110 deg. I changed a curved blade SPAL for a straight blade SPAL and the difference in noise level was significant. Some manufacturers have chosen to curve the blades and keep the struts straight. im thinking of replacing my 10" puller fan to a 12" as there seems to be a good amount of room for a bigger fan. As a result of the extensive research program, Davies Craig were able to ascertain that curved blades generated less noise, however, this was achieved at the expense of a significant loss in performance. CFM — cubic feet per minute — is the rating given to every fan, signifying how much air a fan … To get maximum airflow through your radiator core, you should use a fan shroud. This is a popular choice for many owners because it offers slightly better total airflow performance than the straight blade, but it is noticeably quieter. All in an effort to seek more fan efficiency. While both straight and curved blades are used, each type offers advantages and disadvantages. The questions are generally which is more efficient and which is more noisy. 61-67 Taras Avenue, P O Box 363Altona NorthVictoria  3025Australia, Phone: In addition to that, it has a fan diameter of 11.73 inches and depth 2.56 inches. The curved blades don’t move as much air but offer quieter driving. Blade Technology: Straight vs. Curved Blades Explained. Our investigations also found that when air flowed in layers (laminar flow), it breaks up into counter rotating airflow vortices (whirlwinds): These vortices consume energy and therefore reduce the airflow. It moves 590 CFM at 0 static pressure, drawing only 5.3 amps. With both straight or skewed reversible blades for all your cooling needs, our fans are perfect for all your automotive cooling needs. As a result of the extensive research program, Davies Craig were able to ascertain that curved blades generated less noise, however, this was achieved at the expense of a significant loss in performance. Spal VA08-AP71/LL-53S 14" Blower fan, vs an eBay fan advertised as 220W... but after testing only drew 85W. If a fan moves less air, then simply, you can expect less noise. And we proudly make our products in the U.S. Solidity ratio is the ratio of area of the blades to the area of the disc swept by them. It fits very nice and pulls a ton of air through the radiator. The next fan uses an. the difference between the cooling tendencies of straight blade and skewed blade electric radiator cooling fans When all aspects of blade design are considered, straight blades with trips, winglets and the correct shroud is the optimum, test-proven combination for efficient fan operation. SINGLE FAN MOUNTING HARDWARE KIT (12V) (1000) SINGLE FAN MOUNTING HARDWARE KIT (24V) (1001) DUAL FAN MOUNTING KIT - UNIVERSAL 12V (1002) DUAL FAN MOUNTING KIT - UNIVERSAL 24V (1003) FAN & TRANS OIL COOLER MOUNTING HARDWARE (UNIVERSAL) (0578) The Davies, Craig Universal Fan Fitting Kit includes all parts necessary for mounting and wiring any 12- and 24-volt electric fans – all Davies, Craig Thermatic®Fans and other electric fan models. Since this approach significantly affects performance, Davies Craig has proven it's best to adopt the reverse approach of having straight blades and curving the struts. Cooling Fans - … They are quieter than a straight blade fan but are also less efficient. Wood: “Curved blade fans are quieter and tend to provide slightly more airflow than their straight blade counterparts and the reason is simple: air impulses on a straight blade fan are more direct due to the straight edge on each blade pulling air through. Fan blades have gone through a number of evolutionary steps. If installing one into a high-performance engine, the straight blade is the way to go. Please visit our buy online section to view our Thermatic Electric Fan range. As shown in the performance curves below, Davies Craig Thermatic Fan outperforms a competitor’s curved blade product across the full pressure range: All shot blasting machines require blades to propel media towards workpieces. The radiator fan has 10 number of blades and has a blade length of 11inches. Tue Jul 01, 2008 9:09 pm. While the purpose of a ring is to reduce losses from air passing from the high-pressure side of the blade to the low-pressure side as shown, Davies Craig managed to achieve this by adding winglets to the blade tips without energy loss. Initially I used a small (1" thick) radiator fan and constantly over heated. If ultimate performance is the objective, use the straight blade fans. The angle is designed to almost cut or curve its way through the air. S-blade which has a little quieter operation and it has a ring around the fan blade for support, providing better fan-blade stability. Straight vs. Curved Fan Blades - Dispelling the Myth. As a result of the extensive research program, Davies Craig were able to ascertain that curved blades generated less noise, however, this was achieved at the expense of a significant loss in performance. A fan shroud ensures that air is moving through the radiator core and not around it. But if it's drawing the fan blades into the surface of the radiator.... then it could eventually wear a hole or two into the very thin aluminum fins of the Rad. Some manufacturers have chosen to curve the blades and keep the struts straight. As shown in the performance curves below, Davies Craig Thermatic Fan outperforms a competitor’s curved blade product across the full pressure range: Noise Control: Most fan noise is generated from a blade passing a shroud strut. The curved blade fans sacrifice a small amount of performance in return for a much quieter fan. The curved blade or S-Blade model (VA18-AP71/LL-59A) displaces 2024 cfm, has a 19.5 amp total draw at 0 static pressure. 7-blade plastic fan correctly orientated, with the deep dish facing away from the engine, and the slightly curved leading edge of the blades for clock-wise rotation. Besides, it is excellent for an upgrade from factory parts and a replacement. Copyright © 2020 - Rocket Industries Pty Ltd. The idea of a ring around the blade tips was also researched and rejected since the performance suffered due to the increased energy required to propel the blade with extra weight at the tips. Fan the wrong way round, blades fouling engine parts. Will the electric fans help keep my car cooler at highway speeds? A. In my 70 Chevelle I have a dual electric fan setup out of a 97 Contour. Features curved blades which are much quieter than straight bladed fans; Available in 10, 12, 13, 14 or 16-inch sizes; Blades are made from durable plastic and have a natural finish; 12V motor uses a total of 14.2 amps; Fan assembly has a depth of 3.5" When all aspects of blade design are considered, straight blades with trips, winglets and the correct shroud is the optimum, test-proven combination for efficient fan operation. Flex-a-lite invented the Flex Fan and holds the patent for the first electric fan for the automotive aftermarket. If a fan has a lot of blades but the pitch of those blades is flat… you will get the riverboat paddle wheel affect where the fan will make a lot of noise but not move much air, like a riverboat paddle wheel. I'm writing this review for using this 12" high output SPAL fan on a kit car based on the ford focus 2.0L engine rear mounted with a front mount honda b16 triple core radiator. I went on to try and explain that just saying curved blade is not enough, as there are foward facing curved blades as well as backward or reverse facing curved blades. Very easy to fab some brackets and install. The resulting vortices were much smaller and removed much less energy therefore making the blade more efficient. It measures 3.39 inches in total depth. This reduced depth helps the fan fit in tighter spaces. Included with each fan is a fan mounting kit with 4 plastic through radiator core rods and clips, 4 … Since this approach significantly affects performance, Davies Craig has proven it's best to adopt the reverse approach of having straight blades and curving the struts. If a fan moves less air, then simply, you can expect less noise. radiator fan blade: straight or curved. If you ever look closely at a fan, the first thing you will notice is that the blades are set at an angle. Generally, cooling fans do the most work at idle and … The fan pulled about 7A, was straight blade and appeared to drive air well enough. The noise level is higher when the whole length of a blade overlaps/passes a shroud strut and if all the blades pass all the struts of a shroud at the same time, noise is at its worst. Not sure what size the radiator is in a Camaro but if its close in size to the Chevelle radiator this is a good electric fan … The loss in performance is caused by the fact that curved blades stall at a lower static pressure than straight blades. Be aware of curved blade electric radiator cooling fans. The resulting vortices were much smaller and removed much less energy therefore making the blade more efficient. This 10" electric fan uses curved blades to provide more blade area and performance with less noise, plus has a lower profile. If noise is an issue, go with the curved blade fans. The first one is a straight-blade fan, which lets the whole package be slimmer. The idea of a ring around the blade tips was also researched and rejected since the performance suffered due to the increased energy required to propel the blade with extra weight at the tips. The straight blade fans provide maximum cooling for their size. It was found that by inserting triangular protrusions near the leading edge of the blade, the air is tripped into going into vortices earlier. Early jet engines use what are called narrow chord fan blades that are typically made of solid titanium. Our fans come in many different sizes and styles, ranging from 6.5” to 16” in diameter. The noise level is higher when the whole length of a blade overlaps/passes a shroud strut and if all the blades pass all the struts of a shroud at the same time, noise is at its worst. While the purpose of a ring is to reduce losses from air passing from the high-pressure side of the blade to the low-pressure side as shown, Davies Craig managed to achieve this by adding winglets to the blade tips without energy loss. Fan types range from forward curved fans to backward curved fans, backward inclined fans, radial tip fans, and radial blade fans. The thread was in regard to comparing straight blades versus curved blade cooling fans. All three electric fans shown use a 16-inch fan blade. Davies Craig conducted a thorough research program to formulate the design of fans in which several design types including straight blades and curved blades with and without a ring were considered. The loss in performance is caused by the fact that curved blades stall at a lower static pressure than straight blades. Performance cooling products for the automotive market. The loss in performance is caused by the fact that curved blades stall at a lower static pressure than straight blades. The more blades that you have on a fan, the easier it is for those blades to move air. Which do you guys think is better, a curved blade or straight blade design or does it make a … These are high-quality Spal fans. SPAL 30101522 12" Fan Puller Curved Blades 12 Volt High-Performance 1226 cfm VA10-AP50/C-61A Universal 10 inch Black Slim Fan Push Pull Electric Radiator Cooling 12V 80W Mount Kit Spal 30100374 Pusher Fan (10In ; For Use W/ 15Amp Fuse at 13V), 1 Pack Fan Shroud. No content can be reproduced in any form without approval. The straight blades move more air but they are louder. The full product line now includes the patented Flex-a-fit aluminum radiators, electric fans, belt-driven fans, oil coolers, Mojave heaters and Flexite windows. +61 3 9369 1234, Follow us on your favourite social media sites, FAN & EWP CONTROLLERS / SWITCHES-Testimonials. This unit is spec'd at 2780 cfm, which has been more than adequate to cool my 9.2:1 468 in 105 ambient temperature in heavy traffic. Correctly fitted, blades well clear of thermostat housing, alternator etc. I was riding this summer in some pretty hot climate during a road trip. As shown in the performance curves below, Davies Craig Thermatic Fan outperforms a competitor’s curved blade product across the full pressure range: Noise Control: Most fan noise is generated from a blade passing a shroud strut.