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JG3

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About JG3

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  • Aircraft
    Savannah
  • Location
    SE Qld
  • Country
    Australia

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  1. JG3

    912 Uls

    That's completely normal. Mag checks should always be done at 3000rpm or higher.
  2. JG3

    Better tank vent

    Noticed this neat tank vent mod on Charles Mollison's Savannah. Those original dangling tubes from the tank vents are a problem sometimes. If one gets facing forward and the other to the rear and tanks are full, the rear facing tube can start pissing fuel and keep pissing. This neat cable clamp pins the tube down and keeps it facing forward. Just be VERY careful drilling that rivet hole, all too easy to drill into the tank....
  3. Back in about 1997 I was flying my ultralight in the Northern Territory and accidentally triggered the PLB while in the air. It was a surplus RAAF 121.5 unit with no GPS, but had a test switch with no cover so was easy to bump on. I didn't realize it was transmitting for about half an hour until I noticed static on the VHF, switched to 121.5 and the signal blasted in, so switched off right away. An hour later landed at Brunette Downs Station. An hour later the station got a call asking if anyone there could have accidentally actuated a PLB. Now that's very impressive, seeing as how they first
  4. Has anyone here tried this plastic bag over a gum tree to see how much water you can actually catch? Not much I'm guessing, probably not worth the effort...... Always carry at least 5 litres of water in a hydration pack that can survive impact, and of course a good EPIRB. Trigger the EPIRB and shelter in the shade of the aircraft and stay there and move as little as possible. Keep a small fire going, with a bundle of grass and green leaves handy that can be dumped on the fire to make smoke when a search aircraft is heard. If the radio is still working call on 121.5 and 126.
  5. First of all I'm not an expert painter by any standard. Painted several cars and several aircraft, with variable results but mostly very satisfactory. Not trying to make 'show pony' standard, just good utility finish. Minimum weight and reasonable cost. If you want porcelain gloss finish then use 2-pack, with the down-side of more weight, higher cost, and difficult to touch-up in future. This is the paint that the local auto paint store carries, and I found it excellent. Painting aluminium. Over etch primer. Spray gun is an old, much-used Devilbis. Don't know th
  6. Just finished some painting with Protek Polyurethane 4:1. Excellent results and easy to spray, good finish. Costs $160 - $200 for 5 litre kit of paint and hardener depending upon colour.
  7. I used Solaguard on old perished skins and the result was really good. Looked like new and now protected somewhat from UV.
  8. The good quality exterior water based house paintss work well on Dacron fabric. Stick well and are very flexible. Clean the fabric first with spraying thinners. Sounds vicious but doesnt hurt the Dacron at all.
  9. I use the vertical compass already in my Garmin GPS when displaying the HSI page. Works really well and easy to read and not influenced by magnetic effects. Another benefit is that it shows actual track made good, compensating for drift. I use it nearly all the time.
  10. Could I please get some more info from you JG? Any recommended brand / type, mixing ratio etc. I want to paint the plane hopefully this summer. Probably white with blue trim. I don't have details about brands and ratio of hardener. I just go to a good paint shop that supplies the automotive respray market, and tell them what I need to do, and they should know the best combo. They tend to be experienced professionals as distinct from those that supply the domestic market.
  11. Automotive enamel with hardener added. Sticks well, covers well, light weight, good gloss with hardener, easy to touchup, low cost. Fairly impervious to fuel with hardener added.
  12. 1800hrs over 16 years. All recreational, no commercial training.
  13. That's not static; it's 5800rpm wide open throttle straight and level, just as Rotax recommended and their charts are based on. That puts me at 5200rpm at 60kts best climb, and 5100rpm for best cruise right at the top of the Rotax torque curve between 5000 and 5200rpm. Not pitched fine at all, just correct by Rotax recommendation. I found static to be not a consistent base line for props comparison due to cavitation and whatever effects at no airspeed, straight and level far more consistent. Fuel consumption at WOT straight and level is 26 litres/hr.
  14. JG3 you have a few errors ! TECHNICAL DATA FROM THE ROTAX BOOK max continuous performance : 69kW at 5500 RPM. fuel consumption at max continuous performance : 25 litres per hour. **** specific consumption at max continuous performance is 286g/kW/hour **** premium ULP caloric value ~ 46 MJ/kg, so translates to 13.15MJ/kW/hour, efficiency about 3600/13150 = ~ 27% probably +/- 7 % depending on how you value the weight of the fuel, the calorific value of that specific fuel etc Yes, I realize that Rotax publishes 25 litres/hr, but I do not get
  15. I do need to step in here and try once again to clear up some misunderstandings that are being tossed around. First of all, if an aircraft is pitched to 5500rpm wide open throttle (WOT) straight and level, then 5500 is no longer max continuous, not at all, it's now wide open throttle full power and is limited to 5 minutes! I guess I need to try to explain that.... The max continuous specification for an engine is not governed by the revs but rather by the amount of power being generated. That max continuous power is limited by the ability of the internals of the engine
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