Aluminium cheek plates

eddie

RAF, turbo subaru 230hp
Joined
Jan 19, 2011
Messages
1,683
Location
Polvadera,nm 87828
Aircraft
230 HP turbocharged RAF
Total Flight Time
8,000 plus
1 mm is only 0.04 thick so your looking at a plate that is 0.20 thick,what is the wall thickness of the tubing that the plates are attached to, shouldnt the plates be at least the thickness of the tubing wall.

best regards,eddie.....
 

GA Rotor Guy

Newbie
Joined
Nov 27, 2012
Messages
756
Location
Atlanta GA area
Aircraft
Single Dominator
Lets look at this from the perspective of the bolts...

The rotor is attached by ONE teeter bolt... which is usually 3/8"... However:

The issue, as noted above, is not particularly the bolt(s) diameter... but also the thickness of the material the blot goes through. Wallowing of holes, which vibration does... and the rotor system is prone to vibrate/oscillate... is IMO a larger issue.

The gyro's I have observed, had 4-6 1/4" Aircraft grade bolts... through minimum 1/4" thick plate. Note this is only my observation.

IMO what would be good is if one of the engineers came along and posted some good theory/practice on this topic... as this 'seat of the pants' approach could well produce a statistic none of us wants to be part of... (whoops)... :(
 

Earthboundmisft

The 'FIXER'
Joined
Jun 1, 2006
Messages
2,105
Location
Satellite Beach, (Sea Park),(Original 'Lums Bums'
Aircraft
The 'MISSFIT' gyro, GRAND CHAMPION, Bensen Days 2010
Total Flight Time
700 F/W, 227 Gyro
1/8 6061-T6 for the cheek plates.
(4) 1/4" AN bolts into the rotor head,
(4) 1/4" AN bolts into the mast.
Just took mine apart tonight as a matter of fact.
Installing a brand new RFD rotor head for sh!ts and giggles.
Hoping it will be even smoother than my old Parson's bushing style head.
Got some bead blasting to do... Skimming the sand dunes has taken its toll.
Truth be known, 1/4" cheek plate bolts are overkill.
 

eddie

RAF, turbo subaru 230hp
Joined
Jan 19, 2011
Messages
1,683
Location
Polvadera,nm 87828
Aircraft
230 HP turbocharged RAF
Total Flight Time
8,000 plus
I agree 1/8" would be more than enough. Overbuilding is easy to do, getting it just right
is the reason there are engineer's. This forum could use more input from these guys,eyeball engineering is a quick way to disaster.

Best regards,eddie.....
 

j bird

Gold Supporter
Joined
Nov 11, 2005
Messages
1,876
Location
Cave Junction,OR.
Aircraft
Dominator/Airworthiness Certificate 9/06/12
Total Flight Time
26.5 duel,RAF,Sparrow-Hawk,Cavalon,Calidus.
1/8" plates, 1/4" bolts on a Dominator.
 
Joined
Jun 24, 2008
Messages
445
Location
St Augustine, Fl.
Aircraft
Dominator Tandem and single
Total Flight Time
500+
1/8 6061-T6 for the cheek plates.
(4) 1/4" AN bolts into the rotor head,
(4) 1/4" AN bolts into the mast.
Just took mine apart tonight as a matter of fact.
Installing a brand new RFD rotor head for sh!ts and giggles.
Hoping it will be even smoother than my old Parson's bushing style head.
Got some bead blasting to do... Skimming the sand dunes has taken its toll.
Truth be known, 1/4" cheek plate bolts are overkill.
Salt water is a BITCH!!!:rant:
 
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