Academy rotorhead

Academy included them as part # 44.  Just didn't show them in the instructions.  This is where good research of your topic is very helpful.  After all they are model manufacturers, not aviation mechanics. 

Are you doing this on an Academy kit as well?



If not, here's what I mean when I say void of detail.  Also note the ejector pin marks.

Yea,

That is correct!  Flat plate deviod of detail.  I may be able to send you a picture of the "blade stop" assy after I get back home tomorrow.  The only thing added besides the MR P/C links was some side "trunnion bearing" detail.  I am attempting to scratch build the "blade stop" assy too. 

Wait!  I'm looking at pictures of a UH-1B rotorhead.  Ok, those are complelty different! 

In that case, looking at the yoke from underneth, would it be void of any detail and be flat from the center out to where the grip is attached to this plate?

Best thing is get a book that shows a "D" or "H" model Huey and look at the rotor head.  The grips are on the front edge the blades as well as "B's".  The main yoke between the grips is a "box" type not a flat plate as the "540" system on the "C's".   The main portion of the Academy "C" rotor head is correct. 

Well, I found that Cobra Company has a UH-1D to UH-1C backdate set.  It comes with blades and rotorhead that look correct.  However, I don't know what the difference between B and C model heads are.  I sent them an email asking but their inbox is full and it bounced.

Any ideas on this?

I'm not exactly sure what part you are looking at but the main "yoke" was a flat plate with a hole in the middle for the main trunion support for the mast and the two "ears"  on each end that attached to the blade grips.  The forward edge of the grips would be covered by the sand shield.  They also left off the blade stops with the arms right under the blade yoke on the mast above the hydraulic dampers.  They prevent mast bumping at low rpm. 

Melgyver wrote:

They also missed the main pitch change links that go from the incorrect inverted cups on the main blade pitch arms up to the mixing levers in the middle of the stabilizer bar.  You would need to cut the cups and have the "opening" facing up.  The pitch change link would run up to the inside of the "Y" mixing levers.  It would like like a short "tie rod".

Yea, I noticed that as well.  Figured I'd do those too until I saw the other major issue with the rotorhead.

Actually, the more I look at the rotorhead, I see alot of things wrong.  The main part of the head that includes the blade grips is wrong as well.  Academy has this unit as being somewhat flat.  As a result, the underside has no detail.  It would be almost impossible to fix since the cross section of this area shouldn't be flat at all.

This a real bummer since I'm 75% done with this thing and most everything else in the kit has been fairly accurate.

They also missed the main pitch change links that go from the incorrect inverted cups on the main blade pitch arms up to the mixing levers in the middle of the stabilizer bar.  You would need to cut the cups and have the "opening" facing up.  The pitch change link would run up to the inside of the "Y" mixing levers.  It would like like a short "tie rod".

Yup, Academy missed them.  You have to make them out of stretched sprue or plastic rod.

As best I can remember there should be 4. You could make them from streched spruce or wire