| Action Bob |
Personally my campaign uses these rules as there are not sufficient rules dictated in the book we gathered all the relevant information and extrapolated the best reference document we could, this is an excerpt of that document THIS IS NOT OFFICIAL but it could work for you.
Relevent Referance pages:
http://paizo.com/pathfinderRPG/prd/coreRulebook/skills/fly.html#fly
http://paizo.com/pathfinderRPG/prd/coreRulebook/spells/fly.html#fog-cloud
http://paizo.com/pathfinderRPG/prd/coreRulebook/additionalRules.html#table- 7-4-carrying-capacity
http://www.d20pfsrd.com/skills/ride
http://www.d20pfsrd.com/equipment---final/goods-and-services/animals-animal -gear
Barding:
Flying mounts can't fly in medium or heavy barding. (Due to loss of range of motion and balance during aerobatic maneuvers)
Barding for a flying mount can only cover the head, neck, chest, body, legs and rigid components of the wing when "Barding Stitches" are used, all str and dex check penalties apply.
Removing and fitting barding takes five times as long as the figures given on Table: Donning Armor.
A barded animal CANNOT BE USED TO CARRY ANY LOAD other than a rider and normal saddlebags.
http://www.d20pfsrd.com/equipment---final/goods-and-services/animals-animal -gear
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"Bigger and Smaller Creatures: The figures on Table: Carrying Capacity are for Medium bipedal
creatures. A larger bipedal creature can carry more weight depending on its size category, as follows:
Large ×2, Huge ×4, Gargantuan ×8, Colossal ×16. A smaller creature can carry less weight depending on
its size category, as follows: Small ×3/4, Tiny ×1/2, Diminutive ×1/4, Fine ×1/8.
(Treating creatures with two wings as a biped)
Animal: Can carry up to:
An eagle (small animal, str 10) [3/4*100=75] lbs in flight.
A tame Roc (medium / large, str 12 or 20) [1*130=130 or 2*400=800] lbs in flight.
A wild Roc (gargantuan animal, str 28) [8*1200=9600] lbs in flight.
Quadrupeds can carry heavier loads than bipeds can. Multiply the values corresponding to the
creature's Strength score from Table: Carrying Capacity by the appropriate modifier, as follows: Fine
×1/4, Diminutive ×1/2, Tiny ×3/4, Small ×1, Medium ×1-1/2, Large ×3, Huge ×6, Gargantuan ×12,
Colossal ×24."
(Treat creatures with four wings as a quadroped)
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Therefore;Flying under load:
Light:
No reduction
No minus
Medium:
flight speed reduced
(if 80 is now 55)
-3 to fight check penalty
Heavy: (glide only)
flight speed reduced
-6 flight check penalty