pluessy

CASA is missing the main point: all aircraft in the same approx location MUST be on the same frequency. Listening to area is a total turn-off with the dribble from far away and high altitude aircraft making 99% of all transmissions. All I need to hear is who is doing what in a 30-50nm radius of my position.

[ATTACH=full]62004[/ATTACH] I hope you finished this installation and fitted some drip trays (heat shields) under the carburetors? What size are your oil lines? They look smaller than mine.

That's the whole problem wit this setup, there is no direct check. The only thing you can do is crank the engine with no load (spark plugs removed) until you have steady oil pressure. This way you at least know that the pump has been primed, and then hope for the best and keep an eye on the oil pressure gauge

Sorry, need to correct you here. The oil pump is fixed displacement, the only control over the volume you have is the engine rpm. You actually throw oil away when you lower the PRV pressure as a portion of the oil leaving the pump is now being returned to the pump inlet and does nothing to lubricate or cool the engine.

OK, defies logic. 45psi is 3 bar and that is well below the opening pressure of the PRV. Mine is on 4bar (5,000-5,200rpm) and changes ever so slightly with oil temp. I don't know what my relief pressure is, I have never revved the engine high enough with cold oil to see that pressure. One interesting fact with Rotax engines is that the running oil pressure actually increases with increasing oil temp. When I take off with 50deg C oil temp, the pressure is initially 3.6-3.7bar and then increases during climb to 4 bar when the oil temp reaches 80degC. This is a result of the diminishing suction line losses with decreasing viscosity, more than off-setting the increasing pressure loss in the post pump circuit.

The relief valve is supposed to stay shut to 5bar. If there are pressure fluctuations that happen below that pressure, then an oscillating relief valve is a symptom and not the cause. Changing the relief valve in this case most likely "fixed" the issue as it would have a very different harmonic frequency (different spring and different plunger mass). Jabiru has that problem with oscillating pressure relief valves when the PRV is activated (high oil pressures). The pressure spikes are splitting oil coolers! It doesn't happen at oil pressures below the relief valve setting.

To my knowledge, the oil is not affected in this application. The life of the oil is too short, 50-100h max compared to a hydraulic system (several thousands of hours). The most likely component(s) to cause cavitation (vapour) are also not oil components but fuel! When my oil temps wouldn't come up to 80-90deg C, I had over 2% of fuel dilution in the oil (most of the time it is under 1%). Cavitation is caused by a small part of the fluid experiencing a local pressure that is below the vapour point eg forming a tiny vapour bubble. Speeding up a pump that already struggles to get enough fluid supplied is not the fix. The usual remedy is the reduce the suction loss (reduce pipe length, increase dia and replace/remove fittings with low-loss versions). If that is not possible, increase the source pressure (elevated reservoir or pressurising it). I have a Tecnam P92 and Tecnam, in their wisdom, is installing the oil cooler with the inlet/outlet fittings down (contrary to Rotax installation requirement). After every oil change, I'm cranking the engine with spark plugs removed until I have steady oil pressure. When cleaning out the tank, I also drain the lines and then use a vacuum pump (oil sample pump) to bleed the suction lines and oil cooler at the oil pump inlet.

There is a general misconception that the oil pressure relief valve REGULATES the oil pressure. All it does is LIMIT the maximum pressure at the location of the relief valve. Even the Rotax manual is wrong by saying "The oil pressure from 1.5 to 5 bar (22 to 72 p.s.i.) is controlled by the pressure relief valve (8). The surplus oil returns to the oil pump rotor via the channel (9)." The relief valve can't regulate the pressure below it's opening pressure. According to the Rotax manual that would be 5bar (the operations manual says max 7bar). Below the relief valve setting, the oil pressure is a function of volume (rpm), viscosity (oil temperature), pressure loss (filter, passages) and leakage (lube oil demand from all lube points). I had originally a thermostat fitted with very poor plumbing (90deg brass elbow, 180deg bend in the hose) and lower-than-ideal pressure and pressure fluctuations. Removed the thermostat and re-hosed the suction lines and now have rock-steady 4bar at 5,000-5,200rpm and 80-90deg oil temp. Oil temp control is not with an adjustable blank in front of the oil cooler (25-40% of the area summer-winter). The Rotax engine is the only engine I know of that has the oil cooler in the suction line. Any restriction will cause pump cavitation and erratic oil pressure, the relief valve is more likely a symptom rather than the cause.

check out their history: 1400: abandoned VM 133 MK: abandoned JCV-360: abandoned

I can't compete with this sort of snow, Australia only had some mini snowfall at the start of this winter. This is on top of the highest mountain in Victoria, Mount Bogong at 1,986m (6,516'). I took off from Mount Beauty and climbed past Mount Bogong on my way back to Narrabri.

just commit yourself to 3 stubbies less in the fridge and use that free space for the glue Problem is the shipping from landing in OZ to your location.

I'm in the same boat, I have the Oratex foil but not ready yet for the covering. I did order the unmixed glue with the foil but that is now 5 years old!!! Now I'm working towards having all surfaces requiring covering completed before ordering the next lot of glue (and book some annual leave).

air intake under the prop (round hole), then flex duct to the heat muff on the exhaust muffler, from there another flex hose to the valve on the firewall (bottom left on the P92). The flap directs the hot air overboard (out the bottom) when closed and through the firewall when open. Inside are a couple of smaller flex hoses directing the warm air to the 2 vents on the instrument cover and there is a small outlet in the feet area. Pretty standard for most aircraft.

Just returned from a short trip Narrabri-Glen Innes and back. It was 1-2deg at 7,500', so the heater was on all the time. Glad I have it.

Just be aware that the required glue has a very short shelf life! It only comes in the pre-mix now and is good for max of 3 months at 25deg (Shelf-life 3 months at 25 °C (77 °F), short time (max. 24 h) allowance 30 °C (86 °F)). Don't order it in the middle of summer!

I have used the cabin heat many times in my Tecnam, main reason is to keep the windscreen from fogging up early mornings with high humidity. The Tecnam has a small outlet at the feet and the main one at the bottom of the windscreen. By the time I have done the engine run-up, I have 2 small patches where I can see through and at lift-off, most of the bottom 1/2 of the screen is clear and the rest clears up within a minute or so.

Thanks Mike, I'm aware of that. $150 for 100lt of fuel and $100 for the 4.5lt of oil! The PBS TJ80 is hopefully available with the same lube system as the TJ100 by the time I'm ready. Or AMT has the Nike with a separate lube system. I have a soft spot for the Vampire, sort-of grew up with them and they were the first jet fighters in both of my countries (CH and AUS). And it just looks good and has the right proportions for a scale replica.

This is on my bucket list for retirement: a 2/3 scale DeHavilland DH-100 Vampire with a ducted fan or ~75kg mini jet. This would give it a similar thrust/weight ratio as the original. The 2/3 scale has about 10m2 wing area and should be possible with a MTOW of 300kg = 95.10. Only drawback is that 95.10 doesn't allow aerobatics:thumb down: I have a set of 1/5 scale model plans to start from. Any interest? Currently building a Spacek SD-1 Minisport to learn about the new foam/carbon/ply/timber construction techniques (130kg empty, 6m2 wing area, 33-35hp, 85-90kts cruise).

95.10 has 2 criteria: MTOW 300kg or less, max 30kg/m2 wing loading. The Spratt 103 meets both (250kg MTOW, 10m2 wing area). Use a Briggs 630cm2 (24-30hp redrive) or 810cm2 engine (28-30hp direct drive) and go for it.

close the flap. I built them for my single-seat plane, directing fresh air at the pilot.

Forgot to mention that I use non-polarised glasses for just that reason when flying and driving.

I use general sunglasses with a reading lens in the lower 1/3 (no correction for the rest). Check out the internet, there are quite a few suppliers of sunglasses that can have different corrections (from 0 to x) in the main lens and an added reading lens at the bottom. As a trial, order some stick-on plastic lenses and put them on your normal sunglasses. You can also get safety glasses with the same reading lens built-in (from about 1.5 to 3.0)

DIY vent, 32mm PVC screw adaptor. Redoing it with a thinner flap (2 x 0.8mm ply instead of the 3mm ply).

I use my own page, starts and finishes with the annual (RA-Aus) maintenance record, kept in the aircraft manual in the plane. Any in-between maintenance is recorded on the maintenance record and all flight details on the added page. At the end of the maintenance record period, they all go together in a binder at home. 24-7749 log page.pdf 24-7749 log page.pdf 24-7749 log page.pdf

Look at the specs for the MCR01 'VLA': The wing span and wing area of the 450kg version is far too small to carry 600kg and meet the LSA stall speed criteria (maximum stall speed in the landing configuration (Vso) of 45 knots CAS). Most LSA carrying 600kg have a wing span of 9m or more. Now add the bigger wing, stronger fuselage, undercarriage etc and your empty weight will be much closer to 300kg, like all the others. And the speed has come down to the level of a current very fast LSA (125-140kts on 80hp).