danny_galaga
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You have to remember that it is also air cooled, so I don't mind all the extra vents. Should be good for low speed trundling around. Right now the cruise is 65knts! With new propeller hopefully closer to 80.
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First off, my boy is a HE 😄 Yes, its from Sert Efrika so I guess they were allowing for high temperature summers. IN winter, just tape off some radiator. I experimented with both, but found the oil cooling reacts quite differently to the water cooling. So I've left the oil coolers alone and right now the radiator is about 25% taped off. Regards the stall speed. Definitely a disappointment before I even received the kit. While it was still in transit it had an AD issued because of the high stall speed. So I had to build the plane knowing a whole new empennage was coming, which took them 18 months or something to design and manufacture. Extremely unsatisfying. Anyway, the stall is now 39knts with flaps, down from 45 or something ridiculous. Not brilliant for a 'bush' plane. Mind you, in my first test flight with my test flying guy, we got it quite a bit lower than 39knts, but best to assume 39 and be safe than push it to its limits I say.
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As Juan says, it seems to get the experienced pilots more. I guess not just over confidence but since they are the ones that operate low the most. If you don't need to be that low, don't be is the message. -
I bought a kit, not based on 'oh, this has one too many oil coolers in it', but rather on it looking like it would be a fun plane to build. Any technical questions, you will really have to ask them. It is a Skyreach Bushcat. There are many KISS principles at play in this design, for instance TRIM and FLAPS are totally mechanical, not electric. No auto pilot. I selected a carby engine. And a single piece wooden propeller (although it turned out to be the wrong pitch, so maybe SOME complexity, ie ground adjustable, could have been handy) If one wanted to totally keep to the KISS principle, one would buy a hang glider. Attached, a good frontal picture of someones Bushcat, for your edification. Visible are the radiator, above it the first oil cooler and above the spinner the second oil cooler 😇
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Yeah, it's a funky design. Instead of one larger oil cooler, theres two smaller ones. The top one is in and out, which i.guess has the advantage of none of that hot air going over the engine. More likely it's designed that way to make the engine cowl quite a tight fitting affair. Witness for instance where oil coolers end up on WW2 aircraft 😇
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My top oil cooler is mounted with these on the top of the engine. The bottom oil cooler and the radiator are just mounted directly to the bottom cowl.
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Started a spare parts list
danny_galaga replied to danny_galaga's topic in Aircraft General Discussion
Tough call 🤔 -
Yes OS is probably still the most popular
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No. But many engines (like my own childhood engine) hardly got any run time on them before being jammed in the back of a drawer. So quite a few near new ones pop up. They are popular for stunt because there's a certain speed you need to fly, any improvements on power are wasted in this case. There's a few Ruskie and Ukrainian engines around too.
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A number of guys are running Fox 35s at the club 🙂
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Id say you should email them, but they've gone broke in the meantime 😄
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From the build manual. Doesn't look like that big a deal to me. And I still don't understand what YOU don't understand about having different radiators for aircraft with different performances. Its as if you couldn't see that maybe a radiator from a F1 car might not perform exactly the same in a LandCruiser 😇
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The port size is 22mm, not as small as you are probably imagining
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It's much the same size in the similarly performing zenith and savannah 701. What's your theory then, since the radiators are roughly the same price? Seems to me a slow aircraft could do with a larger radiator. Maybe you ought to write to the bush plane manufacturers and tell them they've been doing it all wrong 😇
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I reckon maybe that one is for general low wing plane use, and slow draggy planes like mine are best off with something a bit different
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