John Minchell Posted April 11, 2021 Share Posted April 11, 2021 I have a 72" span Maxim model which used to fly with a 20cc fourstroke glow motor - YS / Yamada or something. I aquired the model without servos or motor. I wanted to put a spare ST2500 in it but with 6x standard 60g servos and a motor weight of 1.2kg it will put the OA weight to 5.3/5.35kg which is over the limit for your UKCAA competitions. Does anyone know the weight of say a 120 ASP or SC or some such similar 20cc 2 stroke motor (with and without silencer) which I can get hold of easily (money is tight too, so likely second hand) and with some 30g servos I can squeak under the 5kg limit? TIA John M Quote Link to comment Share on other sites More sharing options...
Don Fry Posted April 11, 2021 Share Posted April 11, 2021 (edited) Asp 120 AR weighs in at 935 grams. Nice motor,I have one in a hack. Hobbyking corona servos are good. Their High Voltage units punch well above weight. 935 is with silence, 850 without Edited April 11, 2021 by Don Fry Quote Link to comment Share on other sites More sharing options...
John Minchell Posted April 11, 2021 Author Share Posted April 11, 2021 Thanks Don - gives me something to go on. What size & pitch prop does the ASP 120 turn? John M Quote Link to comment Share on other sites More sharing options...
Don Fry Posted April 11, 2021 Share Posted April 11, 2021 It’s in a ARTF 90 size Stick. Weight is about 4.5 kilos. It looks like I’ve got an APC 16 x 8 fitted, can’t be absolutely sure without taking the spinner off, The airframe came to me second hand. It had previously been fitted with a Supre Tigre 2500, what was a constant pain to the previous owner, so I sold him the ASP to get some reliability. It has a lot more authority with the ASP. Unlimited loop size, constant speed. Are you planning to fit as is, or on a pipe? Quote Link to comment Share on other sites More sharing options...
Don Fry Posted April 11, 2021 Share Posted April 11, 2021 Just dug a 16#8 APC out of the spares box. That is what’s on the motor. Quote Link to comment Share on other sites More sharing options...
John Minchell Posted April 11, 2021 Author Share Posted April 11, 2021 Thanks Don - dunno what I'll do yet, it depends on what motor I can find at the right price etc. As I say I have a brand new in box Super Tigre 2500,but it's way too heavy. As long as a good 120 or 108 2T will fly the model, then hopefully I can find something cheap but a good runner. Quote Link to comment Share on other sites More sharing options...
Don Fry Posted April 14, 2021 Share Posted April 14, 2021 Did you just buy a ASP 120 AR on E bay. A decent looking example just went through for stupid money, just over £30 plus post. That is a lot of power per pound. Quote Link to comment Share on other sites More sharing options...
John Minchell Posted April 14, 2021 Author Share Posted April 14, 2021 Hi Don - no it wasn't me, but I have a good mate who is sending me a new, unrun ASP 120 with silencer for £50. I thought that was more sensible than a used and possibly abused engine from ebay. Thanks for your help. John Quote Link to comment Share on other sites More sharing options...
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