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Our Telephone Number:
1-251-609-0969 in United States
+1-251-609-0969 outside United States
Contact Us Here: hoverhawk (at) gnt.net
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Click Here to request
a Prop/Fan
suggestion & cost quote--Or to place your order
Note1: The following fans are just a few of the possible combinations that are available from us, with stated diameters, type and estimated performance outputs. We can also build a custom fan configuration for your application. Provide us with the details in an email to hoverhawk (at) gnt.net and we will find the best fan or propeller combination for your application. If your duct is already constructed, we can cut the fan diameter to fit with the proper blade-tip clearances for maximum efficiency.
Note2: The fan performance calculations published below uses 4 inches of water gauge (in. wg.) static pressure, or 997 Pascals, as the default pressure for the air cushion, which is more than adequate. This supports up to 20.8 pounds per square foot of aircushion area or 101.6 kilograms per square meter , unless otherwise stated, A 0.5 in. wg. static pressure for thrust fans is also assumed, using an AMCA style "A" duct, 0.5% of fan diameter for blade tip/duct wall clearance for pressure fans and 1% of fan diameter for blade tip/duct wall clearance for thrust fans. A Taper-lock bushing is included to mount the fan to your keyed engine PTO or drive shaft. Flange-style mounting is also available upon request. Just tell us what you want. Expect about 10% less performance if a properly shaped duct is not used, or if no duct is used, or if there is excessive blade tip clearance to the duct wall.
Note3: We suggest you ONLY use our Hovercraft Lift Calculator at 0.50 inch (1/2") or 0.25 inch (1/4") hover height to determine the airflow in CFM for your hovercraft air cushion application, based on its weight, the length and width of the air cushion area. Ignore the ESTIMATED FAN DIAMETER and the ESTIMATED LIFT ENGINE POWER calculator outputs for fan selection purposes. Find the "CFS" (cubic feet per second) output, then multiply times 60 to convert to CFM (cubic feet per minute). Then find a fan below that closely matches the CFM you require or the HP you have available. Always deduct 15% from the advertised engine HP to get a real-world reliable value for YOUR engine. It is suggested to plan for 10% to 15% more HP than your calculations show is minimally required to account for hot days, high-density altitude, and so your engine may operate at less than Wide Open throttle settings. Always have more power and airflow than you need instead of needing more power and airflow than you have. Think ahead, plan ahead !! If you do not see a suitable fan below, call or email us. There are thousands more combinations available !
Products and Services We Offer
Belt Reduction Air Drives for
Hovercraft and Airboats
Hovercraft
Skirt Fabric and Adhesive
Low Cost Air-Cooled
Diesel and Gas Engine Sources
Sale! Inflatable Heavy Duty Boats, Kayaks,
Dinghies, River Rafts Sale!
Hovercraft Aircushion
Calculator
Propeller and Fan Tip Speed Calculator
Visit OUR Other Websites for Even More
Propeller Solutions
Bolly Hovercraft, Airboat and Aircraft Propellers
Original and
Ultra-Prop ll Propellers and Parts
Useful Links to More Propulsion Knowledge
Why Use A Ducted Propeller Or Ducted Fan?
How to get 130 pounds of Thrust with only
12 HP
The VTOL Hiller Flying Platform--Build Your
Own !
The Hiller 1031-A-1 Flying Platform
Picture Courtesy of Smitsonian National Air and Space Museum
Email Us Here hoverhawk (at) gnt.net for answers to your questions
NEW
Thrust Props for VTOL, Fixed Wing, Experimental
Standard colors are black with yellow tips
Call or Email for more details
Our Telephone Numbers:
1-251-609-0969 in United States
+1-251-609-0969 outside United States
Contact Us by Email: hoverhawk (at) gnt.net
[Replace (at) with the symbol]
Below are Examples of the many Multi-Blade Props/Fans We Offer
1
0-blade Type 3 hovercraft fan with polyamide heavy duty blades
9-blade Type 4 hovercraft fan with polyamide heavy duty blades
9-blade Type 4 hovercraft fan with polyamide blades
6-blade Type 5 hovercraft fan with polyamide blades
THRUST FANS for Hovercraft, Fan Boats, Airboats, Bowfishing, Flounder Boats......22 inch diameter, Type 3, 8 blades, 3600
rpm, at stated blade pitch produces:
25 degrees, 9250 CFM, 17.5 pounds, using 4.7 HP
30 degrees, 11,500 CFM, 23 pounds, using 6.5 HP
35 degrees, 14,700 CFM, 34 pounds, using 9.7 HP
40 degrees, 16,600 CFM, 41 pounds, using 12.6 HP
45 degrees, 19,500 CFM, 54 pounds, using 18.4 HP
50 degrees, 21,400 CFM, 64 pounds, using 23.3 HP
Weight, 5 pounds, Cost $179 USD plus shipping.
24 inch diameter, Type 3, 4 blades in
8-blade hub, 3600 rpm, at stated blade pitch produces:
25 degrees, 9480 CFM, 17.5 pounds, using 3.5 HP
30 degrees, 12,000 CFM, 23 pounds, using 5.5 HP
35 degrees, 15,400 CFM, 33 pounds, using 8 HP
40 degrees, 17,00 CFM, 39 pounds, using 10.5 HP
45 degrees, 20,100 CFM, 50 pounds, using 15 HP
50 degrees, 21,800 CFM, 58 pounds, using 18 HP
Weight, 5 pounds, Cost, $139 USD plus shipping.
26 inch diameter, Type 4, 5 blades, 3600
rpm, at stated blade pitch produces:
25 degrees, 18,500 CFM, 40.1 pounds, using 11.4 HP
30 degrees, 23,000 CFM, 57.4 pounds, using 18.6 HP
35 degrees, 26,600 CFM, 73.8 pounds, using 26.7 HP
40 degrees, 30,100 CFM, 91.0 pounds, using 36.6 HP
45 degrees, 32,600 CFM, 105 pounds, using 47.6 HP
Weight, 9 pounds, Cost $245 USD plus shipping
32 inch diameter, Type 4, 8 blades, 3100
rpm, at stated blade pitch produces:
25 degrees, 30,100 CFM, 68 pounds, using 26.7 HP
30 degrees, 36,800 CFM, 94.6 pounds, using 37.8 HP
35 degrees, 42,800 CFM, 124 pounds, using 53.7 HP
40 degrees, 49,400 CFM, 160 pounds, using 75.4 HP
45 degrees, 54,500 CFM, 191 pounds, using 100 HP
Weight, 9 pounds, Cost $385 USD plus shipping.
28 inch diameter, Type 4, 3 blades in
6-blade hub, 3600 rpm, at stated blade pitch produces:
25 degrees, 22,400 CFM, 49.7 pounds, using 12.2 HP
30 degrees, 26,500 CFM, 65.4 pounds, using 17.8 HP
35 degrees, 30,200 CFM, 82 pounds, using 25.4 HP
40 degrees, 33,400 CFM, 97.5 pounds, using 34 HP
45 degrees, 35,600 CFM, 109 pounds, using 42.8 HP
Weight, 9 pounds, Cost $220 USD plus shipping.
31.5 inch diameter, Type 4, 3 blades in
6-blade hub, 3200 rpm, at stated blade pitch produces:
25 degrees, 23,900 CFM, 49.8 pounds, using 10.9 HP
30 degrees, 29,200 CFM, 67.2 pounds, using 16.3 HP
35 degrees, 33,800 CFM, 85.8 pounds, using 23.1 HP
40 degrees, 37,500 CFM, 102 pounds, using 31.7 HP
45 degrees, 40,000 CFM, 114 pounds, using 40.3 HP
Weight, 9 pounds, Cost $220 USD plus shipping.
41.8 inch diameter, Type 5, 6 blades, 2600
rpm, at stated blade pitch produces:
25 degrees, 34,600 CFM, 91.3 pounds, using 21.7 HP
30 degrees, 47,800 CFM, 129 pounds, using 35.8 HP
35 degrees, 59,700 CFM, 174 pounds, using 53.0 HP
40 degrees, 71,100 CFM, 226 pounds, using 76.1 HP
45 degrees, 79,400 CFM, 269 pounds, using 101 HP
50 degrees, 88,400 CFM, 331 pounds, using 136 HP
Weight, 8 pounds, Cost $385 USD plus shipping.
32 inch diameter, Type 4, 4 blades in
8-blade hub, 3100 rpm, at stated blade pitch produces:
25 degrees, 28,800 CFM, 63.8 pounds, using 18.8 HP
30 degrees, 34,100 CFM, 83.1 pounds, using 27.0 HP
35 degrees, 39,400 CFM, 106 pounds, using 38.1 HP
40 degrees, 43,200 CFM, 125 pounds, using 51.2 HP
45 degrees, 46,400 CFM, 142 pounds, using 65.2 HP
Weight, 8 pounds, Cost $275 USD plus shipping.
31.5 inch diameter, Type 4, 6 blades, 3200 rpm, at stated
blade pitch produces:
25 degrees, 25,500 CFM, 68.3 pounds, using 19.1 HP
30 degrees, 32,200 CFM, 91.0 pounds, using 27.7 HP
35 degrees, 38,100 CFM, 117.0 pounds, using 39.0 HP
40 degrees, 44,200 CFM, 148 pounds, using 55.3 HP
45 degrees, 49,100 CFM, 175 pounds, using 73.2 HP
Weight, 9 pounds, Cost $329 USD plus shipping.
41 inch diameter, Type
5, 3 blades in 6-blade hub, 2700 rpm, at stated blade
pitch produces:
30 degrees, 46,500 CFM, 81 pounds, using 21.8 HP
35 degrees, 55,700 CFM, 115 pounds, using 32.6 HP
40 degrees, 63,100 CFM, 148 pounds, using 46.8 HP
45 degrees, 69,800 CFM, 175 pounds, using 63.4 HP
50 degrees, 72,600 CFM, 190 pounds, using 84.5 HP
Weight, 8 pounds, Cost $295 USD plus shipping.
45 inch diameter, Type 5, 4 blades in 8-blade hub,
2500 rpm, at stated blade pitch produces:
25 degrees, 46,800 CFM, 69 pounds, using 24 HP
30 degrees, 60,800 CFM, 112 pounds, using 35 HP
35 degrees, 72,300 CFM, 160 pounds, using 53 HP
40 degrees, 83,300 CFM, 213 pounds, using 75 HP
45 degrees, 90,300 CFM, 247 pounds, using 100 HP
50 degrees, 96,700 CFM, 287 pounds, using 128 HP
Weight, 8 pounds, Cost $385 USD plus shipping.
Replacement Blades-Specify LH or RH Rotation
Type 3 blades are $15 each
Type 4 blades are $35 each
Type 5 blades are $42 each
Black Super-Tuff Blades
Type 4 blades are $53 each
Type 5 blades are $60 each
Add $20 per blade to fan price for Super-Tuff blades
16 inch diameter, Type 3,
6 blades, 3900 rpm, 18.2 PSF, at stated blade pitch produces:
25 degrees, 2,240 CFM, requiring 2.3 HP
30 degrees, 2,910 CFM, requiring 3.1 HP
35 degrees, 4,130 CFM, requiring 4.3 HP
40 degrees, 4,830 CFM, requiring 5.2 HP
45 degrees, 5,640 CFM, requiring 6.5 HP
50 degrees, 5,980 CFM, requiring 7.6 HP
Weight, 5 pounds, Cost $169 USD plus shipping.
20 inch diameter, Type 3, 6 blades, 3800
rpm, 20.8 PSF, at stated blade pitch produces:
25 degrees, 3,400 CFM, requiring 3.9 HP
30 degrees, 5130 CFM, requiring 5.7 HP
35 degrees, 7230 CFM, requiring 8.2 HP
40 degrees, 8620 CFM, requiring 10.2 HP
45 degrees, 10,700 CFM, requiring 13.6 HP
50 degrees, 11,600 CFM, requiring 16.2 HP
Weight, 5 pounds, Cost $169 USD plus shipping.
22 inch diameter, Type 3, 8
blades, 3600 rpm, 20.8 PSF, at stated blade pitch produces:
25 degrees, 5160 CFM, requiring 5.7 HP
30 degrees, 7350 CFM, requiring 8 HP
35 degrees, 10,300 CFM, requiring 11.8 HP
40 degrees, 12,100 CFM, requiring 15 HP
45 degrees, 14,700 CFM, requiring 20 HP
50 degrees, 16,100 CFM, requiring 23.5 HP
Weight, 5 pounds, Cost $179 USD plus shipping.
(Can turn up to 3800 RPM)
24 inch diameter, Type 3, 8 blades, 3600
rpm, 20.8 PSF, at stated blade pitch produces:
25 degrees, 5800 CFM, requiring 6.6 HP
30 degrees, 8780 CFM, requiring 9.5 HP
35 degrees, 12,200 CFM, requiring 14.4 HP
40 degrees, 14,700 CFM, requiring 18.5 HP
45 degrees, 18,100 CFM, requiring 25.6 HP
50 degrees, 20,600 CFM, requiring 31 HP
Weight, 5 pounds, Cost $179 USD plus shipping.
26 inch diameter, Type 3, 10 blades, 3600
rpm, 20.8 PSF, at stated blade pitch produces:
25 degrees, 10,700 CFM, requiring 12.7 HP
30 degrees, 14,600 CFM, requiring 18.1 HP
35 degrees, 18,700 CFM, requiring 16.1 HP
40 degrees, 22,700 CFM, requiring 34.4 HP
45 degrees, 27,000 CFM, requiring 46.7 HP
50 degrees, 30,100 CFM, requiring 57.6 HP
Weight, 5 pounds, Cost $225 USD plus shipping
27 inch diameter, Type 3, 12 blades, 3200
rpm, 20.8 PSF, at stated blade pitch produces:
25 degrees, 8,860,700 CFM, requiring 10.6 HP
30 degrees, 12,500 CFM, requiring 14.8 HP
35 degrees, 17,200 CFM, requiring 22.2 HP
40 degrees, 20,100 CFM, requiring 28.6 HP
45 degrees, 25,200 CFM, requiring 39.3 HP
50 degrees, 27,900 CFM, requiring 47.7 HP
Weight, 5 pounds, Cost $289 USD plus shipping.
20 inch diameter, Type 3, 8 blades, 3800
rpm, 20.8 PSF, at stated blade pitch produces:
25 degrees, 4740 CFM, requiring 5.5 HP
30 degrees, 6,630 CFM, requiring 7.4 HP
35 degrees, 9010 CFM, requiring 10.7 HP
40 degrees, 10,600 CFM, requiring 13.3 HP
45 degrees, 12,400 CFM, requiring 17.7 HP
50 degrees, 13,200 CFM, requiring 20.5 HP
Weight, 5 pounds, Cost $179 USD plus shipping.
23 inch diameter, Type 3, 6 blades, 3600
rpm, 20.8 PSF, at stated blade pitch produces:
25 degrees, 3,930 CFM, requiring 4.5 HP
30 degrees, 6,650 CFM, requiring 7 HP
35 degrees, 9,120 CFM, requiring 10.4 HP
40 degrees, 11,106 CFM, requiring 13.3 HP
45 degrees, 14,200 CFM, requiring 17.7 HP
50 degrees, 1,500 CFM, requiring 21.4 HP
Weight, 5 pounds, Cost $169 USD plus shipping.
(Can turn up to 3800 RPM)
26 inch diameter, Type 4, 6 blades, 3600
rpm, 20.8 PSF, at stated blade pitch produces:
25 degrees, 13,200 CFM, requiring 15.7 HP
30 degrees, 16,200 CFM, requiring 20.9 HP
35 degrees, 18,800 CFM, requiring 26.9 HP
40 degrees, 21,400 CFM, requiring 35.3 HP
45 degrees, 23,700 CFM, requiring 43.9 HP
Weight, 5 pounds, Cost $255 USD plus shipping.
26 inch diameter, Type 4, 5 blades, 3600
rpm, 20.8 PSF, at stated blade pitch produces:
25 degrees, 13,100 CFM, requiring 14.7 HP
30 degrees, 17,900 CFM, requiring 21.6 HP
35 degrees, 21,500 CFM, requiring 29.2 HP
40 degrees, 24,500 CFM, requiring 37.3 HP
45 degrees, 26,800 CFM, requiring 46.8 HP
Weight, 8 pounds, Cost $245 USD plus shipping.
22 inch diameter, Type 4, 5 blades, 3600
rpm, 20.8 PSF, at stated blade pitch produces:
25 degrees, 7880 CFM, requiring 9.1 HP
30 degrees, 10,100 CFM, requiring 12.3 HP
35 degrees, 12,600 CFM, requiring 16.3 HP
40 degrees, 14,300 CFM, requiring 20.6 HP
45 degrees, 15,600 CFM, requiring 25 HP
Weight, 8 pounds, Cost $245 USD plus shipping.
26 inch diameter, Type 5, 6 blades, 3600
rpm, 20.8 PSF, at stated blade pitch produces:
25 degrees, 15,900 CFM, requiring 19.2 HP
30 degrees, 20,200 CFM, requiring 26.4 HP
35 degrees, 23,900 CFM, requiring 35.7 HP
40 degrees, 27,000 CFM, requiring 46.1 HP
45 degrees, 30,300 CFM, requiring 58.9 HP
Weight, 8 pounds, Cost $395 USD plus shipping
32 inch diameter, Type 5, 8 blades, 2900
rpm, 20.8 PSF, at stated blade pitch produces:
25 degrees, 26,300 CFM, requiring 26.3 HP
30 degrees, 26,900 CFM, requiring 36.8 HP
35 degrees, 33,200 CFM, requiring 51.1 HP
40 degrees, 38,400 CFM, requiring 65.2 HP
45 degrees, 43,300 CFM, requiring 83.6 HP
Weight, 8 pounds, Cost $475 USD plus shipping
30 inch diameter, Type 5, 7 blades, 3000
rpm, 20.8 PSF, at stated blade pitch produces:
25 degrees, 16,600 CFM, requiring 19.1 HP
30 degrees, 21,500 CFM, requiring 26.9 HP
35 degrees, 27,000 CFM, requiring 37.3 HP
40 degrees, 31,800 CFM, requiring 49.1 HP
45 degrees, 36,200 CFM, requiring 62.4 HP
Weight, 8 pounds, Cost $445 USD plus shipping
Replacement Blades- LH or RH Rotation
Type 3 blades are $15 each
Type 4 blades are $35 each
Type 5 blades are $42 each
Black Super-Tuff Blades
Type 4 blades are $53 each
Type 5 blades are $60 each
Add $20 per blade to fan price for the black Super-Tuff blades
Type 3 fans have fixed pitch (specify blade pitch), Type 4 and Type 5 Fans have adjustable blade pitch.
If you do not find the mini airboat or Hovercraft prop/fan that suits your needs, please contact us.Please Note the Meaning of Terms Used on this Site:
In. Wg. (inwg) = Inches of Water Gauge pressure
4 In.Wg = 20.8 PSF or 997 Pascals or 101.6 Kg. per M.Sq.CFS = Cubic Feet Per Second
CFM = Cubic Feet Per Minute
PSF = Pounds Per Square Foot
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Contact Us Here: hoverhawk (at) gnt.net
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Original & NEW Ultra Prop II for Mini Airboats and Hovercraft
6-blade 55 inch Ultra Prop II propeller on customer's hovercraft powered by BMW 113 HP engine with a belt reduction drive
New!
Ultra Prop Propellers and Accessories are found Here New!Bolly Airboat, Hovercraft and Aircraft Propellers
Bolly Propeller Blades Fit All Warp Drive Hubs--Make Excellent Warp Drive Replacement Blades--Smoother, Quieter Operation, More Efficient, More Thrust per HP & Safer for Rotax Gearboxes ! Light-Weight, Durable, Solid Carbon Fiber Composite Propellers
Bolly Magnum 3-blade Propeller Shown Here
Go To Our Bolly Hovercraft, Airboat and Aircraft Propellers!
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Sale Priced! Go to Heavy Duty Inflatable Boats, Dinghies, Pontoons and River Rafts Sale!
26 feet long x 30 inch diameter pontoon set shown above
Each Pontoon has several "D" rings equally spaced along its length on both sides for lashing to your platform
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Get your FREE Flying Boat Plans HERE
Leon's FREE 30 Foot+ Catamaran Sailboat/Power Boat Plans--Very Easy to Build for about $16K USD !
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How to Pay for Your Order
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Or Pay by Bank Wire Transfer and MoneyGram
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Or Pay by Check in USA only
OR, If paying with Foreign Currency Internationally
Use TransferWise To Pay for Your Order and
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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 ourselves 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 vendor! WE will not charge you a 3% fee if you use a credit/debit card to pay us using TransferWise, nor will TransferWise, nor will your Credit/Debit card issuer!
Our Telephone Numbers:
1-251-609-0969 in United States
+1-251-609-0969 outside United States
Email: hoverhawk (at) gnt.net
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SELLER'S NOTICE AND DISCLAIMER
Product 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. All sales are final. Warranty claims are solely limited to the manufacturer's warranty for any product defects in materials and/or workmanship. All returns must be pre-approved in advance or will otherwise be rejected and returned to sender at buyer's/sender’s expense. Seller's liability is limited only to the amount paid to Seller for the product purchased. Any legal dispute shall be conducted in the State of Alabama, in Baldwin County. All items to be returned, for any reason, must be authorized by us in advance and a RMA number must be issued, which must be attached in plain sight near rhe shipping label. Otherwise the sender is responsible for the return shipping costs or the cost of disposition of the returned goods.
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