teamgrumman(at)yahoo.com
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 Posted: Sat Aug 27, 2011 9:53 am Post subject: 626 . . . . was Re: Carb airbox |
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And, Bob, you know, for the life of me I'll never understand the logic behind that airbox. Not only is the entry into the airbox located in an area of accelerating airflow (i.e., Bernoulli would say, reducing pressure) on the bottom of the cowling, but it is so big that removing the cowling becomes a nightmare. Then, there is installing the cowling. Then getting the SCAT hose in place.
But, the real issue is losing between .8 and 1.0 inches of manifold pressure.
I've been flying my own design on 626. This plane has pressure transducers with digital readouts that measure Static and Manifold Absolute Pressure. Flown side-by-side with an identical AG5B and it's stock inlet and the minimum delta between the 2 planes is .8 inches with 626 always showing a higher manifold pressure. Plus, my airbox is only 3 inches high at it's highest point . . . still mounted on the side of the cowling. Even with an airbox that requires cutting into the metal baffle on the front of the engine just to make it fit, it's noticeably easier to remove the cowling.
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626 got new wheel pants this past week. This is the umpteenth set of wheel pants I've installed. The first, however, that needed the bracket for the rubber shock mount on the topside of the landing gear.
Lessons learned:
(1) The parts book showed shims that fit under the bracket. Honestly, I'd never noticed a shim . . . but I never really looked either.
• I got the thick shims. Nope. Made the bracket too high. No shim was about right.
(2) The bracket that bolts to the inside that supports the inside of the fairing arrived undrilled for the fairing mounting holes.
• OK. Now, how in the world do I figure out where the holes are supposed to be????
• Figuring: Since the wheel pant has only pilot locating holes, I can make it fit perfectly. Just match drill the two.
• The first thing I noticed was the bracket is not the same length as the one on my Tiger. It's shorter.
•• This required corner nutplates
• During installation, it became apparent the fairings do not have the same curvature as that required by the bracket.
• Warping the wheel pant into place (with brackets bonded to the wheel pant) I needed to enlarge my 3/16 inch holes to 3/8 inches.
(3) I had a lot of difficulty getting the left wheel fairing mounted due to it not conforming to the shape needed.
• The sides mounting to the inboard bracket needed to be pulled in well over 1 1/2 inches.
(4) Nose gear: The pilot holes for the tow bar holes on the nose wheel pant, if you select the axle hole as reference,
and keeping the bracket parallel to the bottom of the wheel fairing, are off about 3/8 of an inch.
• Match drill AFTER the bracket is installed.
• For the top seal, DO NOT DRILL ALL OF THE HOLES AT THE SAME TIME.
• Make sure the seal is in place, locate the two front holes, Drill, install rivnuts, attach with screws, THEN DRILL THE REMAINING HOLES.
626 is 5 knots faster with wheel pants.
From: "n76lima(at)mindspring.com" <n76lima(at)mindspring.com>
To: Gary Vogt <teamgrumman(at)yahoo.com>
Sent: Saturday, August 27, 2011 7:07 AM
Subject: Carb airbox
| Quote: | Unfortunately, the good folks at American General took a really simple and
effective electrical system and fucked the hell out of it. -It was probably >designed by the same guy that designed the stupid air intake for the carb.
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Whoa, slow down Gary. That was the sainted Loyd Montague, now guru (at) TF, that made the first AG-5B airbox.
--Bob Steward
[quote][b]
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