planesmaker

Hi Scott, yes I had exactly the same problem and went thru two aviasport gauges before I stumbled on the solution you describe. It may not be widely known as Floods had no idea. I needed to fit the smaller 2 1/4 gage due to space requirements. My first one lasted a couple hours and pegged out. The second one worked for a while and then would go off scale after 5k rpm or so. I then tried the 3" gage and it worked perfectly, but I needed the 3" hole for something else. I imported an American 2 1/4" gage and it helpfully had the instruction that if the gauge becomes erratic at high revs, to fit a resistor as you describe and it works perfectly. I can only presume the larger 3" gage has room enough to have a resistor inside? It's interesting you should make this post as when I was having my issues with 2" gauges, I saw on your plane at Watts and noticed the smaller tacho and I was wanting to ask how you were going with it. I agree that aviasport should address the issue as the gauges are not cheap.]regards, mark

Tom

It's time things were done by the constitution. A President should not act alone. Good on you John and Jim and anyone else who will stand for honesty and integrity. If the President has such little regard for our constitution then do not be surprised when the rank and file develop a disdain for rules and regulations which may lead to even more safety implications. Tom

28 rego refers to aircraft built under 101.28 regs ie amateur built aircraft as opposed to experimental(19 rego) . They built under saaa with all inspections and no deviations from plans without reg 35 approval. It was how it was done before experimental category came in. I believe builders can still choose to build under 101.28 if they choose. Tom

Yes the CASA site is really difficult to use, hopeless to find what your looking for, can waste a lot of time!!! Sometimes it works better to google it and let google find it on CASA website, it's worth a try. Tom

I was talking to Phil Goard a few weeks ago, they are hoping to have a conversion on display at Natfly. So yes it is on its way. That will give people some options. Tom

Well the black boxes checked out fine at Floods, so i need to get back there and refit the boxes to the original motor to see if it still playing up or if it was a bad connection that fitting the other boxes fixed Will let you all know what happens.

Have somebody qualified to do the leak down (a respected L2) they will know what to do next. If you don't have much experience with rotax engines, get someone else to look at it, that's the safest way. Tom

Have a simple leak down test done on it. Must be done with engine warmed up. A cold pull thru it is not uncommon to have 1 cylinder different to others. A leak down will tell you if you have a problem. Tom

Please let us know if they find a fault, good to know for future reference. Tom

I should add, just near the connector at the top, there was enough wire to strip and put in new connector. Tom

I have had the wire broken(twice it has happened) from pickup to ign box, I would be surprised if it is the box itself. sorry a little late with the reply only just logged in. Regards Tom

Bugger, no longer available it seems :(

does any one read the tech manual??? here's the link. actually it should be the first place people go for an answer, saves a lot of misinformation yhat way.

http://dev.raa.asn.au/documents/techmanual/4-2-5.pdf

Fatman, C/S props are definitely available for rotax. I have one fitted on my 914, set the revs you want then use Manifold pressure for power setting. it will maintain the revs no matter what you do (climb, descend etc.) Tom

I can say that a J230 with a 912S if fitted with C/S prop will perform well, at least as well as a Jab3300 engine.In my opinion a very viable alternative if someone wants to develop a STC for it. Tom

Hi TomHave you any details of fitting a bolly prop to a p12 80ho in a Skyfox. I see Wigg mentioned being happy with the Bolly on thier gazzelle.

Thanks Mike

True, just buy an amateur built aircraft in the first place.

http://www.raa.asn.au/wp-content/uploads/2012/02/Section-7.5.4-Cancellation-of-alteration-of-an-LSA-special-certificate-of-airworthiness-or-experimental-certificate.pdf

I think you will find the lycomings a bit heavy and limit the useful load on a Jab. they are around 30kgs heavier, do the maths first. Rotax is a good option though. Tom

I know of a Tecnam bravo with one fitted although not sure it is truly C/S. Tom

Merv, I Have a c/s prop, set the revs you want then adjust manifold pressure just like the 182 or 210 I used to fly, it will maintain the revs whether I climb or descend or whatever. Nev if you are ever in Tumut I will take you for a fly!Tom

Yes I d[d say a 912s fitted with a c/s prop, that is what makes up any difference in the HP figures! Props have a big variance in efficiently turning torque into thrust. Using a rotax allows a bigger selection of more efficient props.

Nev, I will have to disagree about the 140hp, it really does depend on the all up wt.( and the size of the people :-) ) I have had 2 x 95kg + 1 x 135kg people (700kg auw) in my j400, off the ground in about 400m and climbing at 1000' /min and that is with the small wing and 115hp!

Tom

I believe the 912S will perform in a j230 better than most people think, I regularly take off using only 100hp with the 914 J400 with the family on board, performance is at least as good if not better than the Jab powered aircraft. If you can wait a few months we will have a j200 with a 912S flying and all will see that is really is a viable alternative. I have heard of one already done but unfortunately I have not spoken to him personally about the conversion I would like to though. Tom

A lycoming 0-233 in a jab is a bit too heavy ( we have already looked at doing it!) particularly in a J230 where your empty wt is already pushing 380kg with the Jab engine, another 30 kg plus a probably heavier prop and you have a very limited aeroplane. Keep it light and keep it simple. Want to do an engine swap?Fitted with a c/s prop it will perform every bit as well with a 912S as it does with a Jab 3300 engine and about the same wt(maybe 5-10kg difference). Just my 2 cents worth. Tom

My Jabiru must have ABS, as there is no way it will ever lock up!

sorry this link

http://www.dailyadvertiser.com.au/multimedia/41729/584773/picture-oscar-colman.aspx?Start=15&page=1