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Search: Posts Made By: hevansrv7a
Forum: RV General Discussion/News 08-25-2017, 06:46 PM
Replies: 10
Views: 2,119
Posted By hevansrv7a
Range

Well, don't count on a low-drag intake to increase your range much but it could help a little. That's not from increased MP, just lower pumping losses.

Assume a 42 gallon startup with maybe 40 by...
Forum: RV General Discussion/News 08-25-2017, 06:37 PM
Replies: 10
Views: 2,119
Posted By hevansrv7a
More than 1" over ambient at 200 mph

I can't compare to other setups but my 7A with Sam James cowl and air box, K&N filter, gives well over 1" greater than ambient at around 8000' DA and 200 mph.

My numbers are from many observations...
Forum: RV-10 09-30-2016, 10:35 AM
Replies: 5
Views: 1,568
Posted By hevansrv7a
picture of how I did it

This was my solution to the problem I had with my C-150 with all the switches where I could not even see them. The breaker/switches are on one piece of removable .063 aluminum and easy to get to from...
Forum: Propellers 08-22-2016, 01:35 PM
Replies: 64
Views: 23,794
Posted By hevansrv7a
re: Jack Norris

I second that. Jack is always interested in chatting with fellow aviators. I just sent him an email and a voice mail to draw his attention to this thread. He was at AirVenture this year and still...
Forum: RV Ongoing Maintenance Issues 08-11-2016, 10:08 AM
Replies: 25
Views: 4,380
Posted By hevansrv7a
There have been a few assertions that are, I...

There have been a few assertions that are, I think, meant to suggest that either I'm wrong about how (or how well) the dehumidifier works or even if there is a need. Most or all of those assertions...
Forum: RV Ongoing Maintenance Issues 08-09-2016, 05:04 PM
Replies: 25
Views: 4,380
Posted By hevansrv7a
dryness works data, sort of

search on "aviation boneyard".
example: https://en.wikipedia.org/wiki/Aircraft_boneyard
Thus I believe that the wide-spread claims have indeed been made, at least in that context and there's a lot of...
Forum: RV Ongoing Maintenance Issues 08-09-2016, 01:33 PM
Replies: 24
Views: 6,820
Posted By hevansrv7a
please see new thread on dehydrators

You don't have to wonder how much, just monitor the color of the indicator beads. Just to clarify, they don't "pull" air from inside the engine. Rather, they push dry air in. Ambient air varies a lot...
Forum: RV Ongoing Maintenance Issues 08-09-2016, 01:27 PM
Replies: 25
Views: 4,380
Posted By hevansrv7a
The beads that came with mine are, as noted,...

The beads that came with mine are, as noted, sprinkled with indicator beads which change color. The normal procedure is to put them in a low temp oven for a while until they turn fully blue again.

I...
Forum: RV-12 08-08-2016, 07:36 PM
Replies: 3
Views: 1,270
Posted By hevansrv7a
up to you?

Let's assume that the ring is for emergency use in a situation where you have concluded the engine is going to remain silent and you want to find an airport ASAP. The airport you select must be...
Forum: RV Ongoing Maintenance Issues 08-08-2016, 06:25 PM
Replies: 25
Views: 4,380
Posted By hevansrv7a
Rust vs Us

I have posted regarding dehydrators before but I thought perhaps it would be best to isolate the subject and to offer some evidence that I think reasonably supports my assertion that we should use...
Forum: RV Ongoing Maintenance Issues 08-08-2016, 05:54 PM
Replies: 24
Views: 6,820
Posted By hevansrv7a
blow it out your..

I hope this is meant as a joke. The air in the crankcase is so humid it will yield precipitation when it cools. Each time you fly.

While a frequently flown plane is a good idea, the oil has mostly...
Forum: Traditional Aircraft Engines 08-08-2016, 05:47 PM
Replies: 15
Views: 2,618
Posted By hevansrv7a
Target EGT

Nigel is giving the best answer, IMHO. That terminology comes from the GAMI bunch. I have my target EGT pasted on my panel right next to my EFIS screen. I don't recall if he's using the method of...
Forum: RV Ongoing Maintenance Issues 08-01-2016, 10:07 AM
Replies: 24
Views: 6,820
Posted By hevansrv7a
Water, oil, heresy

I admit to being a heretic about this but why would you think that water won't evaporate at 170; why would you think it needs to boil? Also, that number for boiling is altitude dependent. Also, the...
Forum: Glass Cockpit 08-01-2016, 07:41 AM
Replies: 6
Views: 1,849
Posted By hevansrv7a
there's an app for that

Why not build your own using the checklist feature of Notes app?
Forum: Tools 06-23-2016, 10:23 AM
Replies: 10
Views: 3,060
Posted By hevansrv7a
The Egyptians knew how

When I had an addition built on my house the builder was doing the basic foundation and framing and used a very expensive, fancy digital/optical level. He got it about 1/4" wrong over about 30'. I...
Forum: Tools 06-23-2016, 10:17 AM
Replies: 10
Views: 3,060
Posted By hevansrv7a
Stanley Fat Max

I have several levels (apps) on my iPhone but only the Stanley among the free ones that I've found has the ability to be properly calibrated in the same way as my dedicated level. That is, you rotate...
Forum: Flight Testing 06-22-2016, 07:20 PM
Replies: 28
Views: 14,378
Posted By hevansrv7a
2 different responses in one

1. The whole x96 series through at least 496 do that. However, they are reporting the result of a calculation from sink rate and ground speed. Therefore the best use of that instrument for this...
Forum: RV General Discussion/News 05-04-2016, 10:48 AM
Replies: 35
Views: 8,642
Posted By hevansrv7a
humidity and corrosion

When you burn gasoline in air you produce a lot of water vapor as a normal and essential component of the exhaust. In all engines but especially in our air cooled ones, a significant amount of that...
Forum: RV General Discussion/News 05-03-2016, 06:17 PM
Replies: 35
Views: 8,642
Posted By hevansrv7a
Bill (and everyone), it could be and likely is...

Bill (and everyone), it could be and likely is true. However there is the analytical problem of a self-selected test group. In other words, someone who is willing to put expensive, scientifically...
Forum: RV General Discussion/News 05-03-2016, 06:13 PM
Replies: 35
Views: 8,642
Posted By hevansrv7a
some heretical thoughts on oil in aviation engines

1. If the problem you want to address is that you don't fly often enough then I suggest that regardless of the oil you use you'd be well advised to invest in an engine dehydrator. I won't go into...
Forum: Traditional Aircraft Engines 03-27-2016, 07:11 PM
Replies: 24
Views: 4,558
Posted By hevansrv7a
Not how you do it?

I'm rusty, but my recall says that the degrees EGT are not the correct way to know if they are peaking together. That's because each sensor's placement and the somewhat different characteristics of...
Forum: RV General Discussion/News 03-11-2016, 03:47 PM
Replies: 32
Views: 8,311
Posted By hevansrv7a
Easy check

First, I subscribe to the belief that the NTPS 3-way spreadsheet is best. Kevin Horton gave us that, I think. Thanks, Kevin.

However, GRT says to calibrate their instrument to TAS by finding a...
Forum: RV General Discussion/News 03-10-2016, 03:08 PM
Replies: 9
Views: 2,731
Posted By hevansrv7a
Question what makes it gyroscopic

I don't get it. What makes it gyroscopic vs previous battery powered screwdrivers?
Forum: Propellers 01-25-2016, 05:23 PM
Replies: 10
Views: 4,348
Posted By hevansrv7a
I might have one for sale

I have one with only a few hours on it that is just slightly too much prop for my 7A's 180 HP. If you have more HP it could be a very good prop.

I'm open to any fair offer.
Forum: Flight Testing 11-01-2015, 07:15 PM
Replies: 27
Views: 7,375
Posted By hevansrv7a
SFC suggestion

Finding SFC

1. Figure out how to read the Lycoming power charts including corrections for altitude and temperature. For me, this is the hardest part.

2. Pick a flight condition around 65% and make...
Forum: Flight Testing 11-01-2015, 07:00 PM
Replies: 27
Views: 7,375
Posted By hevansrv7a
CAFE and Carson

from: http://cafefoundation.org/v2/aboutcafe_orderfromchaos.php

(emphasis in red added by me)

Carson Speed: “The Least Wasteful Way of Wasting”

Professor Bud H. Carson of the U.S. Naval Academy,...
Forum: Flight Testing 10-27-2015, 05:36 PM
Replies: 27
Views: 7,375
Posted By hevansrv7a
Carson's

Carson speed is usually expressed in CAS.

Carson defines it but in fact, it is 1.316 x V L/D max. This is well established.

My beef is with the difference between a Carson speed derived from zero...
Forum: RV Ongoing Maintenance Issues 10-06-2015, 05:54 PM
Replies: 26
Views: 5,390
Posted By hevansrv7a
But what about the valve cap?

My problem was that my SJ wheel fairings are so close to the tire that I can't get my fingers up in there to remove the valve cover (the little black rubber dingus to keep dirt out). I made one out...
Forum: RV General Discussion/News 09-13-2015, 10:41 AM
Replies: 35
Views: 5,353
Posted By hevansrv7a
IIRC 15-20 kts IAS for my 7A.

IIRC 15-20 kts IAS for my 7A.
Forum: RV General Discussion/News 08-30-2015, 01:15 PM
Replies: 33
Views: 4,967
Posted By hevansrv7a
no

I am working on an article about that but the short answer is "NO". The commenter that pointed out that the Garmin handhelds show glide ratio is also correct and that is a very good way to go as it...
Forum: RV General Discussion/News 08-30-2015, 10:14 AM
Replies: 11
Views: 3,463
Posted By hevansrv7a
flat drag curve?

I agree about AOA. How do you support the idea that an RV has a "flat drag curve"?

Induced does not follow the rules? Parasite? I don't get it.
Forum: RV General Discussion/News 08-30-2015, 10:07 AM
Replies: 33
Views: 4,967
Posted By hevansrv7a
CAFE numbers

CAFE's test for those numbers was with an idling prop, not stopped, not zero thrust and not windmilling.

If they had done a zero thrust test like they did with the 6A, in my mathematical opinion,...
Forum: RV General Discussion/News 08-30-2015, 09:26 AM
Replies: 33
Views: 4,967
Posted By hevansrv7a
best glide vs minimum sink

Yes, they are very different. In a no-thrust (not the same as zero thrust) situation, the speed for minimum sink will be approximately 76% of the speed for best glide. Said another way, best glide...
Forum: RV General Discussion/News 08-29-2015, 11:02 PM
Replies: 33
Views: 4,967
Posted By hevansrv7a
It depends. A lot!

In this reply I am only going to address best glide. Along with all the less obvious factors is the big one: what is the prop doing?

Here is an example. Look at the CAFE propless glide test for the...
Forum: RV-12 07-27-2015, 01:03 PM
Replies: 24
Views: 10,368
Posted By hevansrv7a
Post 6A glide data

CAFE tested the 6A and got a best L/D of 11.39.

Just saying..
Forum: RV General Discussion/News 06-17-2015, 06:20 PM
Replies: 122
Views: 25,776
Posted By hevansrv7a
Will there be a "kitty" so I can bring a...

Will there be a "kitty" so I can bring a well-known guest who is not an RVer. I'd be happy to pitch in.
Forum: RV General Discussion/News 06-11-2015, 05:33 PM
Replies: 117
Views: 26,030
Posted By hevansrv7a
HP for 160 kts may be..

My "triangle tool" is just a spreadsheet that uses accepted math and is not necessarily going to reflect reality. However, I have found that it's pretty close most of the time.

I set it up with some...
Forum: RV General Discussion/News 06-11-2015, 09:21 AM
Replies: 117
Views: 26,030
Posted By hevansrv7a
More of my OCD on this (smile)

Dave, I am only too glad to offer my OCD-ness and I'm grateful anyone even reads it!

If I recall correctly, you had a RV 7 or 7A that ran LOP almost a full gallon per hour better than mine at the...
Forum: RV General Discussion/News 06-10-2015, 07:33 PM
Replies: 117
Views: 26,030
Posted By hevansrv7a
SFC for Superior

For DA=8000 when Temp=57 your pressure altitude had to be 6615 as opposed to actual altitude of 5900. The equivalent MAP is thus 22.2.

For the MAP you may be getting with ram effect, using 1.0",...
Forum: RV General Discussion/News 06-07-2015, 07:42 PM
Replies: 117
Views: 26,030
Posted By hevansrv7a
I offer this only for what it's worth as my...

I offer this only for what it's worth as my engine and airplane are slightly different.

At 8,000 PA and standard temperature the ambient MP would be 22.2 (which you can exceed with ram effect). This...
Forum: Propellers 10-18-2014, 07:41 PM
Replies: 10
Views: 2,618
Posted By hevansrv7a
Just my two cents

I think you have it pretty close to perfect. Try it at about 10,000 density altitude. If you can get it to near 2700 then you are at your best cruise at an allowable-all-day power. Your climb numbers...
Forum: Engine Monitors 08-26-2014, 07:01 PM
Replies: 21
Views: 4,205
Posted By hevansrv7a
ditto what Ross said!

A very wise answer from a very knowledgeable guy.
Forum: Engine Monitors 08-26-2014, 06:48 PM
Replies: 21
Views: 4,205
Posted By hevansrv7a
both or neither

Your MAP shows 21.2 which is 73% of 29.0. My reading of manufacturer charts reveals that they rate 100% at 29, not 29.92.

But your RPM is 95.5% of the usual 2700 for maximum power.

73% times 95.5%...
Forum: Propellers 08-05-2014, 06:03 PM
Replies: 0
Views: 736
Posted By hevansrv7a
Exclamation Were you at Jack Norris's Prop forum at AV14?

Jack Norris gave two presentations at AirVenture 2014. The first was titled “A Master’s Course..” and the second was titled “Props Nailed Easy”. At each he collected names and $10 per name for a...
Forum: RV General Discussion/News 06-13-2014, 08:35 PM
Replies: 44
Views: 9,517
Posted By hevansrv7a
my experience fwiw

I put mine as far aft as possible in the "arm rest" on my 7A. This gets the wires away from any flying activities/motions and is good from that POV. However, if you need to plug/unplug in flight,...
Forum: RV General Discussion/News 10-31-2013, 11:46 AM
Replies: 0
Views: 701
Posted By hevansrv7a
Updated "the tool"

For the handful of you who have looked at or used this spreadhsheet, I have posted a new version in a SkyDrive folder for VAF and the link to the folder...
Forum: RV-12 10-19-2013, 06:07 PM
Replies: 7
Views: 2,613
Posted By hevansrv7a
Updated Tool

I posted the very latest version of my "TriangleTool" XLS at:
http://sdrv.ms/1a2fB7v
And it is a public link to a folder for this forum (or is supposed to be).

I got a well intended PM from a member...
Forum: RV-12 10-18-2013, 08:50 PM
Replies: 7
Views: 2,613
Posted By hevansrv7a
A work of mine in progress

First, take a look at the various versions of my "TriangleTool" because it will help you get a set of numbers that will be able to be true at the same time. This idea will make more sense after you...
Forum: Safety 09-15-2013, 05:43 PM
Replies: 1
Views: 715
Posted By hevansrv7a
New Product - work on canopy?

I have no connection to this product. I am posting it because I think it could be important to self-rescue in RV's, especially those with canopies.

Question: would the spring loaded window-breaker...
Forum: Propellers 09-15-2013, 11:27 AM
Replies: 12
Views: 1,794
Posted By hevansrv7a
What should it cost?

Walt, what would be a fair price for it when done well by a qualified person?
Forum: RV General Discussion/News 09-05-2013, 07:36 PM
Replies: 7
Views: 1,744
Posted By hevansrv7a
Thumbs up Thanks to aZ_gila!

The O-ring worked perfectly. I selected one from the hardware store which was easy to stretch and with an I.D. small enough to put some pressure on the hose. After which, I RTV'd the heck out of...
Forum: Propellers 09-04-2013, 09:19 AM
Replies: 0
Views: 603
Posted By hevansrv7a
Let's gather some good prop data

This is only for the RV12 guys with the ground adjustable Sensenich props.

It would be useful to the community as a whole and also to some research that I am doing on which Jack Norris is acting...
Forum: RV General Discussion/News 08-31-2013, 04:53 PM
Replies: 7
Views: 1,744
Posted By hevansrv7a
Brilliant!

Wow, why didn't I think of that? Don't answer :).

That is the kind of solution I needed, I think. Thanks much!
Forum: RV General Discussion/News 08-30-2013, 08:03 AM
Replies: 7
Views: 1,744
Posted By hevansrv7a
Attach Tube to Static Port - How?

I put my static ports in the wrong place when I built my airplane. Now I am installing new ones in the correct location per DWG 28.

The inside diameter of my vinyl tubing is, according to the...
Forum: Propellers 08-18-2013, 11:19 AM
Replies: 5
Views: 3,105
Posted By hevansrv7a
Kiwi Props

I have not given an update because I have not had anything concrete to say. However, the prop that John McGinnis designed has been redesigned and John tells me that there will be a production version...
Forum: Safety 08-02-2013, 06:46 PM
Replies: 70
Views: 11,033
Posted By hevansrv7a
3rd degree burn

I was wearing my wedding ring and tightening the positive terminal clamp on the battery with my left hand. My ring contacted the wrench and the wrench contacted the aluminum at the port aft corner of...
Forum: RV General Discussion/News 07-01-2013, 07:20 PM
Replies: 22
Views: 4,428
Posted By hevansrv7a
Thinking cautiously

Once at OSH I was chatting with a guy who was even older than I am. We were comparing techniques for the C-150. He said he always landed without flaps so that he'd know how to do it if the flap motor...
Forum: RV General Discussion/News 06-29-2013, 08:14 PM
Replies: 12
Views: 3,087
Posted By hevansrv7a
want to share some data?

I would love to know your calibrated airspeed at minimum power for level flight and your weight at that point.

CAS is IAS plus or minus error. You can get there backwards with GPS giving you TAS...
Forum: Traditional Aircraft Engines 06-27-2013, 08:49 PM
Replies: 23
Views: 4,445
Posted By hevansrv7a
humbly disagree on a detail

First, I want to express my gratitude to the Advanced Pilot folks and Walter in particular for the very patient help I've been given.

Since I agree on the latter point, here's the data to support my...
Forum: Safety 06-25-2013, 02:25 PM
Replies: 54
Views: 8,279
Posted By hevansrv7a
stall warning noise

That's good and commendable but not helpful in my case:
1. My AOA ( LRI) is entirely independent of electrics and that is on purpose
2. I already have a GRT system
3. The Cessna system is also...
Forum: Traditional Aircraft Engines 06-24-2013, 07:07 PM
Replies: 23
Views: 4,445
Posted By hevansrv7a
The short version of a paper I will write someday

I've been spiraling around this issue for a couple of years and I'm still not happy with what I "know". It's a surprisingly difficult subject.

But no less an authority than Walter Atkinson has told...
Forum: Safety 06-21-2013, 05:55 PM
Replies: 54
Views: 8,279
Posted By hevansrv7a
That is the one I don't like.

The one on my C-150 was inside the wing and you had to suck on it to test it.
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