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Thank you for your reply, the motor is one of these -http://www.giantcod.co.uk/epower-2826-950kv-brushless-outrunner-motor-p-402705.html13 x 6" prop which I will try & may change to a 12 x 7", 55amp esc, separate bec & 4s 4000mah lipo.
On a 950kv motor you're going to be struggling for speed on 4S with any of those props. I'd be looking at a 10 x 10 as a starting point but thats probably going to make it hard to hand launch. In very round figures and only according to my experience a 6" pitch prop will give you the speed you need on 4S with a 1400 kv motor if you can find one that will deliver around 1kW for a full size gremlin.Tis a tricky one which has defeated those cleverer than me (but not as stubborn )with the 950kv motor i'd personally be looking at a 5S or 6S setup with a smaller prop to get the revs - but i'm really not at all an expert I just like to experiment really
I have changed the prop to a 12 x 8", I flew it at Osbournby not to long back at their fly in, I only used 40% of the battery as I was helping somebody trying to start a glow engine that didn't start I wouldn't say it was quick as all of the models, one had a west 50 with a pipe but I was pleased with the performance, it couldn't have been to bad as the oily boys didn't take the pi$$!With the higher pitch prop it does need to be well coaled up to get the climb.
can somebody help me make my files smaller so i can post them
Its covered with poly-c then painted with acrylic undercoat then rubbed down with 2000 wet and dry
Don't know much about watts/amps must be like 2 or 4 star So what's your verdict about the build and how it flies? When I drew up the 1st plan I used specialised calculations like.............. yer that looks about right the C of G was worked out mathematically though using IIRC Gordon Whiteheads formula in his book RC Scale Aircraft and it was right the 1st time.I keep messing about with the idea of making a scaled up version from Jabolite covering it in brown paper and fitting a petrol engine, may need a single retract on the nose to stop the big prop breaking.