Ultra-Prop I & II Solid Carbon Fiber Composite Propellers for Sport Aircraft, Airboats, Hovercraft, VTOL, Drones, Quad Copters, UAV's, Wind Machines and More !

Ultra Prop Propellers

2-blade Ultra Prop 2 ultralight propeller installed and ready to fly

Two-Blade Ultra Prop II ready to Fly!


New Lower-Cost, Adjustable-Pitch, Solid Carbon Fiber
Composite Propellers for Sport Aviation and Air Boating !

Complete Props, Replacement Blades Shipped
Same or Next Day with Your Paid Order !


We ship WORLD-WIDE, the Original Ultra-Prop and the new Ultra-Prop II Solid Carbon Fiber Composite Propellers. Use with belt or gear reduction-drive applications and electric direct-drive. Use with 10 to 150 HP for aircraft, airboats, hovercraft, wind machines and more !    


The Durable Ultra-Prop II is about HALF The COST of other Solid carbon fiber composite, adjustable-pitch propellers !

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The OPTIONAL "Show Prop" Decorative Scheme is Shown
on the 3-Blade and 4-Blade Ultra-Prop II Propellers Above

6-blade 55 inch Ultra Prop II on our customer's hovercraft powered by a 113 hp BMW 1200 RS engine with a Belt drive reduction unit

Above is a picture of 6-blade 55 inch Ultra Prop II on our customer's hovercraft
powered by a 113 hp BMW 1200 RS engine with a gearbox reduction drive unit.

Convert Your Ultra Prop I to Ultra-Prop II if you wish.

A New, Lower Cost Solid Carbon Composite Propeller for Sport Aviators and Air Boaters.

Convert your existing, original Ultra-Prop I to an Ultra-Prop II if you wish by replacing the blades, blade clamping bolts and pitch blocks with Ultra Prop II components. Use your existing Ultra Prop 1 hub.

The Ultra-Prop II is capable of absorbing about 3 times the HP of the original Ultra-Prop 1 for more demanding applications that require more powerful engines. Available with LH or RH blades, pusher or tractor applications.

Here's How to Match the Propeller Blade Pitch to load Engine Power for Maximum Performance and Economy

Adjust the blade pitch angle to fully load your engine at full throttle up to the engine redline rpm, or 50 to 100 rpm below the engine rpm redline. The propeller becomes, or replaces, the engine's rpm "governor".

If for an aircraft, set the maximum full throttle rpm for flying straight and level at your typical cruising altitude.

If for a boat, set prop pitch to limit engine rpm to or just under engine redline rpm when on plane (or as fast as the boat can go) in smooth, calm waters .

Obviously you will need a tachometer connected to your engine. This procedure applies to ALL engines at or just under engine redline rpm turning a propeller to produce maximum possible THRUST per HP!
Ultra-Prop II can be used on all Rotax (2-stroke to 914 4-stroke) and all similar gasoline engines (2 or 4-stroke) using a reduction gearbox or belt drive between the propeller and engine. Electric drives can be direct-drive to propeller. A 6-blade 66 inch Ultra-Prop ll can load 150 HP at 2500 propeller RPM at a useable blade pitch.

Ultra-Prop II Propellers

The Ultra-Prop II can be used on engines from 5 HP to 150+ HP. Each full length blade will absorb 25 to 30 HP at 2500 to 2900 RPM. The designed maximum operating RPM is 2900 at 66 inch diameter. Smaller diameters may turn a little higher RPM if needed.

The Ultra-Prop II uses the same patented blade, hub and pitch block system as the original Ultra-Prop, which has been in continuous production since 1983. It will remain in production and sold here.

The new components of the Ultra-Prop II are the carbon reinforced blade, the pitch blocks and the special blade clamping bolts. The Ultra-Prop II is 66 inches in diameter using the 2, 3 and 4-blade hub; 67 inch diameter with the 5-blade hub and 67-1/2 inches with the 6-blade hub. The blades may be cut to any lesser diameter without need for any special tip finishing or re-balancing. Just measure twice, cut once per blade. We do this for you at no charge if you order a smaller diameter propeller.

The new blade is very stiff solid composite (no foam core, etc.), has a conventional plan form with the appropriate blade twist (helix) and has a highly efficient airfoil.

The carbon reinforced engineering thermoplastic resin blade surface is very hard and durable to withstand abrasion and water impact much better than other blades made or coated with epoxy, paint or other similar 2-part resins. The operating temperature range is minus 60 degrees F to plus 350 degrees F.

Blade pitch range is 8 to 15 degrees at blade root, adjusted in one degree increments by changing pitch block sets. No protractor required! The new engineering structural thermoplastic used is long carbon fiber strand reinforced for high strength, stiffness and low weight. The blades and hub are weather resistant, UV protected and suitable for use on the water and in rain for airboats, hovercraft and Sport or Experimental aircraft such as ultralights, large drones, unmanned aerial vehicles (UAV) homebuilt and kit planes.


Ultra-Prop II Propeller Prices (USD)
      Complete Propeller--Each
2-Blade-$350 (6 Lbs) 
3+ $330 Each

3-Blade-$425 (8 Lbs)
3+ $405 Each

4-Blade-$500 (10 Lbs)
3+ $480 Each

5-Blade-$575 (12 Lbs)
3+ $555 Each

6-Blade-$650 (13 Lbs) 
3+ $630 Each

(20 inch to 67-1/2 inch diameters)

Overall blade length is 31 inches. Blade width is 4.25 inches at mid-blade, tapering to 2 inches at the tip. Weight of full length blade is 1.662 pounds each.


Ultra-Prop II Replacement Parts

Singlet Blade-- $125 each.
3 or more Blades-- $115 each.
6-1/4 inch Diameter Spinner Kit- $65.
Ultra-Prop Faceplate/Crush Plate- $20 each
Extra Pitch Blocks-$9 per blade
Propeller Mounting Bolts, Nuts, Washers set, 8 mm or 5/16 inch-- $20

Plus postage/shipping cost.

Each Ultra-Prop II Propeller Kit includes blades, hub, blade clamping bolts, one set of pitch blocks, plus
Easy to Understand Assembly Instructions


Shipping World-Wide in a Compact Package !

Ultra-Props Suggestion / Quote Form Here

Ultra-Props Order Form Here

No more waiting weeks for complete propellers or replacement blades
all full length blades match in weight, balance and are on the shelf--ready to ship.

Compact, Efficient, Low-Cost, Durable Ultra-Prop II Propeller Air Drive Combinations For Airboats and Hovercraft To 40 HP

1) You supply 22 HP Harbor Freight Predator Engine-4,000 Max. RPM (cost under $600)
Add our bolt-on 1.65 to 1 belt drive--$895
Add our 60 inch 2-blade  Ultra-Prop II with adjustable pitch--$350
121+ pounds thrust typical at full throttle.
2) You supply 22 HP Harbor Freight Predator Engine-4,000 Max. RPM (cost under $600)
Add our bolt-on 1.65 to 1 belt drive--$895
Add our 40 inch 3-blade Ultra-Prop II with adjustable pitch--$425
110+ pounds thrust typical at full throttle.
3) You supply 13 HP Harbor Freight Predator Engine-3600 Max. RPM (cost under $400)
Add our bolt-on 1.4 to 1 belt drive--$895
Add our 40 inch 2-blade Ultra-Prop II with adjustable pitch--$350
70+ pounds thrust typical at full throttle.
NOTE: If you have a Honda, Briggs & Stratton or other engine of similar HP, but limited to 3600 RPM redline, consider our 1.4 to 1 Reduction Ratio
Reduction Drive System. Blade pitch can be adjusted as needed to match/load your actual engine power.


Low Cost Propulsion for Common Engine Applications, 30 to 120 HP, Pusher or Tractor

Call or email us for an Ultra-Prop Propeller Suggestion for your particular application. We will determine the correct pitch block set for your specific application based on the information you provide. Use with Rotax 2 or 4-stroke, Hirth, Simonini, 2si, Compact Radial, Rotec, HKS, Viking, Subaru and many other reduction-drive engines within the power absorbing limits of 10 HP to 150 HP of the Ultra-Prop and Ultra-Prop II.

NOTE: The appropriate Ultra-Prop II propeller for your Rotax engine/gearbox application will NOT exceed the Mass Moment of Inertia limit of your Rotax gearbox !
An engine tachometer is needed to set your blade pitch to its optimum. Disable the engine governor, then set/adjust the prop blade pitch angle of attack to act as the engine governor to limit full throttle maximum engine RPM

Secure Order/Quote Form Here

CONTACT US or email: hoverhawk(at)gnt.net

Our belt reduction drive and PSRU bolt on to common air-cooled engines.

Ultra Props work well with our Belt Reduction Drive unit for Industrial Air-Cooled Engines


Contact Telephone Numbers:

1-251-609-0969 in USA
+1-251-609-0969 outside USA

CONTACT US or email: hoverhawk(at)gnt.net

The Original Ultra-Prop for Mini Airboats, Hovercraft, Trikes, Power Parachutes, Paragliders, Drones, UAV's, VTOL Quad Copters and other Experimental Projects

Ultra Prop ultralight propellers 2-blade, 3-blade, 4-blade, 5-blade and 6-blade. Airboat propeller, 
ultralight propeller, aircraft propeller, flounder boat propeller, bow fishing boat propellers, drone propellers, drone propellers, uav propellers

Original Ultra-Prop I Propeller Prices

Mount original Ultra-Prop direct-drive on B&S, Honda engines, etc. with the flange kit, 2 to 6-bladed props, bolt-on and go!

(20" to 59" diameters available)

2-Blade Propeller  (Model 102)

5.0 lb


3-Blade Propeller  (Model 103)

6.5 lb


4-Blade Propeller  (Model 104)

8.0 lb


5-Blade Propeller  (Model 105)

11.0 lb


6-Blade Propeller  (Model 106)

13.0 lb


Original Ultra-Prop Components Included

Model No. Blades Pitch Blocks Hubs A/N Hardware Hub Spacers
102 2 2 pair 1 pair 4 sets  
103 3 3 pair 1 pair 6 sets  
104 4 4 pair 1 pair 8 sets  
105 5 5 pair 1 pair 10 sets 1 set
106 6 6 pair 1 pair 12 sets 1 set

Go to Propeller Recommendations for the Original Ultra-Prop

Ultra-Prop Facts:

Lowest cost adjustable-pitch prop in the world - 35 years in production - over 17,000 sold - satisfaction guaranteed!
Unique pitch block system holds blades at exact angle -- no protractor required.
Ultra Prop blades are interchangeable -- featuring perfect balance and exceptionally smooth performance.
Ultra Prop 1 Original blades may be used as powered-by-wind turbine blades to generate electricity!

Ultra-Props Suggestion/Quote Request Form Here

Ultra-Props Order Form Here

Ultra-Prop I & II Propeller Components & Accessories

Ultra-Prop Blades

Ultra-Prop Blades - Molded high-strength, glass-reinforced composite. Color: Black. Tip-to-root length: 26-1/4 inches. (Makes a 59" dia. prop including hub). Score lines provided near tips for cutting to smaller custom diameters. All blades identical and interchangeable. Specify left-hand or right-hand rotation. Price: $85 each plus shipping. For original Ultra-Prop only.


Pitch Blocks - Molded high strength, glass-reinforced composite. Grooved faces provide precision alignment with blade root. Color: Black. (Two identical blocks per blade). Separate blocks required for each setting. Block angles from 8 degrees to 18 degrees available in 1 degree increments. Specify pitch. Price: $8.50 per blade {includes (2) halves} for UP1 or $9.50 for UP2 blades., plus shipping.. If you wish, return un-needed pitch blocks for refund or credit after propeller is adjusted as needed.


Universal Hubs - Specify 2, 3, or 4 blade. Molded high-strength glass-reinforced composite with integral steel reinforcing plates. 6-1/2" O.D. Color: Black. Fits 1" diameter centering pilot or optional Rotax 912/914 47 mm centering pilot. Accommodates most mounting plate bolt hole patterns from 2-1/4" to 3-1/4" dia. and 5/16" or 8mm prop mounting bolts. Assembled hub is 2-1/4" thick. (Two identical halves provided per assembly). Price: $85, or $110 for to fit Rotax 912 centering pilot, plus shipping. Use with all Ultra-Props.


5 and 6 Blade Hub Assemblies - High strength steel hub plates for 5 or 6-blade props. Fits 1" diameter center pilot. Six, 5/16" or 8mm prop bolts on a 2 1/4" to 3 1/4" bolt circle. Two plates included per prop hub assembly. Six 5/16" ID x 5/8" OD x 1.85" long steel, tubular spacers included.  Price: $129 each or $150 with 47 mm Rotax 912 centering pilot, plus shipping. Use with all Ultra-Props.


Prop Flange Kit - Kit includes a taper lock bushing and matching modified sprocket to provide the interface between keyed, straight shaft small gas engines and the Ultra-Prop. Also provided is a "crush" or backing plate, mounting hardware and key. Price: $105 plus shipping. Use with all Ultra-Props.


Prop Flange Kit with Pulley - Prop Flange Kit with 6" diameter pulley for driving an alternator. This is a popular setup when a light bank is used for night fishing. Kit includes flange with pulley, taper lock QD bushing, two propeller backup plates, all hardware and key for straight shaft. Price: $145 plus shipping. Use with all Ultra-Props.


New Spinner Kit - For 2, 3 or 4-blade hubs only, includes white 6-1/4 inch polyester spinner, mounting bracket, and all extra hardware for installation. Specify if you use 1/4 inch, 5/16 or 8 mm Propeller mounting hardware. Price: $65 for kit plus shipping. Spinner only- $60. Use with all Ultra-Props.


Replacement Hub Spacers - Six 5/16" ID x 5/8" OD x 1.85" long steel, tubular spacers for 5 and 6 blade hubs. Price: $25 per set of six plus shipping. Use with all Ultra-Props.


A/N Hardware - Blade mounting bolts: AN4-26A (2-3/4" long). Washers: AN960-416. Lock nuts: AN365-428. Price: $6 per set of two plus shipping.
AN4-24A (2- 1/2" long) bolts for 5 and 6-blade props. For original Ultra-Prop only.


Hub Mounting Bolt Sleeves - (Not required for 5/16" or 8mm dia. mounting bolts). High impact plastic or Stainless Steel. Set of 6 sleeves required if using 1/4" mounting bolts. 1/4" ID x 5/16" OD x 2 1/4" long. Price: $8 plus shipping. Use with all Ultra-Props


New Propellers for High-RPM Applications
For Direct-Drive 2-Stroke Engines & Electric Motors

NEW Thrust Props for VTOL, Fixed Wing, Experimental
Aircraft, Airboat, Hovercraft & Drone/UAV Applications

8,000 RPM direct-drive with electric or 2-stroke engines
20 to 36 inch diameters
2, 3, 4, 5 and 6-blade props available
Carbon fiber/Aramid composite construction

3-blade black.jpg (43081 bytes)

2-blade blue.jpg (26303 bytes)

4-blade black.jpg (65233 bytes)

Standard colors are black with yellow or white tips.

Call for more details

Ultra-Props Suggestion-Quote Request Form Here

Ultra-Props Order Form Here

How To Pay For Your Order

Add 2.9% for Merchant Credit Card Fee,
Or pay by Bank Wire Transfer World-Wide, or MoneyGram
Or pay by Check in the USA

OR,  If Paying with Foreign Currency Internationally,
Use TransferWise To Securely Pay for Your Order and SAVE $$$!

NOTE: Our Overseas Customers paying with foreign currency will not pay high bank wire transfer fees or high currency exchange commissions using TransferWise services to pay for their orders. We use them to pay our overseas suppliers, saving us a lot of "wasted" money !! Click HERE to sign up and receive a FEE FREE payment transfer from us (Ron) ! Pay for your order with MC/Visa credit or debit cards or pay by bankwire to TransferWise. This is far less costly than using PayPal, Western Union,  MoneyGram, a traditional bank wire or a credit/debit card payment direct to us, or to any other overseas Vendor/Supplier!


The Ultra-Prop and Ultra-Prop II propeller are manufactured by Competion Aircraft in the USA. Hoverhawk Corporation is an authorized world-wide Distributor/Dealer of their high quality products. The photos and other information posted on this website were provided by Competition Aircraft and is their property.


Prices, specifications, and availability are subject to change without notice. Products and materials advertised on this website are sold with the understanding that the buyer assumes all risks and hazards involved in their use or application. Buyer/User acknowledges assumption of all risks, hazards and further indemnifies seller by purchasing and/or using or reselling the products advertised and sold on this website. No express or implied warranties asserted nor fitness of merchantability claimed by Seller.

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