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  #551  
Old 04-05-2021, 08:44 AM
jliltd jliltd is offline
 
Join Date: Sep 2013
Location: Rancho San Lorenzo
Posts: 1,003
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David,

In my RV-3 any toggle switch along the bottom of the panel was primed for being inadvertently bumped while moving my hands around the cockpit. I had similar panel control placement such as yours where items in the center and right side, such as your com radio, iPad and clock, needed to be grasped, flipped or touched. While reaching around I was always unintentionally knocking toggle switches up or down. It was even more prevalent if I swapped hands on the stick to free up my right hand to twizzle or touch something on the panel, such as your iPad location. The hand coming off the stick is already low and near the bottom edge of the panel so after releasing the stick the upward movement of the hand was right at the bottom toggle location, as was the action of the other hand reaching to grab the stick. Remember the RV-3B is a personal rocket with the flight control location low and forward compared to the Cessna. It also does not have the panel setback or vertical spacing of Cessnas or even other RV models. You might want to mock up the stick in place and move it around while changing hands on the controls and then reaching towards the panel with the free hand. You might also be surprised how short the RV-3 control stick is and how close it crosses under the panel with little clearance. Mine only had about 1/8" clearance below the stock panel. You might have to cut down the stick even further for the switch panel.

Point being there is nothing fundamentally wrong with your current layout but focus on hand movement ergonomics and selector switch locations. You might want to run a towel-bar type switch bump guard below and maybe even above the switches. Think twin-engine mag switch guards. There are also individual switch bump guards that can be installed from the likes of Perehelion Designs.

I can't tell you how many times I bumped a switch while moving my hands around the RV3 cockpit. The master was the worst one to bump off. Thankfully I had a keyed ignition switch so never unintentionally switched off the mags. I would prefer ignition/mag switches be set off in a non-operating area since they are used during start and run-up and then mentally tucked away. Why not physically tuck them away too? Maybe locate them to a less valuable non-activity real estate area in lieu of, or in addition to a bump guard.

I would like to see some responses from other RV3 pilots with decent operational experience with their panel ergonomics and switches. All this could very well be "just me". I haven't had this type of issue in other model RV's. I only have an hour in an RV-4 which might have just as tight cockpit as the 3.

In your layout switches 2 thru 4 (from L to R) are fairly critical and #'s 3 & 4 right by the centered flight control stick are ripe for bumping. Especially with the comm radio controls in the same area. Have you considered moving the comm radio control head to above the Dynon EFIS (I am assuming something like a TY-91 or Dynon remote VHF com). Puts it where easily accessible by the left hand and in good view of the pilot. The EFIS and comm radio will probably get the most action in flight, followed by the right-hand accessed iPad.

I love keeping up with your project here. It's going to be an amazing bird.
__________________
RV-8
(a few more airplanes too)

Last edited by jliltd : 04-05-2021 at 08:48 AM.
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  #552  
Old 04-05-2021, 01:55 PM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,720
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Thanks for these comments.

I have sat in the cockpit a number of times with the switch panel (and the avionics shelf, which is part of the same fiberglass part) installed. I need to pay attention to my legs getting in to miss the switch panel but not much all in all; it's not a big deal. Getting out, there is no issue.

Once in the cockpit there's plenty of room for me. The switches are inset about 3/4" from the panel, forward (that is, airplane-forward, and away from me) of the panel and there's plenty of clearance, about 1.5", between it and the stick. That's shown a couple of posts earlier. While accidentally moving something might be an issue, I don't think it will be - especially with the current switch panel layout, which moved the push-button switch closer to the center. I'm also changing switches for better feel, but that's a separate issue.

I am about 5' 7" and have relatively short arms. When I buy long-sleeved shirts they are always too long in the arms and often either just right or a bit short in overall length. For me, it's enough of a reach to the switches that I'm not worried about accidentally bumping one.

The RV-3 as designed has an indented seat, allowing more height for a tall person like Van. I filled that in and still need a cushion.

Please keep the cockpit comments coming. Cockpit layout is a new science to me and I want your comments and insight. It's curious.... I can tell good design from bad but have little idea how to get there except by trying out concepts.

Dave
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