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12-30-2015, 11:49 AM
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Join Date: May 2013
Location: Milano Italy
Posts: 78
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Quote:
Originally Posted by burgundyja
IO-360 200hp Catto fixed pitch prop.
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Hi Mike, could you tell about numbers from your Catto prop?
thanks
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Lucio
Milano Italy
Blue-7
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12-30-2015, 12:02 PM
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Join Date: Feb 2014
Location: Windsor, CO
Posts: 257
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Quote:
Originally Posted by burgundyja
I know that that 24 doesn't have the options of the 680. The starter I have says it should draw about 200 amps so it looks like the 24 would work. Is there a reason why you think its to small. I like the weight and the price.
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The initial inrush current from your starter will measure closer to 600 amps which is why you need the ETX680 at a minimum. For any vehicle, the charging system is one of the most used systems and under sizing any of the components, which would include the alternator, the starter or the battery, will have poor performance results, cause additional stresses to the system and cause premature failures.
I understand that the cost of the batteries can be restrictive and is not for everyone. Based on this, we recommend buying a lead acid battery that meets your needs than buy an under sized lithium battery.
Fly Lightly,
Kathy
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Fly Lightly,
Kathy
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12-30-2015, 01:56 PM
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Join Date: Sep 2006
Posts: 155
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very nice design and construction. I like the hold down better than the one I built. High quality, I cannot wait to see the rest of your plane. Keep pounding, one day it will fly and you enter a new chapter.
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Bernie Weiss
St Paul MN
RV7A (sold)
RV9 flying - N579DB
Dues paid
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12-30-2015, 02:31 PM
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Join Date: Nov 2007
Location: Pleasanton, CA
Posts: 188
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Quote:
Originally Posted by RV7Guy
I had many parts anodized as well.
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Like the purdy conical washers under the cap screws?
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Kurt Haller
P-town, CA (10 min from KLVK!)
N748PK, RV-9A
Flying as of 13 July 2019
VAF dues last paid 28 Dec 2019
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12-30-2015, 04:14 PM
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Join Date: Jan 2005
Location: Chandler, AZ
Posts: 2,904
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Bought'm
Quote:
Originally Posted by DrillBit
Like the purdy conical washers under the cap screws?
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Nope, bought those.
__________________
Darwin N. Barrie
Chandler AZ
www.JDair.com
RV-7 N717EE-Flying (Sold)
RV-7 N717AZ Flying, in paint
EMS Bell 407,
Eurocopter 350 A-Star Driver
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01-05-2016, 10:36 AM
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Join Date: Feb 2014
Location: Windsor, CO
Posts: 257
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First new product to be introduced in 2016!
Based on many of you requesting a battery box that could be interchangeable between the ETX680/ETX900 or the PC680.......we have listened and we have it! The mounting holes are exactly the same as the one Van's sells for the PC680 so no modifications needed there, it weight just over 8 ounces and cost $59. If you want to read more about it check it out here at:
http://earthxmotorsports.com/shop/mu...-pc680-odyssey
Fly Lightly!
Kathy
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Fly Lightly,
Kathy
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01-05-2016, 11:16 AM
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Join Date: Jun 2014
Location: Ottawa, ON, Canada
Posts: 353
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Brilliant! *now* I can start building 
__________________
J.F.
Sling 4 empennage kit on order!
Future EAA 245 Member (Hopefully)
Current Piper Warrior PA-28-151 Owner/Pilot
Ottawa, Ontario, Canada
http://www.sling4.ninja
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01-05-2016, 02:32 PM
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Join Date: May 2011
Location: Roseville
Posts: 386
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My plane goes in for annual the end of this month. The PC680 is just about 4 years old and beginning to show signs of aging sooooooo..... I ordered the EarthX 680 and the new battery box. They say it matches up with the existing holes so I'll let you know how the exchange goes. Really nice folks at EarthX, I must say.
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RV-9A N435KR, Vans calendar March 2018
LIO 320 B1A, Dual LS Plasma III, AFP injection
G3x touch
Roseville, Ca
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01-09-2016, 05:57 PM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,626
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Battery comparison
I was able to get some testing done today, and thought I would share with everyone here. I currently have an Odyssey PC925 in the RV10, and have always used that battery in both RV10's, changing it out every 3 years. The battery always tested good, but I really don't care to be stranded somewhere. It's 3 years since I installed the last one and time for a change, and I thought I would look into EarthX batteries again, seeing as they have some more choices now and a pretty good track record from what I can tell.
Kathy at EarthX was kind enough to send me both a ETX 900 and an ETX 1200 so I could compare them. I certainly don't have a lab for testing batteries, but here's what I decided to do:
Crank for 10 seconds and see what the rpm's were using an optical tach. Then run the full avionics load for 45 mins. Then crank for 10 seconds again and count RPM's and measure cranking voltage.
Here's what I got:
PC 925 - initial voltage with everything on: 12.4 v
- cranking rpms: 120
- 30 minutes load: 11.8 v
- 45 mins load 11.7
- crank after 45 mins 80 rpm and 10.0 v
ETX 900 - initial voltage with everything on 13.2
- cranking rpm's 140
- 30 mins load 12.7
- 45 mins load 12.6
- crank after 45 mins load 120-140 rpms 10.6 v
ETX 1200 - initial voltage with everthing on 13.1v
- crank 10 seconds 160 rpm
- 30 mins load 12.8v
- 45 mins load 12.7
- crank after 45 mins 140 rpm 11.9v
Conclusions: either the 900 or the 1200 are adequate for the RV10 in my estimation. I was really impressed with the power out of a box that is so light!
As luck would have it my friend and fellow RV10 driver Ted Chipps needs a battery for his 10 and he chose the 900, so I will put the 1200 in mine and I will report back on this list of any findings. Hopefully we will be able to get some good long-term data from these 2 aircraft that are similarly equipped.
Kudos to Kathy and the team at Earthx!
Vic
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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01-09-2016, 09:10 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Quote:
Originally Posted by vic syracuse
I was able to get some testing done today, and thought I would share with everyone here. I currently have an Odyssey PC925 in the RV10, and have always used that battery in both RV10's, changing it out every 3 years. The battery always tested good, but I really don't care to be stranded somewhere. It's 3 years since I installed the last one and time for a change, and I thought I would look into EarthX batteries again, seeing as they have some more choices now and a pretty good track record from what I can tell.
Kathy at EarthX was kind enough to send me both a ETX 900 and an ETX 1200 so I could compare them. I certainly don't have a lab for testing batteries, but here's what I decided to do:
Crank for 10 seconds and see what the rpm's were using an optical tach. Then run the full avionics load for 45 mins. Then crank for 10 seconds again and count RPM's and measure cranking voltage.
Here's what I got:
PC 925 - initial voltage with everything on: 12.4 v
- cranking rpms: 120
- 30 minutes load: 11.8 v
- 45 mins load 11.7
- crank after 45 mins 80 rpm and 10.0 v
ETX 900 - initial voltage with everything on 13.2
- cranking rpm's 140
- 30 mins load 12.7
- 45 mins load 12.6
- crank after 45 mins load 120-140 rpms 10.6 v
ETX 1200 - initial voltage with everthing on 13.1v
- crank 10 seconds 160 rpm
- 30 mins load 12.8v
- 45 mins load 12.7
- crank after 45 mins 140 rpm 11.9v
Conclusions: either the 900 or the 1200 are adequate for the RV10 in my estimation. I was really impressed with the power out of a box that is so light!
As luck would have it my friend and fellow RV10 driver Ted Chipps needs a battery for his 10 and he chose the 900, so I will put the 1200 in mine and I will report back on this list of any findings. Hopefully we will be able to get some good long-term data from these 2 aircraft that are similarly equipped.
Kudos to Kathy and the team at Earthx!
Vic
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While I like to see controlled lab tests, this is well done for real world conditions! Nicely done Vic. The extra energy density really shows in the second spin test.
Are you going to vent it in case of a failure to keep the potential of gas out of the cabin?
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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