All in an effort to seek more fan efficiency. The angle is designed to almost cut or curve its way through the air. Written by Davies Craig Category: Cooling, Air Conditioning & Insulation. 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. They are quieter than a straight blade fan but are also less efficient. S-blade which has a little quieter operation and it has a ring around the fan blade for support, providing better fan-blade stability. All three electric fans shown use a 16-inch fan blade. 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. As shown in the performance curves below, Davies Craig Thermatic Fan outperforms a competitor’s curved blade product across the full pressure range: Straight vs. Curved Fan Blades - Dispelling the Myth! The resulting vortices were much smaller and removed much less energy therefore making the blade more efficient. 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. 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. I was riding this summer in some pretty hot climate during a road trip. Our fans come in many different sizes and styles, ranging from 6.5” to 16” in diameter. Which do you guys think is better, a curved blade or straight blade design or does it make a … No content can be reproduced in any form without approval. 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. 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 more blades that you have on a fan, the easier it is for those blades to move air. If installing one into a high-performance engine, the straight blade is the way to go. If noise is an issue, go with the curved blade fans. 61-67 Taras Avenue, P O Box 363Altona NorthVictoria  3025Australia, Phone: It fits very nice and pulls a ton of air through the radiator. 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. 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 straight blade fans provide maximum cooling for their size. If a fan moves less air, then simply, you can expect less noise. If ultimate performance is the objective, use the straight blade fans. Fan the wrong way round, blades fouling engine parts. Some manufacturers have chosen to curve the blades and keep the struts straight. Early jet engines use what are called narrow chord fan blades that are typically made of solid titanium. Each blade on curved blade fan pulls air at slightly differing times and the air impulses overlap, cancelling the airwaves each creates while … The curved blade fans sacrifice a small amount of performance in return for a much quieter fan. In addition to that, it has a fan diameter of 11.73 inches and depth 2.56 inches. 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. A word of caution - curved blade fans are inherently noisier than straight blade. Will the electric fans help keep my car cooler at highway speeds? Generally, cooling fans do the most work at idle and … 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 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. 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. 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. If a fan moves less air, then simply, you can expect less noise. Copyright © 2020 - Rocket Industries Pty Ltd. The straight blades move more air but they are louder. 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. If a fan moves less air, then simply, you can expect less noise. Fan blades have gone through a number of evolutionary steps. 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. And we proudly make our products in the U.S. Initially I used a small (1" thick) radiator fan and constantly over heated. Tue Jul 01, 2008 9:09 pm. Flex-a-lite invented the Flex Fan and holds the patent for the first electric fan for the automotive aftermarket. To get maximum airflow through your radiator core, you should use a fan shroud. Very easy to fab some brackets and install. 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 … A fan shroud ensures that air is moving through the radiator core and not around it. 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. Solidity ratio is the ratio of area of the blades to the area of the disc swept by them. The curved blades don’t move as much air but offer quieter driving. The loss in performance is caused by the fact that curved blades stall at a lower static pressure than straight blades. The next fan uses an. 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. The fan pulled about 7A, was straight blade and appeared to drive air well enough. All shot blasting machines require blades to propel media towards workpieces. 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. 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. The radiator fan has 10 number of blades and has a blade length of 11inches. 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. the difference between the cooling tendencies of straight blade and skewed blade electric radiator cooling fans The loss in performance is caused by the fact that curved blades stall at a lower static pressure than straight blades. Fan types range from forward curved fans to backward curved fans, backward inclined fans, radial tip fans, and radial blade fans. It was found that by inserting triangular protrusions near the leading edge of the blade, the air is tripped into going into vortices earlier. If you desire a more quiet fan then the curved is the way to go but if you need all airflow possible, go for the straight blades. 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" If you ever look closely at a fan, the first thing you will notice is that the blades are set at an angle. Cooling Fans - … The first one is a straight-blade fan, which lets the whole package be slimmer. 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. This reduced depth helps the fan fit in tighter spaces. The thread was in regard to comparing straight blades versus curved blade cooling fans. Please visit our buy online section to view our Thermatic Electric Fan range. In my 70 Chevelle I have a dual electric fan setup out of a 97 Contour. Some manufacturers have chosen to curve the blades and keep the struts straight. radiator fan blade: straight or curved. Straight vs. Curved Fan Blades - Dispelling the Myth. Spal VA08-AP71/LL-53S 14" Blower fan, vs an eBay fan advertised as 220W... but after testing only drew 85W. I changed a curved blade SPAL for a straight blade SPAL and the difference in noise level was significant. Blade Technology: Straight vs. Curved Blades Explained. The questions are generally which is more efficient and which is more noisy. Fan blades are curved for optimum air circulation which is determined by solidity ratio. Included with each fan is a fan mounting kit with 4 plastic through radiator core rods and clips, 4 … The resulting vortices were much smaller and removed much less energy therefore making the blade more efficient. Be aware of curved blade electric radiator cooling fans. 02-10-09 07:02 AM - Post# 1626775 In response to Jim.Biron I am running a Be-Cool p/n 75007 dual 11" paddle fan setup. 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. It was found that by inserting triangular protrusions near the leading edge of the blade, the air is tripped into going into vortices earlier. These are high-quality Spal fans. While both straight and curved blades are used, each type offers advantages and disadvantages. 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 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. Fan Shroud. 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. 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. Our products include dual electric fans, fan relays, fan shrouds, thermal fan switches, and overflow bottles. As an expert in the shot blasting industry, Rosler Metal Finishing knows about blade technology. Correctly fitted, blades well clear of thermostat housing, alternator etc. The loss in performance is caused by the fact that curved blades stall at a lower static pressure than straight blades. 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. 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. 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. Besides, it is excellent for an upgrade from factory parts and a replacement. Q. With both straight or skewed reversible blades for all your cooling needs, our fans are perfect for all your automotive cooling needs. It moves 590 CFM at 0 static pressure, drawing only 5.3 amps. A. 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. The relative merits and technology of curved vs. straight fan blades have been debated for some time. It measures 3.39 inches in total depth. CFM — cubic feet per minute — is the rating given to every fan, signifying how much air a fan … 110 deg. Performance cooling products for the automotive market. +61 3 9369 1234, Follow us on your favourite social media sites, FAN & EWP CONTROLLERS / SWITCHES-Testimonials. This electric cooling fan can draw 6.6 amp of current and produces 1550 CFM. This 10" electric fan uses curved blades to provide more blade area and performance with less noise, plus has a lower profile. Overflow bottles the U.S. all in an effort to seek more fan efficiency 220W... but testing. The angle is designed to almost cut or curve its way through the radiator include dual electric fan.... Go with the curved blade electric radiator cooling fans - … performance products. Thermal fan switches, straight vs curved blade radiator fan overflow bottles providing better fan-blade stability thick radiator... A 16-inch fan blade seek more fan efficiency more blade area and performance with less.. Advertised as 220W... but after testing only drew 85W fan setup out of a 97 Contour riding this in... 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