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About RFguy

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  • Birthday 27/12/1970


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  1. Hi Bruce a litre of oil through the rocker COMPARTMENT per minute can pull about 500W out, which is about 1/2 idle dissipation. That would fix getting hot sitting on the apron. it might be useful to cool valve stems also, but I am unsure of the effect of having flooded rockers area with no valve guide seals. However it wouldnt be under pressure, , just overflow into a can and then back into the cracnkcase. The axial blowers are quite effective. 120CFM into 3" of water !!! only 3" diameter but they'd need to be mounted in a place not too hot and some scat into the rear of the plen
  2. when I started my rebuilt, I cranked it with the starter for about 15 seconds (without plugs in) . saw oil pressure rise into green. then did it again 2 minutes later. started first revolution with plugs in , no clattering. (The engine was bathed in oil everywhere prior to that) . but, Nev that is a good point about external pressurization. before a piston moves. of course, in my case main bearings etc still had oil because the crank etc and big ends had not been touched. my mazda mx5 (1998) , run on synthetic oil. When the oil got > 3000km old, the engine
  3. in my recent hydra lifter experience, the air may be bled out of them quickly with cam high. the air is quite compressible. You can compress a lifter full of air down to spring bind with your finger. - Not the same as getting full of oil. the ingress of oil , which will occur quickly, will compress the air, and may go out with the bled down. If there is piston/valve clearance I cannot forsee any harm if it sorts itself out on the first few revs on start. might make a bit of noise. I don't know what spring pressure Rotax's run , yet. but- The Jab
  4. really depends what they set out to do. The chinese can make good stuff if they really want to . sometimes brands are established (where the reputation matters) and once a company has a good reputation, they can let the quality go a bit. Goes for all fields. We'll see how my cooling solutions go for my Jab. I have a couple of axial compressor-blowers to install , will pump that in at the far end of the cooling plenums. Maybe oil flood flow the rocker compartments etc.
  5. does anyone keep their receipts for 500 hours? they evaporate/fade unless sealed in a plastic bag.
  6. The 'new' lightweight 89kg O200-D is another option in that power range. (although water cooled engine solves many cowling, ducting difficulties) ....similar money to an 100hp rotax. clutch on rotax is the plus if you have a prop strike. that's a worthy feature if you need to land in paddock. I can understand Kasper's comment if he had a rotax throw a crankshaft. Yes, one of very few, to be sure.
  7. I wonder if the ZS engine is a physical copy (at least in dimensions, dunno about materials), or is a undisclosed Rotax license ? That's also possible. If anyone is interested : http://en.zsaeroengine.com/ Superior engines are a similar comparison. Though one could argue the Lycoming design is long older than the Rotax. (in terms of what is fair game) . I wonder if the Brumbys that are sold into China use them. I will ask. The new Australian Brumbys certainly have genuine Rotax . (I see them).
  8. field report - Time required to change 4 o-rings is approx 2 hours for someone who has done one, and or is well familiar, or 3 hours otherwise.
  9. IBob I'm no proponent of any war. actually I'm more concerned the very fancy silicon chips I use that come out of Taiwan would be interrupted, and I'd rather there wasn't a conflict, it would be bad for business... Kasper, your 912... was it one of the generation that fretted crankcases?
  10. While looking for a ring mount 2nd hand for a non Jabiru project, I have been reading about their (Zongshen) engines in Drones, and ZS seems to have some of their market and are reliable. the C100 (clone of the 24 year old rotax 912ULS) is about 16.5 grand aussie inc freight , + GST. That puts it at 62% of the rotax price. HOWEVER - Parts (ancillaries like ring mounts, exhaust systems etc) they're about 1/2 of rotax price. The $64 question is a) do you have concerns over interlectual property theft. I think the engine is fair game after this long. However, a reas
  11. agreed. it is sad. although the AM radios could add GPS position with every start or end of transmission. doesnt have to be FM . the could just have used DTMF (touch tones) to wake up a pilot. FM would require a new channel plan. which could be interleaved between active channels. etc etc (this is regularly done in comms) . AM provides for some workability if two stations transmit simultaneously, but not much if the frequency spacing is more than a few hundred Hz and the radio of signals is more than 10dB. in some ways, they should have gone SSB.
  12. if they're trying to identify "unidentified VFR" etc etc, they dont know the callsign, they're just seeing 1200, little chance of (ground) trouble. Now, start bellowing out your callsign with ADS-B , and not listening to the radio, that might get you a citation. The radio/antenna faulty excuse will probably get you out of trouble 2 times, that's all. Dual radios doesnt help, they're usually on different freqs.
  13. WHAT is missing and is really stupid in aviation, if I may say so myself is SELCALL to radios. IE your radio goes beep beep beep if it receives a specific code, entered by another radio user This SHOULD HAVE been mandated in radios 30 years ago. If couriers and mobile dispatch people in the 1970s can have it.... In that case, the ADSB-OUT that carries the ship's callsign would be used by ATC to alert the operator with a direct code sent to their radios. (Mode S has this facility) AND it could be sent out on 50 frequencies simultaneously
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