The apex seals are not included in the balancing because the rotor is not holding their centrifugal force, the rotor housing is. The same applies to the springs.

 

Richard Sohn
N-2071U

 

 

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

From: rijakits

To: Rotary motors in aircraft

Sent: Monday, June 20, 2005 11:04 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)