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Search: Posts Made By: Hartstoc
Forum: RV General Discussion/News Yesterday, 11:38 AM
Replies: 24
Views: 1,139
Posted By Hartstoc
I think you may have hit on an idea that could...

I think you may have hit on an idea that could truely optimize power consumption! There IS a concern that throughput be adequate for pump cooling, but of course heat is proportional to current,...
Forum: RV General Discussion/News Yesterday, 11:06 AM
Replies: 24
Views: 1,139
Posted By Hartstoc
The promised internals-

(2-17-19 edit) I promised to add photos and commentary on the internals of these pumps. Sorry for the delay- I’m putting this here for a “bump” , and also will try to edit it into the primary post of...
Forum: RV General Discussion/News Yesterday, 10:56 AM
Replies: 24
Views: 1,139
Posted By Hartstoc
Thank you ,Dan, your blessing here really means a...

Thank you ,Dan, your blessing here really means a lot.- Otis
Forum: Glass Cockpit Yesterday, 09:49 AM
Replies: 40
Views: 1,919
Posted By Hartstoc
Yes, ditto to Larryís comment, it is refreshing...

Yes, ditto to Larryís comment, it is refreshing to have a company insider make the effort to take some of the mystery out of a very complex system. -Otis
Forum: VAF Classifieds (posts in here deleted after 30 days) 02-16-2019, 10:11 PM
Replies: 2
Views: 673
Posted By Hartstoc
These items remain available

Still no takers on this package- I think it represents a pretty good deal for someone- Otis
Forum: VAF Classifieds (posts in here deleted after 30 days) 02-16-2019, 09:56 PM
Replies: 6
Views: 1,677
Posted By Hartstoc
REALLY! Even if 1,528 EW includes paint, might as...

REALLY! Even if 1,528 EW includes paint, might as well just take out that seat on the right side!
Forum: RV General Discussion/News 02-16-2019, 04:38 PM
Replies: 24
Views: 1,139
Posted By Hartstoc
Ross- You bring up a good point, it is important...

Ross- You bring up a good point, it is important to verify that fuel delivery meets real-world need, with a comfortable margin, AT the injector. These Walbro pumps are customized internally for...
Forum: VAF Classifieds (posts in here deleted after 30 days) 02-16-2019, 03:07 PM
Replies: 14
Views: 849
Posted By Hartstoc
Wink If youíd consider a partial claim on your soul, I...

If youíd consider a partial claim on your soul, I might be able to put you in touch with someone! ;-)

Seriously, though, Spring is just around the corner! Hang in there-
Forum: Glass Cockpit 02-16-2019, 02:42 PM
Replies: 40
Views: 1,919
Posted By Hartstoc
Levi- I missed this response prior to posting...

Levi- I missed this response prior to posting just below. Glad to hear confirmation that the center of rotation is the ideal, but surprised by the generous off-center allowances. And my bad, GSU25...
Forum: Glass Cockpit 02-16-2019, 02:09 PM
Replies: 40
Views: 1,919
Posted By Hartstoc
Larry, During maneuvers, the aircraft rotates...

Larry, During maneuvers, the aircraft rotates about its 3-D CG. Imagine the extreme of installing the GMU25 in a wingtip. During an abrupt roll, it would register the roll, a non-existent sharp...
Forum: Glass Cockpit 02-16-2019, 01:18 PM
Replies: 40
Views: 1,919
Posted By Hartstoc
If the GMU25 is far off the center of the roll...

If the GMU25 is far off the center of the roll axis, it is describing an arc instead of pure rotation in roll, inducing a complicated and erroneous input of vertical and lateral accellerations when...
Forum: Safety 02-16-2019, 10:53 AM
Replies: 22
Views: 1,447
Posted By Hartstoc
Crosswind operating limits relate to control...

Crosswind operating limits relate to control authority limitations, for example a rudder that cannot align the aircraft with the runway beyond a particular crosswind component. With RVís control...
Forum: Glass Cockpit 02-16-2019, 10:23 AM
Replies: 40
Views: 1,919
Posted By Hartstoc
Why not just power thegsu25 from a discrete...

Why not just power thegsu25 from a discrete pullable breaker- should not happen often enough to warrant a switch.
Forum: Glass Cockpit 02-16-2019, 10:08 AM
Replies: 40
Views: 1,919
Posted By Hartstoc
Cool Hmmn- this seems to be correcting another...

Hmmn- this seems to be correcting another misconception that I did not know I had! I thought I’d read that the G5 would default to ADAHRS data from the GSU25 when provided on the can bus! Not true? I...
Forum: RV General Discussion/News 02-15-2019, 07:19 PM
Replies: 24
Views: 1,139
Posted By Hartstoc
Understood- I assume that most running EFI rely...

Understood- I assume that most running EFI rely on electric pumps(and how long has it been since ANY cars were built with mechanical pumps?!) My objective here is to encourage matching the pump to...
Forum: RV General Discussion/News 02-15-2019, 02:57 PM
Replies: 24
Views: 1,139
Posted By Hartstoc
A couple of notes-

1-Beware of counterfiet Walbro pumps- they are copied right down to the labels in China. Cyberspace Automotive Performance, one dealer offering them online has actually published an offer from a...
Forum: RV General Discussion/News 02-15-2019, 02:37 PM
Replies: 24
Views: 1,139
Posted By Hartstoc
I beieve they are made in house by Airflow...

I beieve they are made in house by Airflow Performance, ditto for the return valves and the nifty banjo-fitting manifold to which the relief valve in the photos is attached. Talk to Don Rivera there,...
Forum: RV General Discussion/News 02-15-2019, 10:47 AM
Replies: 24
Views: 1,139
Posted By Hartstoc
Thanks for the compliment! True the 414 is a bit...

Thanks for the compliment! True the 414 is a bit rarer and a bit more expensive than the others($100-130) but they are out there. I believe you can obtain one from SDS
Forum: RV General Discussion/News 02-15-2019, 10:14 AM
Replies: 24
Views: 1,139
Posted By Hartstoc
Nota problem, each pump has a tiny check valve at...

Nota problem, each pump has a tiny check valve at the outlet. My installation will include a big external check valve for each pump like the one just to the left of the pressure guage on my rig. My...
Forum: RV General Discussion/News 02-15-2019, 09:55 AM
Replies: 24
Views: 1,139
Posted By Hartstoc
Test Data!!!- Anatomy of a fuel pump, part 3-

Now that we are getting comfortable flying “electron-dependent” aircraft and have powerful, lightweight lithium batteries at our disposal, I’ve been thinking it is time to find a way to SAFELY...
Forum: RV General Discussion/News 02-14-2019, 09:56 PM
Replies: 7
Views: 1,304
Posted By Hartstoc
Bob- I’m sure you are correct, but it is a matter...

Bob- I’m sure you are correct, but it is a matter of degree. With constant speed, the only oil that makes it into that cavity must enter and leave through the governor with pitch changes, so...
Forum: RV General Discussion/News 02-14-2019, 09:44 PM
Replies: 7
Views: 1,304
Posted By Hartstoc
Bobby- thanks for the link- my purchase of...

Bobby- thanks for the link- my purchase of 4-cases was accepted so if it is indeed delivered, Iíll be in business for quite a while, but the price was dear!- Otis
Forum: RV General Discussion/News 02-13-2019, 12:11 PM
Replies: 7
Views: 1,304
Posted By Hartstoc
Exxon Elite discontinued-

I’ve been using Exxon Elite 20-50 for some time because it contains the Lycoming anti-scuff additive, but the product has been discontinued. Thinking of just going to Aeroshell 100W, though I’ve...
Forum: VAF Classifieds (posts in here deleted after 30 days) 02-11-2019, 03:04 PM
Replies: 2
Views: 673
Posted By Hartstoc
FS: Carburetor and fuel system parts

Most shown here delivered installed on new Superior 180HP O-360 in 2007 and removed for conversion to fuel injection at 366 hours TT. All in perfect working order when last flown 10/31/2018. Other...
Forum: RV General Discussion/News 02-09-2019, 10:08 AM
Replies: 15
Views: 1,079
Posted By Hartstoc
FS Complete Dynon autopilot package RV 7

I have a pair of new in box Dynon servos with install kits for RV-7 that I bought about about one year ago. Also have the AP74 interface for the legacy Dynons new in box with install...
Forum: RV General Discussion/News 02-09-2019, 09:48 AM
Replies: 59
Views: 24,367
Posted By Hartstoc
John-Even better- $14.86 per pair Amazon Prime 2...

John-Even better- $14.86 per pair Amazon Prime 2 day free delivery! So close to free it almost seems suspicious!- Otis
Forum: RV General Discussion/News 02-09-2019, 12:32 AM
Replies: 31
Views: 1,878
Posted By Hartstoc
If the connections at both ends of the cable are...

If the connections at both ends of the cable are sound, a single cable is plenty. If they are poorly done, a second cable installed in the same manner probably wonít help!

I use di-electric grease...
Forum: Alternative Engines 02-08-2019, 10:02 PM
Replies: 270
Views: 32,699
Posted By Hartstoc
Charlie- Nice looking package! Do you happen to...

Charlie- Nice looking package! Do you happen to know the design duty-cycle of this engine? (time permitted at full power, or % power permissible for continuous operation). - Otis
Forum: RV General Discussion/News 02-07-2019, 09:33 AM
Replies: 2
Views: 373
Posted By Hartstoc
Test Rig- Anatomy of a fuel pump- part 2

I’m deleting the engine driven fuel pump from my RV, and the quest for a reliable, appropriately sized, power-efficient electric fuel pump suitable for full-time operation with my Bendix-type...
Forum: RV General Discussion/News 02-04-2019, 04:13 PM
Replies: 5
Views: 951
Posted By Hartstoc
Thank you Kathy- That news really confirms my...

Thank you Kathy- That news really confirms my choice of the EXT 900-VNT! Also, I was happy to discover the two-into-one vent kit you have added to the product line since I bought my pair of 900ís and...
Forum: RV General Discussion/News 02-04-2019, 02:52 PM
Replies: 31
Views: 1,566
Posted By Hartstoc
Just throwing in my personal opinionís 2-cents...

Just throwing in my personal opinionís 2-cents worth here, but i think you have more than adequate refundancy with the left skyview and the D-10. If I were designing this, I would delete the steam...
Forum: Glass Cockpit 02-03-2019, 05:10 PM
Replies: 66
Views: 6,359
Posted By Hartstoc
I’m a BIG fan of the iPad pro’s, but I’m not sure...

I’m a BIG fan of the iPad pro’s, but I’m not sure I’d be comfortable with an aircraft that cannot be safely flown without them, or that relies completely upon air data being successfully sent to and...
Forum: RV General Discussion/News 02-01-2019, 04:34 PM
Replies: 5
Views: 951
Posted By Hartstoc
Kathy- Will this essentially be the ETX900-VNT?...

Kathy- Will this essentially be the ETX900-VNT? I’m currently installing a pair of those incredible batteries in the cabin of my plane to achieve a fully redundant twin battery system designied so...
Forum: RV General Discussion/News 02-01-2019, 09:56 AM
Replies: 14
Views: 3,290
Posted By Hartstoc
Ed- I’m grateful for the benign outcome after...

Ed- I’m grateful for the benign outcome after your experience. Your story made me cringe and immediatly brought to mind the rather light duty(re:lightweight) plastic linkages used between the ...
Forum: RV General Discussion/News 01-31-2019, 09:44 AM
Replies: 12
Views: 1,687
Posted By Hartstoc
I think one positive effect of the nose job, once...

I think one positive effect of the nose job, once it is engaged, is to transfer deflection to a point much higher up on the gear leg, which could change the whole dynamic following an abrupt...
Forum: RV General Discussion/News 01-30-2019, 07:00 PM
Replies: 64
Views: 4,062
Posted By Hartstoc
Another pump option and a new insight-

From what I can tell, the GSN Walbros are indeed the gold standard for in-line pumps for RVís. Ross Farnham mentioned another Walbro model in a PM, the GSN 414, which looks even more promising than...
Forum: RV General Discussion/News 01-26-2019, 06:17 PM
Replies: 64
Views: 4,062
Posted By Hartstoc
Ross- THANK YOU for the photos- they are most...

Ross- THANK YOU for the photos- they are most helpful! The reduced parts count alone argues for the georotor over roller-vane types, so I’m greatly encouraged.

I’m really looking forward to...
Forum: RV General Discussion/News 01-26-2019, 05:53 PM
Replies: 18
Views: 2,098
Posted By Hartstoc
Congratulations! Youíve givenall ofus who love...

Congratulations! Youíve givenall ofus who love RV-aerobatics something to aspire to- well done!
Forum: RV General Discussion/News 01-22-2019, 12:02 PM
Replies: 64
Views: 4,062
Posted By Hartstoc
Charlie- I do not see anything I’ve suggested...

Charlie- I do not see anything I’ve suggested that contradicts what you are saying here, but I think I understand the confusion. I was referencing the erroneous nature of the performance chart...
Forum: RV General Discussion/News 01-22-2019, 09:26 AM
Replies: 64
Views: 4,062
Posted By Hartstoc
Ross- That would be most helpful- I was one of...

Ross- That would be most helpful- I was one of those kids who revelled in taking things apart to see how they work(or donít), and still find that technique hard to beat!-Otis
Forum: RV General Discussion/News 01-21-2019, 08:26 PM
Replies: 64
Views: 4,062
Posted By Hartstoc
The relief valves can be fine tuned to a degree...

The relief valves can be fine tuned to a degree by shimming to compress the spring slightly, or shimming the cap to reduce spring pressure. Altering the length of the body or the spring can do the...
Forum: RV General Discussion/News 01-19-2019, 09:40 AM
Replies: 64
Views: 4,062
Posted By Hartstoc
Alex- I agree completely with everything you say...

Alex- I agree completely with everything you say here. With both pumps operating, which will be standard proceedure for TO&climb, I should have ample fuel flow with a huge surplus. I can also operate...
Forum: RV General Discussion/News 01-18-2019, 01:10 PM
Replies: 64
Views: 4,062
Posted By Hartstoc
Charlie, what you say is true, but in order to...

Charlie, what you say is true, but in order to meet my very high standard of redundancy, I will use most of the hardware shown. I think it is too likely that the tiny checkvalves integral to these...
Forum: RV General Discussion/News 01-18-2019, 12:39 PM
Replies: 64
Views: 4,062
Posted By Hartstoc
Well, however reliable the engine driven pump may...

Well, however reliable the engine driven pump may be, I think getting rid of it is a noble goal, and my abundance of battery power, initially triggered by the dual lightspeeds, makes that possible....
Forum: RV General Discussion/News 01-18-2019, 11:26 AM
Replies: 64
Views: 4,062
Posted By Hartstoc
Alex- A couple of points about why this setup...

Alex- A couple of points about why this setup should work for my particular installation. First, note that these pumps are not expensive and there are higher- output Walbros that could easily be...
Forum: RV General Discussion/News 01-17-2019, 05:23 PM
Replies: 64
Views: 4,062
Posted By Hartstoc
Larry- Your concern is well taken, but my...

Larry- Your concern is well taken, but my “backup” battery will be a fully charged EarthX EXT900VNT rated at 16AH., and these maintain pretty flat Voltage at 13.3 V or so right to the end. Its twin...
Forum: RV General Discussion/News 01-17-2019, 11:32 AM
Replies: 64
Views: 4,062
Posted By Hartstoc
Excellent plan, Bill- Iíll look forward to seeing...

Excellent plan, Bill- Iíll look forward to seeing your results. It is noteworty that results will be very installation-specific, and important to include as many extreme condition scenarios as...
Forum: RV General Discussion/News 01-17-2019, 10:08 AM
Replies: 64
Views: 4,062
Posted By Hartstoc
A big thank you to Ross- after reading Ross’...

A big thank you to Ross- after reading Ross’ post, I found this on the WalbroGSL395
https://media.fotki.com/2v2EQTKhhxBELK5.jpg

It is a much better match to a180HP Lyc than the pumps shown in my...
Forum: RV General Discussion/News 01-16-2019, 05:52 PM
Replies: 64
Views: 4,062
Posted By Hartstoc
I should probably have emphasizedthat my concern...

I should probably have emphasizedthat my concern is mainly with roller-vane pumps operated continuously, as mine will be (unless suggestions here lead me down another path).

I certainly would not...
Forum: RV General Discussion/News 01-16-2019, 05:11 PM
Replies: 64
Views: 4,062
Posted By Hartstoc
Thank you, Dan, I will definitely look into this...

Thank you, Dan, I will definitely look into this option.-Otis
Forum: RV General Discussion/News 01-16-2019, 02:05 PM
Replies: 64
Views: 4,062
Posted By Hartstoc
Bill- Thank you-I could not agree more! My...

Bill- Thank you-I could not agree more! My initial post cosists entirely of questions generated intuitively after examining the innards of this pump. Thourough testing of the limits of any real-world...
Forum: RV General Discussion/News 01-16-2019, 01:46 PM
Replies: 64
Views: 4,062
Posted By Hartstoc
Thanks for this, Larry- no argument! I did...

Thanks for this, Larry- no argument! I did suggest that the scenario I described might be impossible- my purpose here was to toss out every devilís advocate possibility I could imagine and I hope...
Forum: RV General Discussion/News 01-16-2019, 01:39 PM
Replies: 64
Views: 4,062
Posted By Hartstoc
Your points are well taken- the pump photo is...

Your points are well taken- the pump photo is just a tabletop put-together to illustrate the concept, and the actual installation(which Iíll document here later) will be an ultra-stable...
Forum: RV General Discussion/News 01-16-2019, 01:30 PM
Replies: 64
Views: 4,062
Posted By Hartstoc
Charlie- I could not agree more about the...

Charlie- I could not agree more about the importance of scientifically valid testing- this was the essence of much of the work of the CAFE Foundation during my tenure there. At the same time, Iíve...
Forum: RV General Discussion/News 01-16-2019, 12:07 PM
Replies: 64
Views: 4,062
Posted By Hartstoc
You are correct, the dismantled pump is an airtex...

You are correct, the dismantled pump is an airtex E8228. It is externally very similar to those supplied by AP. Don Rivera indicated to me that they no longer use Airtex pumps, but that the Airtex...
Forum: RV General Discussion/News 01-15-2019, 09:56 PM
Replies: 64
Views: 4,062
Posted By Hartstoc
Anatomy of a High-Pressure Electric Fuel Pump.

I’m in the process of installing this fully redundant dual fuel pump assembly with independent external check and relief valves that I’m assembling using exquisite parts obtained from Don Rivera at...
Forum: RV-12/RV-12iS 01-15-2019, 07:42 PM
Replies: 8
Views: 828
Posted By Hartstoc
Iíd try reloading the firmware- my D-120 offered...

Iíd try reloading the firmware- my D-120 offered all six choices after Iupdated and I also switched successfully to the kavlico sensor.
Forum: RV General Discussion/News 01-06-2019, 12:24 PM
Replies: 9
Views: 765
Posted By Hartstoc
Well, As a thinker, reality always trumps...

Well, As a thinker, reality always trumps guidance for me because the one is perfect while the other can be flawed. Thanks to Steveís responses, Iíve concluded that it is best to follow guidance in...
Forum: RV General Discussion/News 01-05-2019, 06:27 PM
Replies: 9
Views: 765
Posted By Hartstoc
Thanks, Steve- it is good to have clarity on...

Thanks, Steve- it is good to have clarity on this. So, if I understand correctly, all other nearby ferrous materials are bad, but these particular bits of steel are good because factory system...
Forum: RV General Discussion/News 01-05-2019, 09:43 AM
Replies: 9
Views: 765
Posted By Hartstoc
Steve- Thank you for these clarifications. I...

Steve- Thank you for these clarifications. I should add one- by “highly magnetic” I was not refering to components that are magnetized, but ones that are strongly attracted to a magnet. I checked the...
Forum: RV General Discussion/News 01-01-2019, 08:49 PM
Replies: 9
Views: 765
Posted By Hartstoc
Magnetic components in Garmin GMU11 connector kit!

I’m in the middle of a major all-Garmin G3X/GTN panel upgrade. Installation instructions for the magnetometer element, the GMU 11, warn against putting it near any ferrous components, even...
Forum: RV General Discussion/News 12-29-2018, 11:31 AM
Replies: 13
Views: 943
Posted By Hartstoc
Go for it!

I would strongly encourage installation of a 3/8” fuel return fitting in the tanks during tank build, even if you end up flying with a plug in it. I’m in the position now of needing to install return...
Showing results 1 to 62 of 201

 
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