Question 1

is this prop for electric motors?

Accepted Answer

It will work fine with an electric motor. You must have enough power to drive it at a reasonable speed or your motor will overheat due to lack of adequate cooling air.  This applies to a fuel powered engine as well.

Question 2

facing the engine what is the rotation of the prop ( right or left) thanks

Accepted Answer

Honestly never paid any attention to that aspect. Just make sure that the rotation is forcing air to the rear. This prop is one of a pair of counter rotating props and I believe it rotates in the opposite direction of a normal (tractor) prop,  which if you were facing the engine would be right to left. Not certain, so wait to see if you get an answer from a person more confident than myself.

Question 3

what material is this? nylon coated fiberglass or fiberglass or nylon?

Accepted Answer

TECH NOTES    This is the Master Airscrew 12x8 3-Blade Glass Filled Nylon Propeller.             Ideal for .90-1.08 cu in (14.7-27.4cc) size airplane engines.                                                                                         FEATURES: Factory balanced, NACA airfoils create a greater thrust at lower                 RPM                                                                          Excellent for any type of application, from training and sport flying            to serious competition                                                                                                                            INCLUDES: One Master Airscrew 12x8 3-Blade Glass Filled Nylon Propeller                                                                                       SPECS:    Diameter: 12" (305mm)                                                          Pitch:     8" (203mm)                                                                                                                               COMMENTS: The general rule for converting from two blades to three is to                   decrease diameter by 1" and increase pitch by 1"                             PER MASTER AIRSCREW: All 3 blade props are balanced dynamically at               the factory prior to drilling. The mounting holes are then drilled             slightly off center, if required, to properly balance the                      propeller. As such, the mounting hole may be slightly off center.              Master Airscrew assures us this is perfectly normal and will not               cause any problems during usage.

Question 4

Is this for a single prop or a pair?  $20 for a $12 prop.  Am I missing something?

Accepted Answer

12 dollar prop, plus 2 day shipping on master airs crews website brings it to 22 dollars total.

ASIN	B0000WS5SC
Age Range Description	16+ Years
Best Sellers Rank	#78,764 in Toys & Games ( See Top 100 in Toys & Games ) #1,290 in Hobby Remote & App Controlled Vehicle Parts
Brand Name	Master Airscrew
Color	Black
Customer Reviews	4.5 out of 5 stars 535 Reviews
Educational Objective	RC Plane Piloting
Global Trade Identification Number	00607370951385
Included Components	Adapter rings, propellers
Indoor Outdoor Usage	Outdoor
Item Dimensions	12 x 12 x 0.5 inches
Item Type Name	Propeller
Item Weight	2.08 ounces
Manufacturer	Master Airscrew
Manufacturer Part Number	MAS1380T
Manufacturer recommended age	16 years and up
Material Type	Plastic
Model Number	MAS1380T
Number of Packs	1
Operation Mode	Manual
Set Name	13x8 3-Blade
Size	13x8 N
Supported Battery Types	No batteries required
Theme	Model R/C Plane Performance Improvement
UPC	607370951385
Unit Count	1 Count

Master Airscrew 3-Blade 13x8 Performance Propeller - Normal/Tractor/CCW

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Specifications

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