FiberClassics P-51 now Comp-ARF P-51
03-04-2009, 04:13 PM
#878
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RE: FiberClassics P-51 now Comp-ARF P-51
I'm starting the build on one of these mustangs.
Here is the extension shaft I have made. The material is 7075 ali which is as hard as steel.
The pictures show the method.
Here is the extension shaft I have made. The material is 7075 ali which is as hard as steel.
The pictures show the method.
03-04-2009, 09:41 PM
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RE: FiberClassics P-51 now Comp-ARF P-51
coool..[sm=thumbs_up.gif]doing your metal work is whole other ballgame....maybe one day...now it's give Darrel a call or head down to the local auto repair shop and hope they can help you out....
03-06-2009, 11:09 PM
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RE: FiberClassics P-51 now Comp-ARF P-51
Got the central extension shaft made. Tried dialing it up but it is way off. It is not going on this motor so am not worried yet but I may need to make a completely new central shaft unit. Also got me thinking that maybe the stock shafts have some runout.
03-09-2009, 04:47 PM
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RE: FiberClassics P-51 now Comp-ARF P-51
Got some long capscrews for the extension shaft and lengthened the threads, a bit of a mission as the screws are 12.9's the toughest grade.
Made a dummy spinner back plate with clearance spacer as an aid to mounting the motor.
Made a dummy spinner back plate with clearance spacer as an aid to mounting the motor.
03-11-2009, 08:24 PM
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RE: FiberClassics P-51 now Comp-ARF P-51
Gary...are you talking to me! (said with a DeNiro accent)
Vailly Avaition pilot...who needs another layer of flattener sprayed on!...and a parachute under his butt to raise him up a bit.....
Avrod..nice dummy cowl spacer....here's a real dummy wheel too if you need a reference!
Matt
Vailly Avaition pilot...who needs another layer of flattener sprayed on!...and a parachute under his butt to raise him up a bit.....
Avrod..nice dummy cowl spacer....here's a real dummy wheel too if you need a reference!
Matt
03-19-2009, 07:48 PM
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RE: FiberClassics P-51 now Comp-ARF P-51
Here are a few more shots of the engine installation. Thats as tight as I could get the header, the motor will need to be angled to one side slightly to give the header clearance.
03-23-2009, 04:41 PM
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RE: FiberClassics P-51 now Comp-ARF P-51
Hi Jack the shaft extension is 51mm long as is the central spigot that carries the prop. Unfortunately the central spigot extension is around .5mm out of true so I will need to revisit that and get it right. Incidentally I have 3 DA 85's here and I measured the stock central spigots nad they are between .17mm and .2mm out, I would have thought less than .1mm would be acceptable.
03-23-2009, 04:47 PM
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RE: FiberClassics P-51 now Comp-ARF P-51
Alan do you mean shaft extension? I think any extension will void your warantee. The limiting factor is side loads on the bearings due to gyroscopic precession, not sure what that limit is depends on how hard you manouvre the model at high revs.
03-23-2009, 04:50 PM
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RE: FiberClassics P-51 now Comp-ARF P-51
Here are some of the parts for the rubber mount. I cut rubber with a sharpened tube and use glycerine as a lube.
03-24-2009, 02:33 AM
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RE: FiberClassics P-51 now Comp-ARF P-51
i have a 3w70 red head to go in mine and it will fit nice but the length of the mounts are 100mm off the bulk head they have been made out of 22mm ali bar
03-24-2009, 03:24 AM
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RE: FiberClassics P-51 now Comp-ARF P-51
Here are some more pictures of progress. On the left you can see how the rubber isolator system works. The stiffness can be adjusted with the length of the central ali spigot thingy. The false firewall will get reinforced with carbon cloth and mounted to firewall proper with ali standoffs around 55mm long.
03-24-2009, 02:38 PM
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RE: FiberClassics P-51 now Comp-ARF P-51
Alan have just been looking at the DA 85 manual again. They do not recommend usinng stand offs and will not cover the motor if they are used. I think this is because of the possibility of missalignment with the mounting lugs which will then break off. Conersider a false firewall using your extensions or ply box. I have eliminated the stress by using the rubber mounting system, which will still be hard enough not to flop around.
03-26-2009, 12:26 PM
#900
RE: FiberClassics P-51 now Comp-ARF P-51
Great job the the engine prop drive extension.
Having step many years fiddling around with soft mounts in all shapes and sizes... I'm a little disappointed with your proposed solution.
That's not the best way to go in my opinion.
Having step many years fiddling around with soft mounts in all shapes and sizes... I'm a little disappointed with your proposed solution.
That's not the best way to go in my opinion.