----- Original Message -----

From: Leon

To: Rotary motors in aircraft

Sent: Monday, June 20, 2005 4:19 PM

Subject: [FlyRotary] Apex Seals & Balancing was Re: [FlyRotary] Re: Weights

Hi Thomas,

 

Richard Sohn is on the case.  He already posted the answer.  The apex seals and springs are suported by the trochoid at all times,  and don't act on the eccentric shaft assy.  The whole trick to getting the balance right is the oil mass allowance.

 

Cheers,

 

Leon

----- Original Message -----

From: rijakits

To: Rotary motors in aircraft

Sent: Tuesday, June 21, 2005 4:04 AM

Subject: [FlyRotary] Re: Weights

Quich question to balancing:

 

Though your list is not specifically pointed to balancing.

For a dynamic balance job DO YOU  or DO YOU NOT include the weight of the apex-seals?

Apparently they should not bear on the rotor/excenter of the shaft, as the rotorhousing carries their weight at all times.

 

Am I missing something?

 

Leon?

 

Thomas J.

----- Original Message -----

From: George Lendich

To: Rotary motors in aircraft

Sent: Monday, June 20, 2005 6:18 AM

Subject: [FlyRotary] Weights

Rusty,

Here's some very accurate weights for your records-

Apex corner seals x6 = 19grams

Apex corner seal springs x 6 = 1 gram

Side seal springs x6 =1 gram

Side seals x6 = 25grams

Oil seal springs x4 = 10 grams

Oil seal retainers( metal) x4 = 92 grams

Oil 'O' rings x4 = 16 grams

 

Total of 164 grams ( 5.784936 oz)

 

Weighed all together 164 grams ( as a check for accuracy)

 

RX8 Rotor 9.3346lbs( 4243 grams)

 

I just can't see how you get 10 lb 9 oz rotor weight comparing these weights, even though the RX7 rotors are a tad heavier!

 

BTW Tracy's apex seals are 30 grams.

George ( down under)