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Search: Posts Made By: Freemasm
Forum: Traditional Aircraft Engines Yesterday, 08:48 PM
Replies: 11
Views: 483
Posted By Freemasm
Got a down leak compression tester? You can use...

Got a down leak compression tester? You can use the spark plug adapter as a guide. Find the compression stoke with your finger over the opening and get it semi close to TDC. Insert a stiff...
Forum: RV Building Tips/Techniques Yesterday, 02:38 PM
Replies: 17
Views: 438
Posted By Freemasm
@BillL. Drop me a PM for my benefit if you...

@BillL.

Drop me a PM for my benefit if you would, please. You offered great insight and reasoning as always but the question still lingers. If the material is chemically non-reactive, properties are...
Forum: RV Building Tips/Techniques Yesterday, 01:27 PM
Replies: 17
Views: 438
Posted By Freemasm
Educate me

I'm not defending my choices versus others. EZ-Turn/Fuel Lube advertises itself as a sealant and lubricant. It has a long history as such. I've never had a leak in the decades I've used it...
Forum: RV Building Tips/Techniques Yesterday, 11:52 AM
Replies: 17
Views: 438
Posted By Freemasm
EZ Turn/Fuel Lube. I even put a thin film on...

EZ Turn/Fuel Lube. I even put a thin film on gaskets to help them find their seat. Spruce should have it.
Forum: Safety Yesterday, 07:32 AM
Replies: 24
Views: 1,992
Posted By Freemasm
My sincere apologies for the drift. Rambling to...

My sincere apologies for the drift. Rambling to follow. Your current adoption is accurate and apropos but the most popular and probably original saying was:

"In God we Trust: All Others pay...
Forum: Reviews 05-08-2021, 05:28 PM
Replies: 12
Views: 603
Posted By Freemasm
A bit of thread drift but hey, I started the...

A bit of thread drift but hey, I started the thread. You are correct.

Strain and stress are linearly proportional to each other. Strain being deformation (think movement for vibration) per unit...
Forum: Reviews 05-08-2021, 09:41 AM
Replies: 12
Views: 603
Posted By Freemasm
Obviously I donít know all of your difficulties...

Obviously I donít know all of your difficulties from the blog post but a street L out of the selector with the gascolator rotated 180 wouldnít fit? I had to abandon my typical linear thinking to get...
Forum: RV Ongoing Maintenance Issues 05-06-2021, 10:45 AM
Replies: 18
Views: 949
Posted By Freemasm
You'd be wise to replace it, IMO. None of us know...

You'd be wise to replace it, IMO. None of us know the exact fouling agent; however, the Vegas odds are not in your favor regarding returning the element to a condition of any long term...
Forum: Alternative Engines 05-06-2021, 10:09 AM
Replies: 10
Views: 3,130
Posted By Freemasm
Good to hear

It's good to hear that the OEM, AC-Aero is monitoring the forum.

Can you get us smarter on your product? Specifically, your literature mentions Combined Cycle Technology often. The Otto is...
Forum: RV Ongoing Maintenance Issues 05-06-2021, 10:00 AM
Replies: 18
Views: 949
Posted By Freemasm
Is the just a screen or is there any other media....

Is the just a screen or is there any other media. Can't tell from the picuture.

The "Cleaning" procedure from the OEM most certainly had to do with flushing particulate away. Your situation is...
Forum: Alternative Engines 05-04-2021, 07:43 AM
Replies: 12
Views: 1,324
Posted By Freemasm
Thanks BillL IIRC: SFC was 0.75 TBO was...

Thanks BillL

IIRC:

SFC was 0.75
TBO was 1.50
Others for sound power level.
Parts count (cost)
etc.
Forum: Alternative Engines 05-04-2021, 06:21 AM
Replies: 12
Views: 1,324
Posted By Freemasm
Trying to restore some visibility. Anyone have...

Trying to restore some visibility. Anyone have anything to add? When I talked to the Continental reps a month or so ago, the consistent response was "that was before my time." Someone has to know...
Forum: Reviews 04-30-2021, 05:00 PM
Replies: 12
Views: 603
Posted By Freemasm
@RotaVA. This is the first I’d heard but as...

@RotaVA. This is the first I’d heard but as mentioned, I haven’t seen much on line. Per the website, every unit is pressure tested. Of course, they don’t differentiate between a proof test and a...
Forum: Reviews 04-30-2021, 08:09 AM
Replies: 12
Views: 603
Posted By Freemasm
Aerolab Gascolator

First review. There doesn't appear to be much written on this.

Background:

Installing EFI into a Rocket. It will be an electrically dependent aircraft that utilizes dual electric fuel pumps and in...
Forum: RV General Discussion/News 04-29-2021, 04:30 PM
Replies: 3
Views: 333
Posted By Freemasm
If the Facet is like all the others, it is a...

If the Facet is like all the others, it is a positive displacement pump. Actual pump flow varies very little with delta pressure changes. “Excess” flow bypasses back to the pump suction. It ‘s...
Forum: Traditional Aircraft Engines 04-27-2021, 12:18 PM
Replies: 24
Views: 4,614
Posted By Freemasm
An Independent Test

A million years ago when I was an engineer at Kennedy Space Center, I had contacts in the labs there. These were young co-workers/fellow pilots/hot rodders that liked to get their hands on new...
Forum: Alternative Engines 04-25-2021, 09:55 AM
Replies: 10
Views: 3,130
Posted By Freemasm
Smile It hit me and would like to hear other’s with...

It hit me and would like to hear other’s with prop aero expertise. The max prop RPM listed is 1992. I’m also assuming there’s no hydraulics available for prop pitch control. Might be wrong there but...
Forum: RV Ongoing Maintenance Issues 04-23-2021, 11:49 AM
Replies: 8
Views: 517
Posted By Freemasm
You'll get a ton of different opinions but KRoil...

You'll get a ton of different opinions but KRoil is a great penetrant and corrosion lifter/eater. Aero Kroil to be specific. Aerospace techs (unofficially) live by it. It can only help you here.
Forum: RV General Discussion/News 04-23-2021, 11:36 AM
Replies: 14
Views: 668
Posted By Freemasm
@DanH. Yes you've got to cool it but getting the...

@DanH. Yes you've got to cool it but getting the velocity down helps the drops that form fall out but then the tubulation is down so the overall Q drops and the dance goes on. Haven't calculated a...
Forum: RV General Discussion/News 04-23-2021, 08:57 AM
Replies: 14
Views: 668
Posted By Freemasm
Iíve seen PVC used effectively and the cheap,...

Iíve seen PVC used effectively and the cheap, large diameters would help water drop out. Even though itís rated for the pressure, unlike metal a rupture has particularly bad consequences.
Forum: RV General Discussion/News 04-23-2021, 08:27 AM
Replies: 14
Views: 668
Posted By Freemasm
Shop Air Dryer, DIY suggestions?

Anyone have some DIY shop air dryer suggestions/experience they can share? Lots of postings/tutorials/YT vids out there. Wondering what some of you have tried that did/didn't work well. Let me...
Forum: Alternative Engines 04-22-2021, 10:16 AM
Replies: 52
Views: 6,942
Posted By Freemasm
Reference Mr. Farnham's comments above. The...

Reference Mr. Farnham's comments above. The risk/gains/effort equation doesn't make a lot of sense. A straight valve Lycoming with his aforementioned mods can make 210 or more without supercharging...
Forum: RV Building Tips/Techniques 04-21-2021, 08:27 AM
Replies: 2
Views: 256
Posted By Freemasm
Vibration Isolators, Fuel Pump Assembly

I'm laying out my fuel system. My duplex fuel pump assembly will probably be mounted on the vertical web of forward tunnel rib. This will be in a prime position to radiate pump noise into the cabin....
Forum: Tools 04-21-2021, 06:05 AM
Replies: 12
Views: 898
Posted By Freemasm
The longer I live/more I do, the more I...

The longer I live/more I do, the more I appreciate my older tools. Most of the newer affordable stuff is sh!t; hobby grade may be a more PC term. Many times it's engineered to make it through a...
Forum: Tools 04-20-2021, 01:34 PM
Replies: 12
Views: 898
Posted By Freemasm
Replacing the arbor would be my first choice

Replacing the arbor would be my first choice
Forum: RV Ongoing Maintenance Issues 04-19-2021, 10:18 AM
Replies: 9
Views: 751
Posted By Freemasm
My compliments, but

Very nice craftsmanship. Please utilize appropriately. The base(s) are quite narrow. It will take less than most would imagine to knock that over. One ill-timed gust when the hangar doors get opened,...
Forum: Painting your RV 04-15-2021, 02:27 PM
Replies: 5
Views: 530
Posted By Freemasm
Hawk over at Tampa exec does good work.

Hawk over at Tampa exec does good work.
Forum: RV General Discussion/News 04-15-2021, 02:25 PM
Replies: 19
Views: 1,218
Posted By Freemasm
I tried to not comment but, please tell us you...

I tried to not comment but, please tell us you have sufficient electrical architecture for this configuration. Part of the elegance of the vintage configuration is the independent power sources for...
Forum: RV General Discussion/News 04-14-2021, 03:48 PM
Replies: 19
Views: 1,218
Posted By Freemasm
They are positive displacement devices with their...

They are positive displacement devices with their own independent bypass regs/internal valving. No other valving would be reasonably needed.

The original system designs truly were/are examples of...
Forum: Fuel Injection Systems 04-14-2021, 03:37 PM
Replies: 7
Views: 396
Posted By Freemasm
Any issue would occur on the pump(s) suction side...

Any issue would occur on the pump(s) suction side in the negative (gage) pressure zone.

Probably not needed but it's one more reason to keep those heat sinks optimized (fuel tanks full). Your peace...
Forum: Fuel Injection Systems 04-14-2021, 11:06 AM
Replies: 7
Views: 396
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 04-13-2021, 08:44 AM
Replies: 20
Views: 2,392
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: 870
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: 870
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: 870
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: 870
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: 870
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: 18
Views: 1,274
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: 18
Views: 1,274
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: 546
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: 18
Views: 1,274
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: 18
Views: 1,274
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: 18
Views: 1,274
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: 916
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: 410
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: 410
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: 343
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: 561
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: 545
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: 545
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: 1,538
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: 1,538
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: 1,945
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: 10,002
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: 10,002
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: 10,002
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: 12
Views: 1,324
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: 10,002
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: 10,002
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: 1,108
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: 10,002
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: 1,945
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: 1,945
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: 1,653
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.
Showing results 1 to 64 of 303

 
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