Aircraft Spruce Australia
Melbourne, VIC Australia
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Engine Balance Master 377-447-503
MFR Model# HT503
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Overview
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Balance Masters® are Patented, Designed, Manufactured and Distributed in the U.S.A. and are easy-to-install devices for propellers and Rotax engines. These devices cut the vibration factor on ultralight aircrafts by as much as 50 percent when both balancers are installed. Balance Masters® are weighted with a high density liquid mass (Quick Silver). The physical principles of centrifugal and gyroscopic forces explain the action of the Balance Masters®. With the Balance Masters installed, the weighted liquid mass (Quick Silver) in the apparatus shifts during spinning, and adjusts to compensate for imbalances due to such factors as changes in flying conditions or warpage in the propeller, from nicks and rocks during takeoffs and landings. The Propeller Balance Masters® mounts on the propeller shaft or gear box in conjunction with the propeller. It is less than 7 inches in diameter. The Engine Balance Master is made to fit most Rotax engines and bolts under the Starter Pulley on the Fly Wheel side of the engine. It is less than 5 inches in diameter. Each device weighs about 4 oz. Installation will take about 25-30 minutes using ordinary hand tools for each device. Balance Master is designed to fit most propeller bolt patterns and Rotax engines from 277FA through 582. We will need to know the manufacturer of your propeller and engine model to determine the right configuration. On engines with reduction gear box can be used a second balancer on the crankshaft, installed as shown in the diagram. The installation of the two balancers, the propeller and crankshaft, gives the highest level of vibration reduction. 15-05828: Off-Set Prop Balancer 15-09450: Balancer for engine Rotax 912, 914 15-05261: Balancer for engine Rotax 377, 447, 503 15-05260: Balancer for engine Rotax 582, 618 |
Reviews
I use this balance on my Corvair powered KR2. The Corvair is already a smooth engine so this was added as insurance more than anything. Easy installation and seems to work good after 28 hrs. Really needs to be tested with a dyna-vibe. The manufacturer is pursuing an STC so maybe we will see some data from that effort.
I’m sure it works fine however it is not quite universal. There should be an alternative way to center the balance master on different prop spacer configurations. On mine, there is no centering nun so I can not place the round center hole of the balancer over the hub centering nub. I have yet to come up with a solution. Before purchasing - ask Aircraft spruce to post a picture of the prop hub that the balance master mounts to so you can compare.
It doesnt work on Autogyro configuration with Duc Helice props. Balancers inside diameter is 1/4 too small. Otherwise it would be great product to have.
Q&A
Please note, Aircraft Spruce Australia's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce Australia assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.
Yes, but you will want 15-05260.
Per manufacturer: 0.038"
YES Prop is an offset and Engine is an HT503 is for air cooled. It is worth having both per the vendor.
This would mount between the rear of the spinner back plate and the gearbox prop flange.
No, for the Rotax 912/914 you would want 15-10746.
