tupps
New Member
Posts: 3
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Post by tupps on Oct 17, 2018 10:41:46 GMT
Gents,
Firstly congratulations on a fine product which has a great future. I am of the "older" generation and love the challenge of flying the "old iron".
Question I have, is how to set trim for takeoff? I found a checklist for this acft and it states "Set Elevator Trim to -1.5 Nose Up Trim"
Seems reasonable, but when viewing the trim wheel, there appear to be no indications as to the current position of trim.... I.e. no Zero position mark as a reference.
So in essence, how do I set the trim to -1.5 Nose up? I.e. no datum to work from....
Any help appreciated.... cheers
chris from oz
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Post by VSL-Admin on Oct 17, 2018 12:55:50 GMT
Hi! Thanks you for your feedback! The takeoff trim indicator is indeed simplified in the current version. The aircraft is designed so the trim for takeoff is already set as you are loading the aircraft in X-Plane. You can monitor its location for further usage (flight with multiple takeoffs). It is to be considered the 'Neutral' pitch trim position. In the upcoming update of the project, trim indicator is scaled, adding the ability to use the indicator and trim as described in the POH. In the C-47 POH, the trim indicator is marked with angles-nose-up/down (-12,-8,-4,0,4,8,12). In the C-47/Dakota POH and other reference checklists and documentations....when executing the Before Take-off checklist, the Trimming tabs should all set in the neutral position ("0"). This is for the Ailerons, Rudder and Pitch trims. So, you don't need to set the trim to -1.5. Which checklist have you found stating this value? it is interesting...  |
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tupps
New Member
Posts: 3
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Post by tupps on Oct 18, 2018 1:34:25 GMT
Thanks for the quick reply,
Very informative, thank you. Re the checklist, it was sent to me by a friend, not sure of it's origins... Lesson there, don't believe everything you read!
One more thing please, I have found takeoffs much easier if I use a couple of notches of right rudder trim. Is this not correct procedure? Should it be neutral as well?
Really enjoying this!
cheers
chris from oz
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Post by VSL-Admin on Oct 18, 2018 6:19:05 GMT
Thanks for the quick reply,
Very informative, thank you. Re the checklist, it was sent to me by a friend, not sure of it's origins... Lesson there, don't believe everything you read!
One more thing please, I have found takeoffs much easier if I use a couple of notches of right rudder trim. Is this not correct procedure? Should it be neutral as well?
Really enjoying this!
cheers
chris from oz
Hi ! Because of the nature of the spinning airflow which is being forced backwards towards the tail section, from the propellers, and because of the p-factor of the twin-engine DC-3/C-47, in which the aircraft is at high power and has a high angle of attack...(such as during take off) a slight, but noticeable yawing motion will be existing (due to asymmetrical relocation of the propeller's center of thrust). These two will require the use of rudder during takeoff to correct. Usually it is done with the pedals (while the rudder trim is centered). In the simulator, rudder control and sensitivity might get no to comfortable, or too twitchy, so one can decide to help a bit with by trimming these notches. Thanks for the feedback! |
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tupps
New Member
Posts: 3
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Post by tupps on Oct 18, 2018 14:07:25 GMT
Thanks very much for that, very informative indeed.
Appreciate the background physics of this aircraft, most illuminating, stuff I didn't know....... whilst I'm not a perfectionist, I appreciate accurate modelling of the aircraft characteristics.
I have modified my procedures to only use neutral Pitch, Rudder and Aileron Trim with success. Not so with some of my flying friends..... so as you said, a simulation issue, but now we know, we can trim accordingly.
cheers
chris from oz |
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