Ian Williams I follow DOG from Montana, one of the prettiest of the Great Satan's 50 states. I own an H-36, SN 3518, and maintain another for a friend.
I read your post discussing a modified aileron actuation mechanism. I am not familiar with that, so wonder if you could enlighten me? My friend's H-36 has an odd characteristic--at the onset of any disturbance or turbulence, the ailerons oscillate. I'd call it aileron snatch, but it doesn't quite fit the formal definition for the phenomenon. I'm headed his way in the next couple days to check the rigging; last time I was there, we checked and there is no play in the system. His bird is very tail heavy for some reason, so its CG is very near the aft range. This may or may not be relevant. Best, Michael Stockhill On Thu, May 21, 2015 at 5:14 AM, Ian Mc Phee <[email protected]> wrote: > Interseting your observation about the tilt of the engine and may explain > something. Ours points up for some unknown reason but is goes so well. We > have bing carb and I had to finally fit different jets in each carb to even > up temeratures (one 2.05mm and other 1.90mm). Bings only adj is jets. > > Ian McPhee > > Ian McPhee > > > > On 18 May 2015 at 09:29, Ian Williams <[email protected]> wrote: > >> Hi All, >> >> >> >> Interesting reading. Nigel … rip into it, I am looking forward to >> seeing the finished HK36. >> >> Regarding the engine mount for the H36, One thing I have noticed, looking >> at all the pics of Dimona’s available on the internet is the thrust line of >> the earlier H36’s seems to be different as compared with the later ones … >> I mean that if the prop is vertical and you are looking at it from the >> side, the prop angle looks as if it is at the wrong angle ref the fuse … it >> pointing “up” The later H36’s seem to have a lower “angle “ relative to >> the fuse. (Havn’t explained it that well but you should understand). Our >> H36 is an earlier one (S/no 3537) We have 2 alloy spacers on the rear >> mounts which decrease the angle a bit which I assume is the same for all >> the ex Thai Dimona’s. Later h36’S seem to have a lower angle. >> >> Of interest, we have just done 100hrs in GCB since its first flight in >> June last year. It is a great little rocket and by far has exceeded our >> expectations. It has the original aileron control configuration but a new >> set of bearings in the wings (5 sets per wing) A mission to replace but >> works well. It is different in that the control forces than the later ones >> … the stick is quite “firm” around the centre for a small lateral control >> input but max aileron control load at speed is actually significantly less >> than a Grob 109 which I am involved with. It does take a little to get >> used to but is quite OK. With the new bearings there is no “sticking” at >> all. When cruising at 90 kts or more, the ailerons do lift up about 15mm >> or more. However both are even. Looking at the wing section and the >> pressure distribution under the ailerons it is quite clear that the >> compressive load into the aileron push rods is very high so the modified >> configuration was a logical one. >> >> We have had 2 problems … the first was a fuel blockage where there was >> some crap in the banjo bolt at the bottom of the fuel tank which was >> impossible to see (looked like grey cotton wool) .. ie between the finger >> strainer and the 3 outlet holes of the fitting … not helped by using some >> CRC rubber for a small sealing job on the tank (learn’t a real lesson >> there) However all replaced, flushed out and OK. >> >> The other issue is at lower RPM and lower airspeed the prop tends to slip >> into fine pitch. Not a major problem as in cruise mode it is OK. >> >> Other interesting things are >> >> · I have installed an MGL fuel computer using the original VDO >> float and a new turbine type flow sensor … a great system as you know >> exactly how much fuel is available and it also removes the non linearity of >> the fuel tank contents (5 calibration points) >> >> · The engine indicates an oil temp around 65 to 80 degrees C >> cruising. RHS rear cyl drops to about 120degrees C and the LHS side around >> 160. I think the variation is caused by a slightly different mixture >> setting of the carbs. Take off cyl hd temps around 190 (depending on the >> OAT) >> >> · I have installed a 5 V regulator supplying power to a small >> GPS plus a couple of USB sockets to keep ipads etc charged (note if using >> USB sockets the 2 * signal pins need a specific bias voltage to enable >> apple products to accept a charge … tricky people those apple dudes. >> >> · I also connected the comm. Radio audio amplifier to double as >> the Intercom amplifier with a panel switch that turns it on or off. Very >> simple and works real well. Combined also with a MP3 socket so ad you are >> cruising along, you can play music from your iphone thru the headsets. A >> real spin off also is if someone calls you the ringing and audio from the >> iphone is directed thru the intercom so no problem hearing the person >> calling. >> >> >> >> So all good. If any of you happen to come to New Zealand I would love >> both to see you and can provide some accommodation if required. I think >> Wolf Hoffman did a great job all those years ago. >> >> >> >> Best regards >> >> >> >> Ian Williams >> >> ZK-GCB >> >> >> >> >> >> *From:* [email protected] [mailto:[email protected]] *On >> Behalf Of *Ian Mc Phee >> *Sent:* Saturday, 16 May 2015 10:53 p.m. >> *To:* Laurie Hoffman; DOG LIST >> *Subject:* Re: [DOG mailing list] Engine mount for Limbach >> >> >> >> I will take photos tomorrow but it is a great (brilliant) mod & you must >> have it in a L2400 to gain access to oil filter. Engine in and out is a >> piece of cake especially when you remove front engine mounts AND the front >> Truss (2 bolts). Engine goes in and out with muffler exhaust all attached >> to engine. So easy. >> >> Im >> >> On 16/05/2015 7:29 AM, "Laurie Hoffman via dog" < >> [email protected]> wrote: >> >> Hi Ian, >> >> Re removable front cowl panel. >> >> Did you find the template that you had? >> >> *Regards* >> >> *Laurie Hoffman* >> >> >> >> >> >> >> >> >> ------------------------------ >> >> *From:* Ian Mc Phee <[email protected]> >> *To:* DOG LIST <[email protected]> >> *Sent:* Saturday, 16 May 2015, 7:21 >> *Subject:* Re: [DOG mailing list] Engine mount for Limbach >> >> >> >> They are VW part & will check old box later for number or may have it >> written up in logbook. Front ones need drilling and cutting. Back is as is >> ready to use. Do you have the removable panel at front? Great mod. >> Ian Mc Phee >> 0428847642 >> Box 657 Byron Bay NSW 2481 >> AUSTRALIA >> >> Ian m >> >> >> >> On 16/05/2015 5:27 AM, "Angel Jimenez Martin" <[email protected]> >> wrote: >> >> Hello everyone, >> >> Could someone tell me if it has the same engine mounts Limbach flock of >> Dimona and Dimona Mk 2. >> >> Greeting >> >> >> > >
