RAF/Sparrowhawk/SC 2.5 FI
- Aug 1, 2016
- Crawford, CO
- 1967 Turbo/RSTOL/VG Cessna 185 Skywagon, 1946 Grumman TBM Avenger
- Total Flight Time
Hi Eddie-eddie;n1135829 said:Yes it barely shows its just slightly higher than the belt and has a slight taper to the upper inside edge,which you cant see. it
looks like a end cover for the upper pulley
I assume you're correct of course, but how can the belt not rub on the end flanges if it it up against them? Because they are turning also?eddie;n1135911 said:Actually the belt stays on track by virtue of the 2 end pieces on the upper and lower pully,the bottom
one is on the inside and the upper on the outside,the belt can't move in either direction,also there is
no rubbing of the belt as the end pieces are moving with the belt and pully.And as for using the
upper motor mount tubes for adjusting the track on the RAF I have never heard of that before,and
I don't think that would even work the plate that the upper pully is mounted to would have to flex and that's
not possible to do with the upper engine mount tubes as the whole engine is mounted on rubber.And if
you could get it to flex it probably would crack from the stress. I buy my belt from Amazon.
There is one other thing about the RAF drive unit that should be mentioned,the cross bolt that holds the
drive unit in place should only be hand tight just snug it down don't put a lot of pressure on it as the plate
could crack,the three bolts on the collar will hold the drive from slipping its belt adjustment.
yeah man, I'd absolutely love a ride in your machine. I can't imagine the time you've put into the seemingly very practical and necessary mods so many gyros could benefit from. Continental is who made the new belts I bought. Still have to get them on. I had heard that the bearings on the RAF models had some issues, but that was probably the first ones out and I'm sure things have changed. I'd love to find the time to figure out that turbo project, but time is scarce. Will probably have to settle for the Cam grind if I can get the time for that.eddie;n1135958 said:That's right the belt and the end plates are turning at the same speed,I have never thought about track adjustment,I use goodyear belts however the name has been
changed to contitech hawk as continental tires bought the goodyear line of rubber products buts its still the same quality,My belt is 3 3/8" wide(85 mm),
and I paid $120 for the belt,I have never changed my bearings and have about 800hrs on them,I changed the belt at 400 hrs.My Subaru engine is producing
230 HP and I swing a 5 bladed 68" prop pitched to 14 degrees and so far the PSRU has been good.
You may be taking an increasing chance (with your crank pulley in particular), from what I've gleaned on the forum.I have never changed my bearings and have about 800hrs on them