jetboy

The RPN app I have on android is called HP41C, because I cant easily use the ones that are not RPN I still use the only calculator I've bought - HP21 and it took me 2 weeks to learn how to use - well worth it though Wished I could have stretched to the HP25 because it had the moon landing program built in Now back to the astronauts - I doubt they had calculators in their pockets - the HP41 came 10 years later? http://www.hp41.org/Intro.cfm maybe referring to the AGC (Apollo Guidance Computer)? Would a compass even operate on the moon?

The probe should be to the halfway of the pipe, so pack it out with a sleeve if its going too far, the small dia. exhausts we use sometimes need weldments fitted to do this. An over large probe will do more harm than good obstructing the flow and burning up before its time I hope you have 2 probes for a 582 i use just 1 for the Jabiru but its only for verifying the carb operating conditions thinking back this probe placement stuff is a black art my LAME decided to install my 1 (FAA PMA approved) probe on the C150 after the 'Y' on one side of the engine - against the instruments documentation - saying it was better to watch 2 pots rather than the one specified. The application is slightly different because its not reading an absolute temperature - just the drop in EGT for leaning purposes

The head bolt check after first engine run is done by Jabiru in the factory. If it was an overhauled engine and test flown on the plane, then the clause about head bolt checks after first flight would apply. The next check is called for after 5 hours run by the customer, which the engine has not got to yet.

The common advice years ago was that paper elements in open type microlights will clog with waxes found in the fuel - in a car not an issue but when fuel is colder it happens On the Bantams i ran the choice was one of the OMC inline plastic filters from the marine supplies These have a plastic mesh inside - not paper. For the 701 the plans call for a gascolator I got the ACS one although the mesh is not the usual cylinder type like in certified aircraft just a flat circular mesh. Its been perfectly clean and running for 12 years - with a tubing replacement at about 6yrs. normally use avgas at the pumps but if gerry fueling I use Mr Funnel. Andair make a better gascolator/filter for the discerning. The less kinks and joins in a fuel system the better. Heard so many bad stories about the inline filters which can be dissasembled - air bubbles leaking in, self dismantling during flight etc. they sounded like a good idea Ralph

one aspect in the video about CASA not knowing what was wrong with any of the engines..... and that they state that these engines are under LSA rules, not the average light aircraft or homebuilt certification rules -therefore the responsibility of Jabiru to find the cause and issue any modifications to make the engines OK again......and Jabiru hasnt told them what the problems are so they are still sitting on it .... 14 months on ... I thought that was a very misleading statement to be made Wouldnt the majority of Jab engines and aircraft sold and operating in Aus be made to the design rules systems in place before ASTM and LSA was introduced ? Do you have a registration category specifying ASTM compliance? In NZ I dont think there are any aircraft or engines on the register operating under LSA requirements. They might well be compliant, but to be registered as a microlight or GA aircraft they must meet one of the other design rules already in existence. LSA is irrelevant. Ralph

I have a 2200 and replaced the exhaust valves at 300 hrs as a precaution - the leakdowns showed 2 cyls with slight exh. port seepage in addition to the usual crankcase blowby. The valves were OK - some pitting on the contact faces which could have been ground out but its easier to pop new ones in. more importantly the usual catastrophic failure seems to be at the stem necks many reports of fine radial cracking in that area esp. with lean running So when I needed to pull the heads again at 500 hrs to correct the rings blowby I replaced the exh. valves once more- with Camit sourced ones as per the 2200 original build type. There was nothing wrong with the valves its just more risky to leave them in if the heads are coming off anyway. Also noted that daily pullthrough can be variable and ofte - like last week - poor results on 3 cyls but after a couple of hours checked today and its all normal. like leakdown results you need at least a second flight to recheck before strippng it down.

I made some LED replacements for Halogen /Xenon lamps previously used. The holder is a diecast unit from a local lighting manufacturer The LED modules are 9W for electric scooters they are made with 3 of 3 watt LED with a series resistor to run from 12 Volt source. Its important to add another wirewound resistor to drop the 14.8 volts from Jab charging system to 12.0 Volt for these units as they are sized for electric scooters which are run on the discharge only of a nominal 12V battery Everyone reports they are bright and because there is no switching regulator involved there is no radio noise.

What colour is your avgas? We been told by our CAA (NZ) that its changing to blue (100LL) here in January. Funny that none of the fuel suppliers are listing any change from the 100/130 grade that has been supplied here for the last 30 years. A bit less lead should be better for Rotax and Jabirus, but it amazes me how we are told the 100/130 is essential for some operators and therefore the only grade supplied - yet clearly 100LL will do. I remember back in the 70's when red 80 was phased out and replaced with 100LL the training A/C were carking it at the runup area and being sent back to maint for a plug clean - until we got taught to burn them off with mixture Ralph

Ironically, this was the last of 3 inflight engine failures in as many months. I heard the maydays for the first 2. It was not intending to land there. The failure causes were never proved, just suspected as carb ice. a few planes have been retrofitted with extra intake heaters - electric or coolant operated - since. Gotta love those reliable R912 installations. Especially the factory built versions with the flimsy or non existent carb heat systems. If it were a homebuilt i.e. "amateur built category" it would have been required to meet the FAR rules for carb heat air intake temperature rise before being let loose on the unsuspecting public

Marty, it was the harness supplied by CZAW, there is anchor points part no 7-FO-4-2CZ for the shoulder straps in the aft of of the extended baggage compartment. CZAW certified their 701 to European BCAR 'S' they added doublers and increased rivet lines for these attachments. This change was adopted by Zenair in a later revision. Ralph

i'm 1.76 so have quite a lot of room to spare. Headset with band behind helps too

The 701 cabin is OK for Chris H and he is tall but i suspect the one you sat in had too much fat seating installed. mines prfectly comfy with just 1" fire retardant foam and quilted sheepskin patchwork car seat covers from Supercheap autos on top. I've seen some with just the thin leather car seat covers, on long trips he'd stuff a coat or sleeping bag underneath. the trouble with doing a beanie mod the diagonal bar across the roof would need to remain unfortunately is the wrong orientation for someone occupying the left seat - I guess extra tall people could fly from the pax side Sav or Hornet are the nearest equivalent aircraft

Nah,......the Martian Jet pac only goes for 45 minutes ......and its the only jet I know of which isnt actually a jet

Is air cleaner same type? I used to use the K&N dual air cleaner I liked better than foam pod filters EGTs showing normal? Float needle valves get old but you should have new ones with the new carbs Other than intake leaks or crankcase seals that leaves the muffler I liked the 503 for its simplicity and never had that sort of variation on either of them. Ralph

looked thru the videos http://www.ski-doo.com/ca/technologies/engine-technologies/2-strokes it would need to be much more reliable than the 618 to be of any use for aircraft The 503 was probably the most reliable 2 stroke they made but that didnt stop mine grenading in flight oiling system is a significant improvement, as is the elimination of rotary intake slide valving There is a smaller version 600E - wonder if the output shaft is the same fitting to the 582 gearbox? There is a long list of similar prospects Simonini Victor2, Hirth 3701, Konig MZ301i, AMW A808FI Diamond GIAE110R, Diamond IAE75R I have yet to hear of any that have been sucessful

Bruce, with an approach like that, aren't ewe cutting it a bit fine?

I'm not sure that you actually have a half-wave dipole in there. It would need to be around 48". There are some designs which are in the form of a folded unipole, or an end- fed vertical often referred to as a J-pole Most times a standard quarter wave whip (24") with some form of groundplane - 3 or 4 metal tape strips glued inside and 20" long each would do. looking at your lovely photo I can see another possibility. If your stall fences are ali and the upper rear end is not in contact with any metal, you may be able to connect your coax cable braid to either the mid point of the leading edge inner curve and the coax inner connection to the lower tip of the fence - on the inside radius. Or you may need to slide the braid further round the upper fence to get a match. Technically this would be called a low profile antenna or train antenna. If your fences are plywood its actually even easier you can glue a wire around the outside of the fence, cutting the dimensions to suit the frequency. Sorry for the technical bits and you'd need some test gear to get these to work. A store bought quarter wave whip with groundplane strips works 98% of the time, and keeps the signal above & outside the fuselage both radiating and receiving wise. I worked on turbine aircraft where mounting antennas too close to the cockpit & engine caused trouble with instrumentation and headsets. Ralph

and there was the Simonini for a while - one in a Zenair 701 at Rangiora which i'd like to find more about. I think it got swapped out for a Rotax 912. likewise the small Wankels, all of which are unobtanium around these parts. Diamond AE50R / AE75R is the last heard of. A gear drive 75hp would do for my application. I used to run 503 in Bantams and liked them (except for the grenade episode)

I learnt in the 70s at a controlled airport and for some reason was only taught oval circuits despite having about 6 instructors at that club. CFI was ex-RNZAF and one of the juniors ex-RAAF maybe that had something to do with it. I first learnt there was a different way about 2 years on when competing in our national competitions at Invercargill Happily I came in 2nd for that competition however I pretty much always fly the oval pattern I think its far safer for a number of reasons particularly our microlight circuits are usually tight and at 500' pattern here. I wouldnt feel safe doing sq ccts with the Jabiru. maybe CASA should mandate the oval pattern in this circumstance

I learnt in the 70s at a controlled airport and for some reason was only taught oval circuits despite having about 6 instructors at that club. CFI was ex-RNZAF and one of the juniors ex-RAAF maybe that had something to do with it. I first learnt there was a different way about 2 years on when competing in our national competitions at Invercargill Happily I came in 2nd for that competition however I pretty much always fly the oval pattern I think its far safer for a number of reasons particularly our microlight circuits are usually tight and at 500' pattern here. I wouldnt feel safe doing sq ccts with the Jabiru. maybe CASA should mandate the oval pattern in this circumstance

told to me by a kiwi working for JPL at Tidbinbilla tracking station: Did you know we've found rings on uranus? .....no i havent looked lately

told to me by a kiwi working for JPL at Tidbinbilla tracking station: Did you know we've found rings on uranus? .....no i havent looked lately

While perusing the 2200 and 3300 engines pictured on Jabirus website, I noticed the oil filters are not Ryco ones Because of the Australian recall of Z386 filters a few years back, I've been using Repco filters instead. So what are the new OEM oil filters used by Jabiru?

I think that glass of whatever resembles the result of 60 minutes of stock grazing on Swede / Chowmolea? (forgotten what it is called nowdays) and fresh clover. Ah the memories of doing the rounds at night checking on 40 or so yearlings Aberdeen Angus hard to spot buggers and having to burp unlucky ones with a hose. We did try Swede to eat but I think the recipe is similar to our Pukeko stew where u get a couple of medium rocks throw into pot with Pukeko and simmer for 2 days, throw out the Pukeko and its done.

I've wired 5 cht probes to one gauge but you have to be specific about this depends on the type of gauge is it floating - with respect to airframe electrically? or are the probes floating (electrically insulated)? is the gauge powered / amplified or energised directly by the current from the thermocouple? The switch must select both wires - from each of the probes The switch must be a suitable low resistance type if the non-powered gauge type is used. Seeing its a Jabiru we are talking about, dont have to worry too much about the cold junction, or the accuracy of the probes