Andy J Posted January 17, 2023 Share Posted January 17, 2023 (edited) Trying to make a 1/4 scale replica of a TM trim quadrant lever as pictured below but don't have any dimensions for the full size item. Can anyone assist with providing me some approximate dimensions please. Edited January 17, 2023 by Andy Joyce Quote Link to comment Share on other sites More sharing options...
Gary Binnie Posted January 17, 2023 Share Posted January 17, 2023 I've got a lot of TM blueprints but I couldn't find the trim quadrant, they are for the Canadian DH82C which might have had a trim tab as opposed to a spring. I did find a 'tab' lever drawing. The altimeter is 80 mm/3" diameter. My map is 8 miles to the inch if you can zoom in! Would have a stab that the trim lever is about 10" from its fulcrum bolt to the shiny knob. Cheers Gary . 2 Quote Link to comment Share on other sites More sharing options...
Andy J Posted January 18, 2023 Author Share Posted January 18, 2023 Thanks Gary. All my photos that show the item are oblique, so its difficult to scale. May have an old aero map in my flight bag dating back to the days when I flew a Robin DR400 so will dig that out and see if I recognise the Class A airspace just above your triangular route which should help scale the item. Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted January 18, 2023 Share Posted January 18, 2023 Intrigued by the Rollason mod placard - what is it and why the very low VNE Gary? Quote Link to comment Share on other sites More sharing options...
Gary Binnie Posted January 18, 2023 Share Posted January 18, 2023 Andy - The airspace is the Brize Norton CTR. Martin - Rollason MOD WAR 75 is the walking on the wing rig, a lady member of our syndicate used to do it (since passed away). Have to fit a fine pitch propeller (also used for glider towing), all a bit of a faff. Quote Link to comment Share on other sites More sharing options...
Gary Binnie Posted January 18, 2023 Share Posted January 18, 2023 The two brackets either side of the fuel tank are the rig attachment points. The cable running across the rear tube is the slat locking cable (locked in for spinning or gusty approaches, also locked while taxiing). Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted January 18, 2023 Share Posted January 18, 2023 I assume that 65 Knot maximum speed only applies with the rig fitted/in use? Quote Link to comment Share on other sites More sharing options...
Gary Binnie Posted January 18, 2023 Share Posted January 18, 2023 The limitation wording used to be on the CAA C of A but it's on the LAA system now with no limitations i.e. the rig is no longer used. There was a weight limit of 70 kg which, happily, I was above (didn't fancy it myself!) The fine pitch propeller limited the speed as it was easy to 'red line' the engine (except there was no red line, just a blurry tacho needle around 2,500 rpm). Quote Link to comment Share on other sites More sharing options...
Gary Binnie Posted January 18, 2023 Share Posted January 18, 2023 Unlike a modern aircraft there is no colour coding on the airspeed indicator, tachometer or oil pressure gauge, there is no VSI (vertical speed indicator). Shiny knob lower right is the slat locking lever, only installed in the rear cockpit. Quote Link to comment Share on other sites More sharing options...
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