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05-12-2022, 08:35 AM
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Join Date: May 2005
Location: Boston, MA
Posts: 672
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Quote:
Originally Posted by sailvi767
We added the B&C 40 amp to our Rocket and deleted the normal belt driven alternator. So far it has been perfect. Eliminating the heavy conventional alternator seemed like a no brainer. I know several others who have gone with a pad mount as their only alternator and had similar success. Had I known about this product I probably would have used it instead of the B&C. If I have a issue with the B&C this will probably be the replacement. With modern lighting and avionics many RV’s are carrying extra weight producing amps they simply don’t need.
If you want a nice weight reduction and better lighting this product along with modern lights is a great modification.
G
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I did the same thing - went to a pad mount for my day vfr RV8. No regrets at all.
Bill, this looks really nice! At what RPM will this start generating power? The B&C pad mount pics up around 900-1000 rpm. How does yours compare?
__________________
Brian J.
Boston, MA
RV8 Based at ORH - Purchased
New Superior IO-360-B1AC2 w/Hartzell Composite CS
RV8 - #83313 - Under Construction (sort of!)
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05-12-2022, 08:54 AM
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Join Date: Aug 2021
Location: San Diego
Posts: 34
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Quote:
Originally Posted by Northernliving
I did the same thing - went to a pad mount for my day vfr RV8. No regrets at all.
Bill, this looks really nice! At what RPM will this start generating power? The B&C pad mount pics up around 900-1000 rpm. How does yours compare?
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You'll get 15 amps at around 1000 RPM, over 1800 you get 30 amps.
Bill
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05-17-2022, 08:57 PM
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Join Date: Aug 2010
Location: Newport News, Va
Posts: 444
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Hi Bill,
Question, does the generator run at the RPM of the coupling or is there a gearbox inside to increase RPM. A question from the Aeroelectric List.
.
__________________
John Bright, RV-6A, N1921R, at FWF
O-360, 8.5:1, vert sump, dual SDS EFI EM-5-F
Z101 as a template, links
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05-17-2022, 10:41 PM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,966
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Generator is direct drive to the spline coupling.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
1940 Taylorcraft BL-65
1984 L39C - SOLD
RV-8 - SDS CPI - SOLD
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05-17-2022, 11:18 PM
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Join Date: Aug 2021
Location: San Diego
Posts: 34
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Direct Drive
Yep, it's direct drive, the only thing between the generator shaft and the vacuum spline gear is a shear coupling.
Bill
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05-18-2022, 10:20 AM
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Join Date: Oct 2008
Location: Hales Corners, WI
Posts: 1,036
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Hey Bill,
Is there any plan to make a belt drive version of this? I currently run a B&C dynamo on my vacuum pad and it's been trouble free for 900 hours.
The 60 amp alternator hanging on the front from the folks that buy the cheap version of the ND alternator and make it "aviation grade" I'd LOVE to replace with a better mouse trap! (and I actually do not need 60 amps...) The thing has an intermittent habit of tripping the field circuit that is annoying. It'll go for months just fine, then it'll trip a dozen times within a couple flight hours.
As I'm heading for an instrument rating I'll need to do something with that problem being an all electric airplane and all.
__________________
Jesse Bentley (Queasy)
N229Z - RV-8 - Flying - Livin' the dream!
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05-18-2022, 02:56 PM
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Join Date: Aug 2021
Location: San Diego
Posts: 34
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Belt Drive
Quote:
Originally Posted by Veetail88
Hey Bill,
Is there any plan to make a belt drive version of this?
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Hi Jesse,
Yes, I am working on a belt driven version. There are some mechanical hurdles so don't expect anything for quite some time but it is my intention to make one that runs on the front of the engine.
Thanks,
Bill
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05-18-2022, 03:19 PM
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Join Date: Oct 2008
Location: Hales Corners, WI
Posts: 1,036
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Quote:
Originally Posted by monkworkz
Hi Jesse,
Yes, I am working on a belt driven version. There are some mechanical hurdles so don't expect anything for quite some time but it is my intention to make one that runs on the front of the engine.
Thanks,
Bill
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Great! I'll watch for it! And when you get the lightweight aluminum brackets made, get them anodized red! Gotta look cool!
__________________
Jesse Bentley (Queasy)
N229Z - RV-8 - Flying - Livin' the dream!
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05-19-2022, 04:40 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 6,720
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Install was easy, getting the larger B&C off required removing the mag for access. So far I like what I see and think it will be a winner. I was surprised how quickly it picked up the load compared to the B&C I removed. Much more compact and weight loss of about 3-4 lbs..
Voltage setting for stby use is perfect at 14.2
Added pic below for a little more reg install detail.
Used a 2 conductor shielded wire for the enable switch as suggested in the IM.

__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 2000+ hrs, New Titan IO-370, Bendix Mags, MTV-9 prop
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
Last edited by Walt : 05-19-2022 at 08:02 PM.
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05-19-2022, 04:45 PM
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Join Date: Dec 2005
Location: Sierra Nevada
Posts: 1,058
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Walt, is that just a double Adel Clamp on the engine mount for the electronics? I do like that if so.
__________________
Mike C.
Sierra Nevada
RV-6A bought flying (for sale soon)
Super-8 bought flying
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