Tony Sir, the bicycle spoke/nipple combination lasts for years.. only thing that we have to do is, that to apply coconut oil, just before the RCying, in to the oiling point, and must wash the craft with fresh water after RCying as my lake is situated near to sea,(salt water), and after drying, we must drops the 2T engine oil, in oiling point, and just at the gland of motor.. lasts years.. all of my crafts still working fine, and after years of RCying, the only thing that we have to replace are the nipples and the spoke itself.. costs about half a Dollar.. !!.. one of the great advantage of hand made aluminum/brass props is, can alter the blade pitch according to motor/battery ratings.. gives maximum performance all the while.. long running time..
the siren is based on a simple circuit, that i completed on a piece of a thick paper.. can make within some minutes.. will add the circuit.. it is capable of making lots of variation from gun shot to ambulance as we alters the two presets with a screw driver.. the siren was switched by a 9 gram servo.. circuit follows..
thank you all for the great inspiration.. HAPPY NEW YEAR ALL..