andywragg
Posts: 44
Joined: 1/17/2003
From: Sheffield, UNITED KINGDOM
Status: offline
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I have it on good authority that Wiz has flown his with an OS 61 FX and its no slouch with this motor. He's turning a graupner 11x8 prop and acheiving a grand rate of knots. Here's a cut and paste from our forum over this side of the pond.....
I would certainly use a separate pack for retracts if I were using retract servos - I'm using 13Kg metal geared "normal" servos which means you can set travel etc. very accurately so I'm not overly concerned.
Weeeeellll ....Maiden was this morning! Got down to the patch to find that not only had the grass not been cut too much this week but also the strip was littered with sheep's pooh! Not good for 2.5" wheels but, undeterred, I fuelled her up and the OS61FX which has been moth-balled for 5 years sprang into life on the first flick, after a manual prime. The range check was fine and I could no longer find a reason not to commit aviation - or at least try!
I'm running with a Graupner 11x8 prop and as I mentioned before, I was a little concerned that the .61 might not have enough ooomph. With 11600 on the tacho, there was plenty of urge so out to the pooh-laden strip ...
Opened her up and away she went ...even on the rough ground she was soon in the air. First thing I noticed was that she does have a propensity to put her nose in the air a bit too easily so I dialled-in 5 or 6 clicks of down and she was straight & level at half-throttle. Not bad at all ...
No worries about the power - oodles of it - I really don't think you'd need much more - high speed low pass and it's rapid, very rapid!
I put her up into a lovely big loop - when I realised the cloud base was a lot lower than I thought! I lost sight of her ...but I remember my old instructor telling me that unless I'd done something different, the model was probably going where I last saw it so I held on the elevator, reduced the power ...and she re-emerged from the gloom! Phew!
The roles are lovely, reversals, half cubans ...are awesome ...and now for an approach, see how she slows down ...and ...errr she doesn't! On the 4th go-around, I reduced the idle speed even more and tried a "high alpha" approach which worked better but she still came down fast!
The nose leg failed - well, not really failed as such - the T-bar locking mechanism had jumped out of it's guides but I put it back in - I think it'll be fine but I could probably do with a new nose retract. We do have a fairly short strip though and, with the longish grass and sheep's pooh, I think I did rather well!
All in all - big grin factor
So there you have it. Yo dont need a massive motor to make this bird sing. We do try and keep things as light as possible over here. Sticking a massive engine on an airframe designed for a certain power plant not only increases the AUW of the airframe (due to the engine and the ballast needed to balance the airframe) but also increases the drag.
I will be attending one of the UK's better shows this weekend and will be picking up a keecat whilst I'm there. Personally I cant wait to get to get one built.
'I feel the need, the need for speed.'
Oh dear I think I've come down with a dose of unclesamism. Where's my bottle of ale and union jack shorts?
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All Forums >> RC Airplanes >> Extreme Speed Prop Planes >> RE: rich model keecat.60 size kingcat with retracts 
RE: rich model keecat.60 size kingcat with retracts - 
