 where the compression is much higher.

Have been reading of the gas version of the AX40 elsewhere, but this is the first reference I've seen of it on the NV site. Can you give further particulars concerning this new development? It has certainly a lot of interest to myself and others. Any information appreciated. Many Thanx, Mike Brennan

The gas 40 will be available this spring. If you have particular questions, please ask.

Thanx so much for the quick response. Have heard rpm figures for 10x7 prop @ 13,700, and that engine seems happy swinging larger props. Are any rpm figures available for 11" or 12" props? And is there any estimate of pricing for this unit? Thanx again for your time.

Mike Brennan

The best prop is 11x6, 13000 RPM. The introductory price will be $149.00