Below is an overview of the Hyde Mount range courtesy of Merle himself, thank you to Keith Jackson for obtaining the information and Merle for such a detailed reply.
Thanks so much for the interest you have expressed concerning my mounts. I am not on the internet so really do not know what all of the concerns modellers having regarding the performance and selection of my mounts. Anything you may post on web sites will be greatly appreciated. I will attempt to explain mount types available and the performance features. I have probably written a million+ words about my mounts - but those words have never been widely published. Some probably think the mounts have little value and that I charge too much money for them. One mount can take me a day to build - I have contacted rubber fabricators and they will offer proto types with no guarantee of rubber process/bonding reliability - as they do not understand my concept. Plus, they will attempt to build something for $200,000 - $300,000 - with my market it is not reasonable for me to invest such money into an unknown result. I have constantly improved my mounts and am always developing something that is just another step up the ladder. Each mount I have built the isolator has always performed amazingly - one mount I built 10 years ago was flown over 7000 flights - upon disassembly the rubber condition and bonding was nearly as new. I just need 500 more years and then maybe I would be content!!!
Isolation mounting of model engines has consumed me for around 25 years. I went against the "Experts" when I ventured into this endeavour. I simply was at my wits end concerning aircraft losses once Chip and I really got into serious flying. Major airborne equipment life for us was around 25 to 75 fights. I knew vibration was the problem, so I started isolation mounting experiments that generally proved to be better than hard mounting. Then I began experimenting with the "single isolator" vs. the scattered arrangement of isolators. Scattered arrangement isolators, such as "lord" mounts, bolt thru grommets, rubber tabs, and etc. chunks of rubber did little or nothing when used with a model engine. If they were very soft to get better vibration reduction they simply had a very short life, when the firmer ones were used they simply did not reduce vibration, and in many instances they even amplified vibration. So, when we got 500 flights with my "single isolator" design, with the same servos, pots, gears, linkage, including still having the same aircraft I realized I was doing something right! Once that same airplane was flown around 2500 flights with the same mount and major airborne equipment I knew I was doing it right and decided to offer my mounts to others. I had around 10 years of experience building the "single isolator" before I offered it to others. A mount being too soft was never a concern for me or a reason to abandon one of my very soft mounts that I had made. I simply worked around the minor distractions of exhaust attachment, cowl clearance, throttle control, carburettors, and etc. minor value items - the little extra cowl clearance looked real good after 2500 flights with the same servos and etc.. I simply wanted to extend, and did extend approx. 50 times, the life of the MAJOR and high value components.
Pattern/Sport/IMAC Mounts for 1.2 - 2.0 CID (20-33cc) engines:
"CDR" = percentage of "Current Drain Reduction" - same as percentage of vibration reduction. Mounts available range from 35% to 80% CDR. Higher numbers provide better high RPM vibration protection and are softer mounts - idle movement may be a distraction with softer mounts for some.
Hyde Mount Types:
"A" - CDR 60% - w/nylon beams - use without a nose ring - good idle
"A"(A4) - CDR 60% - w/alum beams - use with nose ring - good idle.
"AR" - CDR 70% - w/nylon beams - use with nose ring - good idle
"ARS" - CDR 80% - w/nylon beams - with shear axis limiter to control side/lateral mount movement (a desirable feature for softer mounts) - use with nose ring - fair idle
"AR"(A4) - CDR 70% - w/alum beams - use with nose ring - good idle
"ARI" - CDR 70% - w/nylon beams - with nose ring incorporated - good idle
"ARI"(A4) - CDR 70% - w/alum beams - with nose ring incorporated - good idle
"ARIS" - CDR 80% - w/nylon beams - with nose ring incorporated - with shear axis limiter - fair idle
"ARIS"(A4) - CDR 80% - w/alum - with nose ring incorporated - with shear axis limiter - fair idle
Following mounts fits approx. 17 different engines from 1.2 - 2.0 CID - performance rating for a mid range size engine, i.e. when used with a YS160/170. Performance may vary slightly when used with various airframes and engines.
"AR 50" thru "AR 80" - CDR 50 to 80% - w/alum beams - use with nose ring - good to fair idle range - when using highest CDR 80 it is recommended that ignition delay be used to reduce engine rotational movement during start up, pre-ignition, or kick-back.
For any of my mounts I recommend the exhaust attachment principle utilized be functionally similar to that of a nose ring. A nose ring is for front end support assistance of my softer mounts. The nose ring controls the engine laterally, i.e. up/down/left/right - but permits the front housing to move fore and aft within it - the mounts stretch slightly at full power, so the fore and aft movement is easily accommodated within the nose ring. A remote exhaust system, i.e. a tuned pipe/muffler, should be affixed to the airframe with light contacting cushioned surrounding clamps - these clamps control the lateral movement but permits the exhaust to easily slide fore and aft, to follow the engine when the power settings are varied. A light fitting surrounding cushioned exhaust attachment system lowers noise, reduces airframe vibration, and extends the life of headers or eliminates header breakage.
I make around 600 mount types/styles/sizes of "tractor" and "pusher" mounts for engines .049 thru 26.0 CID, including electrics.
Maybe the foregoing will give you some idea of the mounts I make.
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