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The R22 corner: Owning, flying & training questions

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The R22 corner: Owning, flying & training questions

Old 7th Feb 2019, 14:28
  #361 (permalink)  
 
Join Date: Sep 2018
Location: California
Posts: 252
Originally Posted by Whiskybravo44 View Post
Hi all,

I am new to the forum and would like to say hi to everyone. The forum seems to have a vast wealth of knowledge and I hope to learn more as I progress.

I do have a question about the R22 mass and balance. My apologies if itís been asked before I did search but maybe I over looked the answer.

My my question is this: what is the arm for lateral mass and balance ?

In in the tech log I have access to then longitudinal arm/moment is calculated for that specific helicopter but there is no mention of lateral arm.

If if anyone could shed some light on this Iíd really appreciate it.

Thanks again 👍

It should be there, right next to the longitudinal arm and empty weight. If not, ask your instructor, 'cause I've never not seen it included in over three dozen R22's.
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Old 7th Feb 2019, 15:01
  #362 (permalink)  
 
Join Date: Feb 2019
Location: Uk
Posts: 4
Originally Posted by GS-Alpha View Post
‘The lateral CG datum is the aircraft centreline with items to the right postitive and items to the left negative.’

On all the R22s I’ve ever flown, the empty lateral CofG had been on the centreline ie the lateral arm has been zero.
yes that is what I was told however there are publications that offer 0.2 -.1 etc. I’ve taken it to be zero also. Thank you for your help
Originally Posted by Robbiee View Post
It should be there, right next to the longitudinal arm and empty weight. If not, ask your instructor, 'cause I've never not seen it included in over three dozen R22's.
ok if you’ve seen it over 36 R22’s what is the lateral arm for the basic empty weight ?
Originally Posted by GoodGrief View Post
Asked your instructor ?
yep I’ve had more than 1 instructor three different answers

should I have?????
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Old 7th Feb 2019, 15:05
  #363 (permalink)  
 
Join Date: Sep 2018
Location: California
Posts: 252
Originally Posted by GS-Alpha View Post
ĎThe lateral CG datum is the aircraft centreline with items to the right postitive and items to the left negative.í

On all the R22s Iíve ever flown, the empty lateral CofG had been on the centreline ie the lateral arm has been zero.


Hmm? I've never seen one that was zero? Most of the one's I've flown were negative, but its the handful that were positive I had to pay more attention to, as with them my calculated cg flying solo would be over the line requiring me to put balast under the passenger seat.
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Old 7th Feb 2019, 16:06
  #364 (permalink)  
 
Join Date: Jul 2004
Location: Germany
Posts: 785
Is the lateral moment given for the weight in that tech log ?
GoodGrief is offline  
Old 7th Feb 2019, 16:39
  #365 (permalink)  
 
Join Date: Mar 2016
Location: UK
Posts: 16
There is more information in the POH/PFM/RFM section 6. 6-6 i think.

A lot of R22s are different so there should be a lateral on the weight/mass schedule.
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Old 8th Feb 2019, 03:47
  #366 (permalink)  
 
Join Date: Sep 2018
Location: California
Posts: 252
Originally Posted by Whiskybravo44 View Post
...if youíve seen it over 36 R22ís what is the lateral arm for the basic empty weight ?
Well for the last five 22's I've flown its been, 0.6, 0.58, -0.7, -0.3, and another -0.7

Thing is, even if it were zero, it should say, Lateral CG 0
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Old 8th Feb 2019, 16:44
  #367 (permalink)  
RMK
 
Join Date: Aug 2008
Location: London
Posts: 197
For a R22 Beta II the lateral arm is as follows:

PIC Seat (& baggage compartment) 10.7
PAX seat (& baggage compartment) -9.3

Multiply the weights of each person/baggage and you have your lateral moments
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Old 8th Feb 2019, 21:35
  #368 (permalink)  
 
Join Date: Sep 2018
Location: California
Posts: 252
Originally Posted by RMK View Post
For a R22 Beta II the lateral arm is as follows:

PIC Seat (& baggage compartment) 10.7
PAX seat (& baggage compartment) -9.3

Multiply the weights of each person/baggage and you have your lateral moments
Those are not the lareral arm of the empty helicopter, only the arms of the seats. You'll need more info if you want a proper weight and balance calculation.
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Old 9th Feb 2019, 05:34
  #369 (permalink)  
 
Join Date: Sep 2002
Location: Great South East, tired and retired
Posts: 2,755
Multiply the weights of each person/baggage and you have your lateral moments
...and then divide by the total weight to get the arm of the CG, after you have done the same with the empty aircraft, and the fuel on board, and the stuff under the seat.
Ascend Charlie is offline  
Old 18th May 2020, 21:36
  #370 (permalink)  
 
Join Date: May 2020
Location: UK
Posts: 1
Hey folks - looking for a UK/Ireland based R22 for dry lease for 3-6 months this year ideally (once restrictions are lifted). If anyone would like to discuss or has any leads please PM me!.

Thanks

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