jeffcb52

I have had three of those useless chinese altimeters. The last on did 5 hours.

I was referring to the ssensor for a carby ice detector, not a temperature measuring device. The probe has an LED which shines onto a sensor. Ice forms on the probe before the carby butterfly and gives a warning. Seems to work well. regards Jeff

Dear Garry, Without going to the hangar and having a look, I think I have a fibreglass elbow between the carby and the scat hose carrying air to the carby. We welded a nut with the correct thread onto a small plate and fibreglassed it onto the side of the fibreglass elbow thingy. Sensor screws into nut. Has been there for 5 years and works well. Regards Jeff

Danny, It's possible the difference is due to your engine having hydraulic lifters. I would happily wear the expense if it worked. Good to meet you last Sunday. Regards Jeff

I just replaced the Shell W100 plus I have been using in my J200 3300 (solid lifters, coarse heads) with Exxon Elite 20W-50, and my judgement is that oil temp is unchanged. It's expensive too. Jeff

As I replied previously, send me your email address and I'll email a couple to you. Can't seem to make them upload here Jeff

I have a lot of trouble with oil leaking from under the mechanical fuel pump gaskets/spacer. I am diligent about tightening, use loctite etc. The problem seems to be that over time the plastic spacer deforms and allows everything to come loose. Repeated tightening to stop the oil seeps eventually cracks the spacer across the bolt hole, causing a much more serious oil leak. Anyone else had the problem? I am wondering whether an aluminium spacer would solve the problem, or would that cause some other problem. Regards Jeff

Repair with a layer or two of kevlar is easy and good. Jeff

Ian, I cut some squares or circles of fibreglass a few millimetres thick and glued them on the inside of each existing hole with epoxy and floc. Clamp overnight with a spring clamp and redrill hole the next day to the appropriate size for the self tappers. The extra meat for the screw to bite into has worked well. They stay tight and are amazingly cheap. Regards Jeff

I have over 400 hours in a Jabiru powered Lightwing and agree totally with NigelB. You run out of rudder authority at some stage before the tail is down. Only a problem in cross winds. I learnt to land wheeler style in a Thruster with Tony Hayes, so I am familiar with wheelers and find them very easy in the Lightwing if there is not too much crosswind. However I usually do three pointers. Regards Jeff

Ian, I bought a new spring form Jabiru and it is considerably stronger than the original. Regards Jeff

I don't think a gentle bending of the cable increases the friction too much. It comes from the rubber boots at each end of the cable (removing them helps), but mainly from the internal resistance of those servos which do not have an electromagnetic clutch to disengage when a/p is not in use. The bigger the servo the greater the residual torque. Bigger servos are heavier and longer and take more room to mount-not a problem if mounted in the rear of plane. One of the great benefits of a digital a/p such as a TruTrak is having its own attitude sensors. It is a whole separate attitude system independent of any other attitude instrument, and is therefore another level of redundancy. If you attach an a/p to an existing efis, then one failure leaves you completely vulnerable. You might save $1-2,00, but it is a compromise. Jeff

AP servo photos photo of servos

I have sent J430 a few photos. Hopefully he can post them on the site. I don't know how to do it . Regards Jeff

Dear J430 I have a trutrak a/p in my J200. Started off with small servos but had to upgrade to size C on ailerons and HT (I think) gearbox servo (with electromagnetic clutch) on the elevator. The latter is $1000 more expensive, from memory, but has the advantage of no residual friction when disconnected. The normal C servo on my ailerons has noticeable residual drag, which takes even more feel out of the controls. However it is a brilliant device. Jeff