A. 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. The relative merits and technology of curved vs. straight fan blades have been debated for some time. If you ever look closely at a fan, the first thing you will notice is that the blades are set at an angle. 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. The straight blades move more air but they are louder. 61-67 Taras Avenue, P O Box 363Altona NorthVictoria  3025Australia, Phone: A word of caution - curved blade fans are inherently noisier than straight blade. Be aware of curved blade electric radiator cooling fans. 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. 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. Solidity ratio is the ratio of area of the blades to the area of the disc swept by them. The loss in performance is caused by the fact that curved blades stall at a lower static pressure than straight blades. radiator fan blade: straight or curved. If a fan moves less air, then simply, you can expect less noise. These are high-quality Spal fans. Tue Jul 01, 2008 9:09 pm. 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. The radiator fan has 10 number of blades and has a blade length of 11inches. The first one is a straight-blade fan, which lets the whole package be slimmer. Some manufacturers have chosen to curve the blades and keep the struts straight. Straight vs. Curved Fan Blades - Dispelling the Myth! 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. While both straight and curved blades are used, each type offers advantages and disadvantages. 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. If a fan moves less air, then simply, you can expect less noise. Fan Shroud. To get maximum airflow through your radiator core, you should use a fan shroud. All in an effort to seek more fan efficiency. As shown in the performance curves below, Davies Craig Thermatic Fan outperforms a competitor’s curved blade product across the full pressure range: 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. 110 deg. 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. If ultimate performance is the objective, use the straight blade 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. The questions are generally which is more efficient and which is more noisy. The resulting vortices were much smaller and removed much less energy therefore making the blade more efficient. Included with each fan is a fan mounting kit with 4 plastic through radiator core rods and clips, 4 … 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. In my 70 Chevelle I have a dual electric fan setup out of a 97 Contour. 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. 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. +61 3 9369 1234, Follow us on your favourite social media sites, FAN & EWP CONTROLLERS / SWITCHES-Testimonials. The curved blade fans sacrifice a small amount of performance in return for a much quieter fan. 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. This reduced depth helps the fan fit in tighter spaces. It was found that by inserting triangular protrusions near the leading edge of the blade, the air is tripped into going into vortices earlier. 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straight vs curved blade radiator fan

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