First test:
talk about Bluebird first, as also edf powered.
Tried out on 2s Lipo and went really well. The 64mm edf producing great amounts of whoosh, surpassing expectations actually (on 2s). Not too much water splashed about. The sound of the edf was to die for, exactly the right high pitched whistle/woosh sound. Turning slowly around at the far side of the pond, the sound and the water being kicked up by the jet was simply captivating. It looked for all the world like the Coniston videos. Pushing the throttle forward the boat zoomed towards us nice and flat (battery well forward) andattained a good planing speed.
Recovering the boat and fitting the 3s battery I motored out and all of a sudden the boat took a nose dive. I thought perhaps I twitched the throttle or something, and continued. It was apparent the boat was not going as well despite the increase on power and whilst limping back, conked out. Back on shore it was full of water and in retrospect I think it hit one of the huge carp wot are in the pond mating, and hence the nosedive.in hindsight I should have bought it straight back, but there we are. I had forgotten to put the internal cover in place that may have prevented that, but simply forgot as the boat has sat on the shelf for at least 2 months or more.
After drying my tears I put the 2s in the Cobb. First off it is obvious that the smaller 50mm unit produces much less thrust than the 64mm one, despite the not too dissimilar claims on the specs, although these figures are for 3s operation. Anyway, motored out to find it would hardly steer, it would go right, a bit, but not left. This of course bears out other bods build experiences. I also noted that it was steering opposite to stick commands?. So switched the right stick over so the rudder went over to the last on right stick etc, and lowered the rudder. This made the thing steer although not very well. I opened the throttle but it was very sluggish. The nose stayed up ok (an issue with other modelsseems to have been difficulty in getting the nose to rise) but there was insufficient thrust to get the back op. It wallowed and then conked out, water everywhere.
The Bluebird will fly exactly as planned with a 3s in mid position and the internal cover in place, I have no doubts.
The Cobb is going to need full power to rise up and sit on the sponsons and that’s just going to have to be a leap of faith. Shut eyes and whack the throttle open. It does not help that the cabin is a mess of wires as I don’t know where everything needs to be until it performs properly and this is I am sure impeding air into the fan.
it may be that my decision to use the smaller 50mm unit will bite me in the arse regarding available power?
As I see it,the way forward is to tuck everything in with the 3s and try and waterproof the esc and receiver with plastic bags (temporary, obviously I can’t keep the esc wrapped v
If it won’t rise on full power I will be a bit perplexed, but the other Cobb I saw on the pond belonging to Iain also took ages to plane.
Ashley
Edited By ashley needham on 16/07/2020 11:26:41
Edited By ashley needham on 16/07/2020 11:28:21