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Just A Little Faster Please TECHNIQUES FOR SPECIFIC SITUATIONS Classic Macready TheoryAssumptions All thermals same strength at all altitudes.
Strength of next thermal is known Interthermal sink lift is assumed constant Three Pilots Hair on fire Pilot C Namby pamby Pilot B.
Ollie Optimal Pilot A PRINCIPLE OF OPTIMIZATION Classic Macready Theory Optimal inter thermal speed for maximumaverage cross country speed can be.
calculated Effect of inter thermal sink lift essentiallysubtracts from adds to achieved climb rate Effect of Headwind Tailwind none excepton final glide.
Water ballast shifts polar down to right Put in an anticipated thermal strength apolar and a wing loading to the on boardcomputer and a speed to fly emerges as atone and needle indication.
PROBLEMS WITH MACREADY Don t know next climb rate Climb rate varies with altitude And time to center the climb achieved climb rate Don t know sink lift between thermals varies.
constantly Wil Schuemann renaissance soaring man Total energy compensation box Water ballast Winglets.
Discus plan form Seminal paper on modified MacCready flight Soaring symposia 1972 see references The Price You Pay For Macreadyby Wil Schuemann.
Cruise speed vs achieved Average speed minimal difference 8 to10 knots Big difference at best L D Effect on range does slower speedincrease range Yes with respect to.
airmass more range larger chance to findspecial thermal Remember Pilot B Who would you rather be if you don tknow where the next thermal is Flying MaCready accurately ain t.
What is the next achieved thermal strength Chasing the needle may do more damage than Control drag Non optimal G loading Damp out airframe responses.
Scare the s out of fellow pilots Distracts from other tasks Lessons learned Speed variations 8 10 knots from ideal Macreadyminimal impact on ave x c speed.
Speeding in sink gains little Range gained with slowing But perfect speed adherence would give slightlyhigher speeds Schuemann s conclusions.
A moderate speed with little variation costs verylittle speed Reducing MacCready intensity yields more timeto think And look outside Increasing range may improve thermal selection.
Slower flight makes air easier to assess John Cochrane PHD economics U of Chicago dept Finance Highly successful competition pilot Regular contributor to Soaring magazine.
Just A Little Faster PleaseJohn Cochrane Speed and modern MacCready theory observations MacCready still key to in flight speed decisions.
MacCready determines cruise speed themathematical solution is still valid But what is the correct MacCready value Reichmann s elliptical thermal lift concept bottom and top areusually less than mid level climb rate.
Likelihood of finding best thermals goes down with altitude Random lift distribution curve plotted against Assumes thermals vary in strength quite a bit There are many weak thermals to use to save aflight low.
There are a few really good thermals Seems to fit with pilots real worldobservations Proper MacCready setting driftsdown as glider gets lower.
John Cochrane CENTERING TIME AT THERMAL ENTRY Often several circles Dilutes average rate of climb Makes stopping for short climbs less efficient.
Longer down low and on windy days Effect larger for strong thermals Supports trying to pick easily centered thermals Implications for Flying Tactics Recognize that thermals are variable.
Steadily reduce MacCready as altitude lower Leave weak thermals to search as get higher Average MacCready much lower than best Always adjust MacCready to expected future save altitude now .
DJ Practical Observations In a modern glass ship Fly 60 70 knots if nervous Fly 80 knots if feels OK Fly 90 100 knots if great day.
MaCready on 2 and leave it alone No zoomies gentle pull ups and pushovers tofeel the air Concentrate instead on following the max energy Other observations .
Flying Energy Paths Well Formed Cu s Isolated or random cumulus cloudsread tops as well as bottoms Cumulus congestus.
Cruising techniques Cruising with cumulus clouds Classic Streets Speed to fly MacCready still applies Altitude higher better but need to see.
Deviation angles up to 30 degrees occ more Bridging to next street Often best speed will cause falling away from clouds End of street planning Get high.
Cruising techniques Make your Even a randompattern of dots Optimize the.
time spent in the Fully utilize theclouds you have Departing the Cloud When the lift drops off not necessarily at.
cloudbase Want to maximize average climb plan ahead while you re topping out speed choices maximize the weak lift use the rest of the cloud.
look for bridges to next energy path step Ideally should have idea where next stop When to stop in general Long cruise legs reduce centering loss No point in stopping high centering time.
Set a height band floor usually top 30 40 of thermal Below 50 lift begins to disconnect from Try to end streets high Understand the thermal strength profile for.
the day changes with height Big Blue Holes Assess why blue Lake sea shadow Airmass change.
Wave influence High wind streeting Get high and try to stay high Go slow until you ve had time forassessment may be good but dry or not .
Look for gliders good thermal markers Blue thermal cruising Read the ground Streeting prominent on blue days Wind direction key .
Wind arrow on Ilec or GNII etc Streets almost always on the wind Feel for the lines of lift and do thiscontinuously Deviate onto the lines of lift energy paths .
Blue thermal cruising Go slower greater range when weak Practice centering lines of lift on blue days Feel for asymmetric lift and make smallturns into it.
Try to sustain reduced sink canaugment achieved L D substantially extend range lead to a thermal Weak blue day strategy Greater uncertainty warrants more conservative.
Find some company 3 5 gliders not 20 Spread out when cruising with other gliders don thide behind Lift asymmetries and lift lines lead to thermal Read the ground.
When to slow up changing gears Cochrane s theory progressive When going from cu to blue Approaching overdeveloped area.
Cirrus overcast ahead Known or visible wet area ahead lake knownshower history standing water Multiple low gliders ahead Lots of whining on the radio.
No see um s ahead Low saves Go slow for max range Look for birds other gliders dust devils ridges rock piles fire smoke edge of lake.
Take anything and work its edges especially up wind be patient Quit at a safe altitude know your limits Water ballast Adjustable wing loading.
Slows climb directly increased circle speed anddiameter farther away from core Improves glide performance greater range ave Rule of thumb keep water if ave lift 350 ft min Especially helpful on long streets ridges.
Water ballast use cont Don t dump too soon May need to dump a portion Low saves Thermals generally small in diameter.
Don t dump in gaggle thermals Water ballast cont Check your system Practice before you go to a contest Loading s a hassle.
Flies differentlyAdds an interesting element of complexity What we really do Conservative MacCready dictates ave Speed Plan ahead WAY AHEAD.
Not a lot of zooming gentle speed changes Slower with lower highly variable Major emphasis on best track thus improved L D Extreme emphasis on finding best thermals Leave mediocre thermals as soon as safe.
What we do cont Major deviations are the norm Do what it takes to avoid out landings Remember the sky usually is not falling Have fun don t obsess about falling behind.
Everybody has a bad day sometime Practice practice practice Fly for speed every time you fly Get better Recommended reading.
Cross Country Soaring Helmut Reichmann Introduction To Cross Country Soaring Kaihttp www flsc org XCountry Cro... The Price You Pay For MacCready Speeds Wil Schuemann http www betsybyars com .
guy soaring symposia Just A Little Faster Please john Cochranehttp faculty chicagogsb edu jo... research Papers maccready Let s fly.
The endWind arrow on Ilec or GNII, etc Streets almost always on the wind Feel for the lines of lift and do this continuously Deviate onto the lines of lift (energy paths) Blue thermal cruising Go slower?– greater range when weak and blue Practice centering lines of lift on blue days Feel for asymmetric lift, and make small turns into it Try to ...

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