Term RMS refers to the mathematical Root Mean Square which is an average of peaks and valleys of a materials surface profile. Ra stands for roughness average. Ra is a average of only peaks; therefore, to get an Ra, multiple your 3.2 to 6.3 by 2 to get 6.4 to 12.4 Ra. AF Kenton.
Closest Airport to Siesta Key, FL. The closest airport is Sarasota Bradenton International Airport (SRQ). Distance from Sarasota Bradenton International Airport to Siesta Key is 10,4 kilometers (6,5 miles).
1 Siesta Beach Resort Hotel & Suites is on your left hand side at 5311 Ocean Blvd. 2  Follow signs for 275 South towards St. Petersburg. Watch for 275 South signs as you must merge a few times after exiting the airport.  Continue on I-75 South to exit 205 (Highway 72, aka Clark Rd).