VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.


Go Back   VAF Forums > Search Forums
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Showing results 1 to 64 of 273
Search took 0.01 seconds.
Search: Posts Made By: Freemasm
Forum: Fuel Injection Systems Today, 11:06 AM
Replies: 5
Views: 98
Posted By Freemasm
Check with your OEM

What are your concerns about heated fuel?

Making some assumptions here: guessing your FI system will utilize redundant vane pumps and be back pressure-regulated. Fuel velocity is...
Forum: Traditional Aircraft Engines Yesterday, 08:44 AM
Replies: 20
Views: 2,053
Posted By Freemasm
We need a metallurgist to comment and ultimately...

We need a metallurgist to comment and ultimately amp up the willies you just cast upon me from my college past. Your summary sounds correct for case hardening but I remember it being deeper, in the...
Forum: RV General Discussion/News 04-09-2021, 06:19 PM
Replies: 20
Views: 695
Posted By Freemasm
It is a pump suction side phenomenon. Related...

It is a pump suction side phenomenon. Related losses are proportional to the square of the flow (all other things kept constant). Downstream pressure really doesnít come into play.
Forum: RV General Discussion/News 04-09-2021, 03:00 PM
Replies: 20
Views: 695
Posted By Freemasm
Using round numbers and assuming everything else...

Using round numbers and assuming everything else remains the same:

Fuel line fluid velocity is ~53ft/sec at 10gpm
The head difference of ~ 2 ft causes a head differential of ~0.65 psi (SG of...
Forum: RV General Discussion/News 04-09-2021, 02:19 PM
Replies: 20
Views: 695
Posted By Freemasm
Wow. Bullet dodged. I would have had a higher...

Wow. Bullet dodged. I would have had a higher suspicion if you had straight Mogas. A fifty-fifty blend is a bit of a surprise.

Iíd consider trying to find what the local temps are around the fuel...
Forum: RV General Discussion/News 04-08-2021, 01:27 PM
Replies: 20
Views: 695
Posted By Freemasm
I was also thinking about RVP issue. Would love...

I was also thinking about RVP issue. Would love to experiment with this one but not worth it.

In a different application, you'd fill one tank with 100LL and see if it goes away. Accidents tend to...
Forum: RV General Discussion/News 04-08-2021, 10:26 AM
Replies: 20
Views: 695
Posted By Freemasm
More details needed. Anything unique about your...

More details needed. Anything unique about your fuel system config? Are you using aviation fuel? etc.

Making some assumptions:

Doubtful = fuel system leak prior to main fuel pump
More likely = Your...
Forum: RV Ongoing Maintenance Issues 04-06-2021, 08:56 PM
Replies: 16
Views: 783
Posted By Freemasm
It is a pretty consistent 27 psi until the boost...

It is a pretty consistent 27 psi until the boost pump is energized; then 48 to off scale high. The boost pump output makes the engine pump op benign as it should. My money is on the boost pump relief...
Forum: RV Ongoing Maintenance Issues 04-06-2021, 07:50 PM
Replies: 16
Views: 783
Posted By Freemasm
Been doing some digging

Let me state again that I don’t have experience with traditional or legacy type mechanical FI systems but have been doing some studying. The boost pump is probably a vane type (positive...
Forum: RV General Discussion/News 04-06-2021, 05:57 AM
Replies: 3
Views: 437
Posted By Freemasm
I don't know the reasoning for potentially...

I don't know the reasoning for potentially shortening the blade on the stall switch. It actuates on "flow reversal" (for lack of better words) once the flow stagnation point moves below blade on the...
Forum: RV Ongoing Maintenance Issues 04-05-2021, 08:25 AM
Replies: 16
Views: 783
Posted By Freemasm
Here goes nothing

Thanks for that info and it makes some sense. If the bellows force and resultant system pressure is provided by an internal spring and engine only provides the required "reset", the engine driven...
Forum: RV Ongoing Maintenance Issues 04-03-2021, 01:51 PM
Replies: 16
Views: 783
Posted By Freemasm
Sorry, I'm out of my element

This non-return type of FI system appears to be the legacy style. Sorry but I can't speak to the specifics of it but I have designed a lot of fluid systems for aerospace and power generation. Here's...
Forum: RV Ongoing Maintenance Issues 04-02-2021, 01:37 PM
Replies: 16
Views: 783
Posted By Freemasm
Give us details of your system fuel configuration...

Give us details of your system fuel configuration e.g what kind of FI system do you have; is it full flow with back pressure regulator, etc?

Apply Occam's Razor. (could be something as simple as a...
Forum: Traditional Aircraft Engines 04-02-2021, 09:20 AM
Replies: 17
Views: 743
Posted By Freemasm
My opinion. Shim it to proper alignment and know...

My opinion. Shim it to proper alignment and know that you have some future margin when the sag sets in.
Forum: Rocket 03-30-2021, 04:05 PM
Replies: 6
Views: 289
Posted By Freemasm
Iíll settle

How about just an approximate roll stick deflection? Would love to mount/configure the Garmin AP roll servo. The servo range of motion must exceed (just barely) that if the control column. If you...
Forum: Rocket 03-30-2021, 01:28 PM
Replies: 6
Views: 289
Posted By Freemasm
Control stick range of motion

Forgive me if this is listed anywhere in the miriad of drawings and docs. If it is, I haven't found it.

Anyone know the degrees of motion for the stick related to both axis?

I know "it depends"...
Forum: Rocket 03-28-2021, 12:36 PM
Replies: 4
Views: 243
Posted By Freemasm
Glare shield underside color

Note: this is not an interior color choice thread/debate.


I’ve seen a lot of various pix. What color did you utilize for the underside of your glare shield?

My thought was a non-reflective...
Forum: RV General Discussion/News 03-25-2021, 08:10 AM
Replies: 6
Views: 474
Posted By Freemasm
Don't guess or rely on anecdotal info. Determine...

Don't guess or rely on anecdotal info. Determine the OEM of the pump, not the supplier, and review their official releases. It's more than micron rating. DeltaP versus flow, capacity/surface area,...
Forum: Traditional Aircraft Engines 03-19-2021, 07:31 AM
Replies: 5
Views: 458
Posted By Freemasm
The whole system, technically. Really depends on...

The whole system, technically. Really depends on your approach. I'm sticking with Reid vapor issues versus material compatibility. A (formerly) typical mechanical engine driven pump with a booster...
Forum: Traditional Aircraft Engines 03-19-2021, 06:08 AM
Replies: 5
Views: 458
Posted By Freemasm
Someone else will chime in. The powerplant is...

Someone else will chime in. The powerplant is actually the easy part of this equation. The airframe is full of potential gotcha's. Do a search here and other for Reid Vapor Pressure/Mogas/etc. The...
Forum: Propellers 03-15-2021, 03:41 PM
Replies: 11
Views: 1,231
Posted By Freemasm
For my benefit

For my benefit, did the prop have any balance moves done while in its old/current again position? Changing clocking after balancing (even 180 deg) would certainly have an effect. Let us know if you...
Forum: Propellers 03-15-2021, 10:07 AM
Replies: 11
Views: 1,231
Posted By Freemasm
A question, please

I obviously can't know all of the details/variables. The prop OEM probably made the suggestion for clocking probably based upon "standard" assumptions; fixed timing I.A.W. engine OEM nameplate,...
Forum: Rocket 03-15-2021, 07:22 AM
Replies: 9
Views: 1,710
Posted By Freemasm
Forming is finished, finally. Assuming itís...

Forming is finished, finally. Assuming itís better to delay the riveting for now to ease access. Something to think about for future builders at this junction, taping an 0.125 (thickness = builder...
Forum: Alternative Engines 03-11-2021, 03:51 PM
Replies: 95
Views: 9,202
Posted By Freemasm
@David Z.Think about it another way. The props...

@David Z.Think about it another way. The props were set wrong increasing the counter torque required at their input shafts. Thus, the engine couldn't make or increase horsepower. Not having all of...
Forum: Alternative Engines 03-11-2021, 02:04 PM
Replies: 95
Views: 9,202
Posted By Freemasm
I could do another bulletized reply but I'll let...

I could do another bulletized reply but I'll let the previous posts speak for themselves. I will say again that no one will argue validity of the aforementioned simple mathematical relationship. I...
Forum: Alternative Engines 03-11-2021, 11:12 AM
Replies: 95
Views: 9,202
Posted By Freemasm
Guess I can be snarky too

Mr. Farnham. Understanding the differences and relationships between force/work/power/energy puts one's understanding of related ahead of most. Still, people hear what they want to hear; see what...
Forum: Alternative Engines 03-11-2021, 07:27 AM
Replies: 1
Views: 419
Posted By Freemasm
NASA sponsored GAP Engine

Previous thread triggered some ancient memories. Does anyone remember the NASA GAP program? Continental won the development bid with a (2 stroke?) design. The specs called for Jet A fueled engine to...
Forum: Alternative Engines 03-11-2021, 06:39 AM
Replies: 95
Views: 9,202
Posted By Freemasm
My line of thinking is more in line with David...

My line of thinking is more in line with David Z's. You can never divorce the two co-dependents but consider this. This is true in any system but more evident in synchronous or constant rpm...
Forum: Alternative Engines 03-10-2021, 07:57 PM
Replies: 95
Views: 9,202
Posted By Freemasm
I’ve got to be careful here as I’m discussing...

I’ve got to be careful here as I’m discussing something with someone who is well respected by everyone including myself. HP is a factor of torque and rpm. It is as co-dependent a relationship as...
Forum: Traditional Aircraft Engines 03-10-2021, 07:25 PM
Replies: 5
Views: 1,017
Posted By Freemasm
JB Ball at Continental. You deal directly with...

JB Ball at Continental. You deal directly with the OEM. If interested, let me know and Iíll PM you the contact info. Mine is being crated up this week.
Forum: Alternative Engines 03-10-2021, 01:44 PM
Replies: 95
Views: 9,202
Posted By Freemasm
There would appear to me to be even more that...

There would appear to me to be even more that creates questions.

The listed stroker kits make some some pretty substantial HP gain claims but no mention of torque improvements. Is there a torque...
Forum: Rocket 03-08-2021, 06:05 AM
Replies: 9
Views: 1,710
Posted By Freemasm
@Robertcropdust. Did you have the forward...

@Robertcropdust. Did you have the forward windscreen before deciding on that GS shape? Wondering if there's extra material on the plexi to account for the various shapes.
Forum: Rocket 03-07-2021, 12:32 PM
Replies: 9
Views: 1,710
Posted By Freemasm
Anybody want to share some pix of their final GS...

Anybody want to share some pix of their final GS shapes? Any rationales, gothcaís, things they would have changed etc? Would be greatly appreciated.
Much Thx.
Forum: Traditional Aircraft Engines 03-07-2021, 08:23 AM
Replies: 10
Views: 1,506
Posted By Freemasm
Don’t decide in a vacuum. Is your crankshaft...

Don’t decide in a vacuum. Is your crankshaft dampened? Will your propeller be OK with the higher power pulses? Got to look at the whole system to avoid any potential expensive mistakes.
Forum: Rocket 03-05-2021, 08:22 AM
Replies: 9
Views: 1,710
Posted By Freemasm
As you know, laterally the required curve between...

As you know, laterally the required curve between the forward and rear of the glare shield is significantly different. The only somewhat tricky part is trying to keep some clearance between the WS...
Forum: RV Ongoing Maintenance Issues 03-05-2021, 06:00 AM
Replies: 6
Views: 712
Posted By Freemasm
Replace it.

Replace it.
Forum: Rocket 03-04-2021, 09:49 AM
Replies: 9
Views: 1,710
Posted By Freemasm
Anyone ever done this?

I've calmed down some now. I've done plenty of shrinking/stretching in the past. I was trying to tweak the glare shield for clearance at the windshield bow. The stretcher tore the 032; unfortunately...
Forum: Propellers 03-03-2021, 12:15 PM
Replies: 24
Views: 3,025
Posted By Freemasm
More but of course won't know until it's almost...

More but of course won't know until it's almost completely done. Published weight for a 300-3B/A-72 is 36#s. That's a big delta at that station. There is no 330xxx on the WW website. This may be teh...
Forum: Propellers 03-03-2021, 11:31 AM
Replies: 24
Views: 3,025
Posted By Freemasm
Still probably won't work from a W&B standpoint...

Still probably won't work from a W&B standpoint for Rocket Lites (four banger Rockets). Hopefully I'll be surprised.
Forum: Traditional Aircraft Engines 03-03-2021, 09:15 AM
Replies: 7
Views: 1,300
Posted By Freemasm
Pardon me for being one of "those" people that...

Pardon me for being one of "those" people that quote anonymous sources. I don't have a position, just passing along some info. Most of the experiences I've had with Superior cylinders, both directly...
Forum: Propellers 03-03-2021, 07:04 AM
Replies: 24
Views: 3,025
Posted By Freemasm
@Whirlwind Propellers. Help us out here. My build...

@Whirlwind Propellers. Help us out here. My build and others will probably fall into a product black hole. The new 300 series stated performance looks great. It will probably be too lightweight for...
Forum: Propellers 03-03-2021, 06:55 AM
Replies: 19
Views: 1,759
Posted By Freemasm
As far as I'm concerned, Bloomerjohn's reputation...

As far as I'm concerned, Bloomerjohn's reputation is zero'd out and he has hurt the integrity of MT propellers at least in the short term. He has a direct link to MT in his profile. It's great that...
Forum: RV General Discussion/News 03-02-2021, 08:45 PM
Replies: 12
Views: 1,229
Posted By Freemasm
ACS East is one state away from me. I too have...

ACS East is one state away from me. I too have been seeing items as in stock - East only to see otherwise at checkout. I placed an order and never got a shipping notification. Inquired with ACS and...
Forum: RV General Discussion/News 02-28-2021, 04:04 PM
Replies: 8
Views: 989
Posted By Freemasm
Florida flyer here

Iíve owned aircraft in Florida for over thirty years. Fog, fog, fog (after you paint the aircraft) and youíll have no problems.
Forum: Rocket 02-27-2021, 12:37 PM
Replies: 9
Views: 1,710
Posted By Freemasm
Glare shields s@ck

Wasting a lot of aluminum here. The glare shield is a bit ďspecialĒ as the forward part has to be formed to follow the contour of the airframe while the back most edges are nearly straight to clear...
Forum: Propellers 02-24-2021, 11:11 AM
Replies: 19
Views: 1,759
Posted By Freemasm
"untested." Strong and inaccurate word. I came...

"untested." Strong and inaccurate word. I came from certified Mooney world. There are great products and complete trash in both certified and EAB fleets. I am an anal AF engineer and have been...
Forum: RV General Discussion/News 02-22-2021, 07:33 PM
Replies: 5
Views: 736
Posted By Freemasm
Guessing Slicks accidentally timed to the retard...

Guessing Slicks accidentally timed to the retard point.
Forum: RV General Discussion/News 02-21-2021, 03:26 PM
Replies: 17
Views: 847
Posted By Freemasm
They all run together on me these days. The...

They all run together on me these days. The strictest Iíve dealt with were for NASA. Those were the first I had to utilize and probably the most strict. Those specs were actually derived from the old...
Forum: RV General Discussion/News 02-21-2021, 12:54 PM
Replies: 17
Views: 847
Posted By Freemasm
It doesnít have to be a lock washer, safety wire,...

It doesnít have to be a lock washer, safety wire, etc. If one of the surfaces has ďlocking teethĒ or similar, that complies. Iíll state again, if a fastener canít be torqued from either side...
Forum: RV General Discussion/News 02-21-2021, 08:27 AM
Replies: 17
Views: 847
Posted By Freemasm
Any single sided fastener (if you canít torque...

Any single sided fastener (if you canít torque for either side) must have a locking feature or safety installed. This screw would qualify as/need such unless you put a nut on the back side. If not...
Forum: RV General Discussion/News 02-16-2021, 06:12 AM
Replies: 8
Views: 734
Posted By Freemasm
Way back, it probably helped keep the lineman's...

Way back, it probably helped keep the lineman's pants clean and dry when parking such an an aircraft carrier
Forum: Rocket 02-14-2021, 08:04 AM
Replies: 8
Views: 827
Posted By Freemasm
Same here

The DJM quad and throttle I mentioned are from Flyboyís. Probably the same thing as you.
Forum: Rocket 02-12-2021, 09:20 AM
Replies: 8
Views: 827
Posted By Freemasm
Much thanks to all that responded.

Much thanks to all that responded.
Forum: Rocket 02-09-2021, 11:07 AM
Replies: 8
Views: 827
Posted By Freemasm
Linking throttles and other

I've got ideas but a new thread was needed here anyway. What methods (please share details) did you previous builders use to link the front and back seat throttles? Bowden cable? Make a rod...
Forum: Alternative Engines 02-08-2021, 11:53 AM
Replies: 95
Views: 9,202
Posted By Freemasm
Apples, Oranges, and other fruit

Particulate (soot) is not a green house gas though it does contribute to acid rain. Current carbon capture (think CO2 primarily) approaches are mostly exclusive to ChemE processes. You can't make a...
Forum: Alternative Engines 02-08-2021, 06:11 AM
Replies: 95
Views: 9,202
Posted By Freemasm
Very doubtful

Electricity is far more economical and safe to transport (transmit) than a pipeline of H2. Tankering would be even more expensive and probably bring the total cycle efficiency to near zero; this...
Forum: Alternative Engines 02-07-2021, 03:51 PM
Replies: 95
Views: 9,202
Posted By Freemasm
Caught myself, sort of.

I basically was one of those holes who make statements without any substantiation. So, here is a copy of a previous post of mine with some facts and stats:

The Majority of Economics of Renewable...
Forum: Alternative Engines 02-07-2021, 03:32 PM
Replies: 95
Views: 9,202
Posted By Freemasm
If someone believes in the economics or the...

If someone believes in the economics or the “greenness” of Hydrogen, you should
Invest your retirement savings In it. I did energy balances for a living, H2 makes zero environmental or economic sense.
Forum: Rocket 02-07-2021, 12:56 PM
Replies: 12
Views: 2,631
Posted By Freemasm
Canít speak for the 4

On Rockets (based on the 4), the doubler is between the side skin and the top longeron/cockpit rail. Pick up existing holes between the aforementioned.
Forum: RV-8/8A 02-04-2021, 08:00 PM
Replies: 22
Views: 2,300
Posted By Freemasm
For consideration

First off, Iím not trying to convince anyone that my approach is better. This is another option the OP may wish to consider. Iím having a Titan IO-370 (straight valve Lycoming) being built this...
Forum: Traditional Aircraft Engines 02-04-2021, 01:38 PM
Replies: 13
Views: 1,361
Posted By Freemasm
Yes Sir. My brief and poorly worded response was...

Yes Sir. My brief and poorly worded response was specific to the RVP property. The typical engine in the subject Piper has no problem with the lower Octane. As Iím sure you know, thatís only the...
Forum: Traditional Aircraft Engines 02-04-2021, 09:15 AM
Replies: 13
Views: 1,361
Posted By Freemasm
Depends.

Haven’t read that particular STC; however, usually one each is required for airframe and power plant. Making a low wing airframe acceptable for Mogas is typically not a complex undertaking. A high...
Forum: Reviews 01-27-2021, 11:18 AM
Replies: 17
Views: 2,494
Posted By Freemasm
What am I missing?

Do you have a question or concern?
Forum: RV General Discussion/News 01-19-2021, 07:38 PM
Replies: 27
Views: 2,416
Posted By Freemasm
I am aware, Sir. Sorry if I'm being dense but I'm...

I am aware, Sir. Sorry if I'm being dense but I'm going to be stubborn here. Bare with me.

For a given RPM, the IC engine is a constant volume machine. (Probably) No one will argue that. The...
Showing results 1 to 64 of 273

 
Forum Jump

All times are GMT -6. The time now is 02:25 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.