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Search: Posts Made By: rv6ejguy
Forum: Alternative Engines Today, 01:11 PM
Replies: 106
Views: 10,081
Posted By rv6ejguy
I suspect the Rotax case was pretty challenging...

I suspect the Rotax case was pretty challenging without flywheel inertia. The gearing helps to keep residual thrust low but some folks still wish it could be less. I have some time in a CT and it was...
Forum: Alternative Engines Today, 09:37 AM
Replies: 6
Views: 863
Posted By rv6ejguy
Karl Grove in California was talking about this a...

Karl Grove in California was talking about this a year and a half ago. Wondering if the project is still ongoing or shelved?

Pre-selling something that hasn't been flight proven yet apparently seems...
Forum: Alternative Engines Today, 09:31 AM
Replies: 106
Views: 10,081
Posted By rv6ejguy
I bring it up only to illustrate that even with...

I bring it up only to illustrate that even with all of their engineering and funds available, Rotax didn't solve the TV issue down low, they do what all of us are doing- avoid idling in the resonant...
Forum: Alternative Engines Yesterday, 12:57 PM
Replies: 106
Views: 10,081
Posted By rv6ejguy
I've been involved with several belt PSRUs also...

I've been involved with several belt PSRUs also on Subarus, very similar lower resonance RPM range. It's always there, regardless of flywheel mass and fairly different prop MMOIs too, just varies in...
Forum: Alternative Engines Yesterday, 10:01 AM
Replies: 106
Views: 10,081
Posted By rv6ejguy
Yes, almost all 4 cylinder engines I've seen with...

Yes, almost all 4 cylinder engines I've seen with PSRUs exhibit a noticeable TV period in this 900 to 1200 rpm range roughly, including the Rotax 912. There may be other periods above this range as...
Forum: Alternative Engines 12-04-2022, 06:21 PM
Replies: 6
Views: 863
Posted By rv6ejguy
Higgs Powered RV-10

It's been about 18 months since a story came out about the Higgs V-4 installation progressing in an RV-10.

Anyone know if it's flown yet?
Forum: Fuel Injection Systems 12-03-2022, 03:53 PM
Replies: 34
Views: 8,652
Posted By rv6ejguy
Update

Testing continues on the EM-6 board. We're refining the new closed loop and trim code as well as adding some new diagnostic code, figuring it's better to get the latter done before initial release...
Forum: Electronic Ignition Systems 12-02-2022, 02:09 PM
Replies: 11
Views: 959
Posted By rv6ejguy
Magneto timing can easily be off several degrees...

Magneto timing can easily be off several degrees from wear or lack of maintenance. How much does Hartzell worry about this?

Many EIs can have the timing user adjusted through external means, PMag,...
Forum: RV General Discussion/News 12-02-2022, 01:02 PM
Replies: 12
Views: 1,311
Posted By rv6ejguy
Hadn't thought of that one...

Hadn't thought of that one...
Forum: RV General Discussion/News 12-02-2022, 09:53 AM
Replies: 12
Views: 1,311
Posted By rv6ejguy
Despite all the ITAR regs, plenty of sensitive...

Despite all the ITAR regs, plenty of sensitive parts find their way to unfriendlies as we see in the latest conflict.

These progress through multiple parties and countries usually before arriving at...
Forum: Alternative Engines 11-29-2022, 06:15 PM
Replies: 106
Views: 10,081
Posted By rv6ejguy
Yup. I can only think of two companies who...

Yup. I can only think of two companies who actually engineered and tested their redrives properly for the Experimental market. All the others were designed with TLAR and most of these have had issues...
Forum: Fuel Injection Systems 11-26-2022, 08:59 PM
Replies: 11
Views: 559
Posted By rv6ejguy
Around 60mm IIRCC.

Around 60mm IIRCC.
Forum: RV Ongoing Maintenance Issues 11-25-2022, 12:25 PM
Replies: 25
Views: 1,809
Posted By rv6ejguy
Shorai. Working fine for Dave Anders, me and a...

Shorai. Working fine for Dave Anders, me and a few others here on VAF years later.
Forum: RV-10 11-24-2022, 09:15 AM
Replies: 7
Views: 972
Posted By rv6ejguy
If you get flutter, it will be a significant...

If you get flutter, it will be a significant issue. The pieces take a long time to reach the ground from 18,000 feet...

It can be done but you need to be fully aware of the TAS limitations at...
Forum: RV General Discussion/News 11-21-2022, 05:11 PM
Replies: 7
Views: 904
Posted By rv6ejguy
My -6A has been flying the the same Packhard...

My -6A has been flying the the same Packhard carbon string type HEI leads for 19 years. Some are tie wrapped together for more than a foot. No issues to date.

Suppression type wires and resistor...
Forum: Electrical Systems 11-21-2022, 09:27 AM
Replies: 13
Views: 1,660
Posted By rv6ejguy
Few alternators will produce their max amperage...

Few alternators will produce their max amperage rating at idle unless they they have a very high belt drive ratio.

My ND requires 5000 rotor rpm to produce 74 amps. 57 amps at 2500 rotor rpm.

In...
Forum: Electrical Systems 11-19-2022, 01:17 PM
Replies: 10
Views: 766
Posted By rv6ejguy
https://aviation-safety.net/database/record.php?id...

https://aviation-safety.net/database/record.php?id=19830602-1

Try resetting the breakers when safely on the ground. It tripped for a reason, likely not spurious...
Forum: Traditional Aircraft Engines 11-18-2022, 06:10 PM
Replies: 20
Views: 1,598
Posted By rv6ejguy
Be sure to clarify which temperatures change...

Be sure to clarify which temperatures change here, CHT or EGT.

More timing will generally increase CHTs and reduce EGTs.

Pre-ignition (auto ignition prior to spark initiation) is a rather remote...
Forum: Alternative Engines 11-15-2022, 09:16 AM
Replies: 106
Views: 10,081
Posted By rv6ejguy
PU doesn't have the same characteristics as...

PU doesn't have the same characteristics as rubber at these frequencies. Be sure you explore that.
Forum: Alternative Engines 11-14-2022, 09:37 AM
Replies: 106
Views: 10,081
Posted By rv6ejguy
I haven't seen an auto flywheel that wasn't...

I haven't seen an auto flywheel that wasn't located by a central spigot or counter bore.

The Egg Subaru drives also didn't use the factory dowel pins on the engine for location and required an...
Forum: Alternative Engines 11-13-2022, 09:20 AM
Replies: 106
Views: 10,081
Posted By rv6ejguy
Companies with good morals issue a SB and offer...

Companies with good morals issue a SB and offer free replacement parts to remedy the problem to their affected customers.

This demonstrates they actually care about their customers more than...
Forum: Alternative Engines 11-12-2022, 06:13 PM
Replies: 106
Views: 10,081
Posted By rv6ejguy
Nothing much has changed in the last 15 years...

Nothing much has changed in the last 15 years since the Subaru days. Bring problems out into the open which could injure people and you're vilified.

TLAR/TLAW engineering isn't a good approach for a...
Forum: RV General Discussion/News 11-12-2022, 12:01 PM
Replies: 21
Views: 1,863
Posted By rv6ejguy
In this vid we take Les Kearney's -10 to 20,000...

In this vid we take Les Kearney's -10 to 20,000 feet and look at ROP/LOP fuel flows. It performed fine up there.

https://www.youtube.com/watch?v=FgXH-1VJl44

Had my 6A to 15,500 once. The turbo...
Forum: Alternative Engines 11-12-2022, 09:54 AM
Replies: 106
Views: 10,081
Posted By rv6ejguy
Jan might spend a lot of time "thinking" about...

Jan might spend a lot of time "thinking" about these things but he actually still doesn't understand much about either topic as evidenced by poor design after poor design he puts out. Cutting his...
Forum: Alternative Engines 11-10-2022, 02:10 PM
Replies: 40
Views: 3,080
Posted By rv6ejguy
The belly of the -6 isn't flat, slightly V shaped...

The belly of the -6 isn't flat, slightly V shaped (guess Van's wasn't thinking about someone mounting something there...) so I had to seal the gap on both sides with fairly high density open cell...
Forum: Alternative Engines 11-10-2022, 08:56 AM
Replies: 40
Views: 3,080
Posted By rv6ejguy
On the RV, you have the floor ribs separating the...

On the RV, you have the floor ribs separating the belly skin from the seat pan skins with a couple inches of air space so no way much heat is reaching the interior.
Forum: Alternative Engines 11-09-2022, 09:38 PM
Replies: 40
Views: 3,080
Posted By rv6ejguy
Yes, the bar and plate HX you see there is the...

Yes, the bar and plate HX you see there is the oil cooler which is a bad choice again if you want to reduce drag. My flow bench tests show about 35% more pressure drop (drag) for this type of HX over...
Forum: Alternative Engines 11-09-2022, 09:08 PM
Replies: 40
Views: 3,080
Posted By rv6ejguy
With enough power to exceed Vne in level flight...

With enough power to exceed Vne in level flight easily, it would not seem to be worth the trouble to recess the HX into the fuselage given the number of mods required, especially to the control...
Forum: Alternative Engines 11-09-2022, 02:46 PM
Replies: 40
Views: 3,080
Posted By rv6ejguy
Heat in the cockpit would indicate a sealing...

Heat in the cockpit would indicate a sealing issue with the duct.

The Thunder Mustang duct wasn't laid out well internally, though it looks beautiful on the outside. Notice the lack of attention to...
Forum: Alternative Engines 11-09-2022, 01:36 PM
Replies: 40
Views: 3,080
Posted By rv6ejguy
A few shots from mine which you've probably seen.

A few shots from mine which you've probably seen.
Forum: Alternative Engines 11-09-2022, 01:25 PM
Replies: 40
Views: 3,080
Posted By rv6ejguy
Looks good. I might stagger the coolant inlet and...

Looks good. I might stagger the coolant inlet and outlet to get more even flow across the tubes.

Be sure not to wet the tanks or top/bottom supports with airflow, just more drag.

Dimensions are...
Forum: Alternative Engines 11-09-2022, 12:48 PM
Replies: 40
Views: 3,080
Posted By rv6ejguy
With the RV-3, you won't be running high power...

With the RV-3, you won't be running high power for very long in the climb before you're into forbidden airspace there if I recall so you might not need to size for extended climbs at 85 knots. Should...
Forum: Alternative Engines 11-09-2022, 12:24 PM
Replies: 40
Views: 3,080
Posted By rv6ejguy
Here are a couple photos for ideas. You might...

Here are a couple photos for ideas. You might have room under the Subie for a decent duct if you can afford the weight FWF.
Forum: Alternative Engines 11-09-2022, 12:01 PM
Replies: 40
Views: 3,080
Posted By rv6ejguy
There was a clean RV-8 in Oz with an STi using...

There was a clean RV-8 in Oz with an STi using wing rads. I'll see if I can dig up photos.
Forum: Alternative Engines 11-09-2022, 11:06 AM
Replies: 40
Views: 3,080
Posted By rv6ejguy
280 hp in an RV-3 should give you a fair...

280 hp in an RV-3 should give you a fair ROC...:cool:

You'd need about 225 in2 of face area and 500-550 in3 of volume so pretty big scoop if external to the belly skin like my setup is.

Cutting...
Forum: Alternative Engines 11-09-2022, 10:18 AM
Replies: 85
Views: 7,372
Posted By rv6ejguy
Excellent find. I'll pore over that when I have...

Excellent find. I'll pore over that when I have some time. Thanks for posting the link.
Forum: Alternative Engines 11-09-2022, 09:09 AM
Replies: 85
Views: 7,372
Posted By rv6ejguy
Multiple cylinders with no torque reversals (with...

Multiple cylinders with no torque reversals (with much lower mean torque variation), clever engineering (quill shaft in the Merlin for instance), rolling pendulum tech on radials etc.

A 4 cylinder...
Forum: Alternative Engines 11-08-2022, 12:55 PM
Replies: 85
Views: 7,372
Posted By rv6ejguy
Tracy used increased gear backlash to attenuate...

Tracy used increased gear backlash to attenuate the worst TV periods as well. Not sure about flywheel mass. Two big factors which may not be applicable here.

Every engine, gearbox, prop combo will...
Forum: Alternative Engines 11-07-2022, 05:58 PM
Replies: 85
Views: 7,372
Posted By rv6ejguy
A design like this shows a fundamental lack of...

A design like this shows a fundamental lack of understanding in how to design a PSRU. This is TLAW (that looks about wrong). Which is much worse than TLAR even.

Wow, just wow...
Forum: Alternative Engines 11-07-2022, 02:16 PM
Replies: 85
Views: 7,372
Posted By rv6ejguy
Given the fundamental design issues described...

Given the fundamental design issues described here, TV worries might be down the list of things to correct (but still very important).

Again it looks like another case of TLAR engineering (which can...
Forum: Alternative Engines 11-07-2022, 01:06 PM
Replies: 85
Views: 7,372
Posted By rv6ejguy
You can search the forums here. Dan Horton knows...

You can search the forums here. Dan Horton knows a lot about this and helped me out a lot with mine. You must measure or calculate the stiffness and MMOI of each element to do a mathematical...
Forum: Alternative Engines 11-07-2022, 09:31 AM
Replies: 85
Views: 7,372
Posted By rv6ejguy
Having been involved with several types of PSRUs...

Having been involved with several types of PSRUs over many years and performing a theoretical TV studiy on mine, the lack of flywheel inertia on the Viking setups stands out.

I haven't seen any...
Forum: Alternative Engines 11-06-2022, 08:58 AM
Replies: 85
Views: 7,372
Posted By rv6ejguy
The parts look a bit different from this photo....

The parts look a bit different from this photo. Was there more than one design?
Forum: Alternative Engines 11-03-2022, 08:05 AM
Replies: 85
Views: 7,372
Posted By rv6ejguy
When you only have one pump and it fails, the...

When you only have one pump and it fails, the engine stops.

On PT6 engines, the leading cause of inflight shutdowns by far, is the fuel control unit/ fuel pump. On the CF6, that area ties for the...
Forum: Alternative Engines 11-02-2022, 10:00 AM
Replies: 85
Views: 7,372
Posted By rv6ejguy
This thread has drifted pretty far from the the...

This thread has drifted pretty far from the the OP for sure. I've contributed to that as well.:o

Multiple auto OEMs have had multiple issues with GDI hardware in the long (or even short) term....
Forum: Alternative Engines 11-02-2022, 08:32 AM
Replies: 85
Views: 7,372
Posted By rv6ejguy
While many engineers of today think that computer...

While many engineers of today think that computer simulation is a substitute for testing and validation, it isn't. Simulation is a tool to help you get close. Only by building something and testing...
Forum: Alternative Engines 11-01-2022, 09:27 PM
Replies: 85
Views: 7,372
Posted By rv6ejguy
My 20 year old BMWs have 11 to 1 CR with port...

My 20 year old BMWs have 11 to 1 CR with port injection, run fine on 89 octane fuel at this elevation (4000 MSL). My bike is 12.8 to 1. Runs on 87 octane, also port injection. Quite doable by...
Forum: Alternative Engines 11-01-2022, 12:39 PM
Replies: 85
Views: 7,372
Posted By rv6ejguy
I'm no fan of DI, even in new cars as they...

I'm no fan of DI, even in new cars as they frequently come back to haunt you with higher maintenance costs down the road. Wonderful when they are working, not so great when the injectors or HP pumps...
Forum: Alternative Engines 10-31-2022, 09:17 AM
Replies: 51
Views: 10,515
Posted By rv6ejguy
Thanks Dave for your update and usual clear...

Thanks Dave for your update and usual clear reasoning on the various topics under discussion.

Freemasm: I think as prices exceed that of a comparable Lycoming engine, your market progressively...
Forum: Traditional Aircraft Engines 10-31-2022, 08:55 AM
Replies: 10
Views: 970
Posted By rv6ejguy
The drop from 12 to 10 lost some efficiency which...

The drop from 12 to 10 lost some efficiency which Dave was troubled with but he added the EFI and started experiments with induction tuning to try to make that up.

Dedicated race and record attempt...
Forum: Traditional Aircraft Engines 10-30-2022, 01:57 PM
Replies: 10
Views: 970
Posted By rv6ejguy
Dave Anders ran a 12 to 1 AV 360 a few years back...

Dave Anders ran a 12 to 1 AV 360 a few years back and it worked really well at altitude.

Quite workable with variable ignition timing (MAP referenced), you could limit timing just short of...
Forum: RV-12/RV-12iS 10-28-2022, 01:00 PM
Replies: 2
Views: 665
Posted By rv6ejguy
Standard 912 charging system output is 18 amps...

Standard 912 charging system output is 18 amps max.
Forum: Alternative Engines 10-26-2022, 02:14 PM
Replies: 51
Views: 10,515
Posted By rv6ejguy
Sorry, I misunderstood. Agreed this could open up...

Sorry, I misunderstood. Agreed this could open up more possibilities to re-engine big four or small six cylinder powered aircraft, though without flat rating, hp at altitude wouldn't be much...
Forum: Alternative Engines 10-26-2022, 01:24 PM
Replies: 51
Views: 10,515
Posted By rv6ejguy
I too am rooting for them. This is a most...

I too am rooting for them. This is a most interesting and challenging engineering project for a small team.

The big engine, de-rated, pays a weight and cost penalty for sure and depending on...
Forum: Alternative Engines 10-26-2022, 10:54 AM
Replies: 51
Views: 10,515
Posted By rv6ejguy
The thermodynamic rating of some modern large...

The thermodynamic rating of some modern large frame PT6s are about double the flat rating in fact. This allows components sized for better efficiency at altitude though you pay a price down low.

On...
Forum: Alternative Engines 10-26-2022, 07:52 AM
Replies: 51
Views: 10,515
Posted By rv6ejguy
Easy to de-rate or flat rate a turboprop to lower...

Easy to de-rate or flat rate a turboprop to lower power levels as most certified ones are.

Trying to certify this would almost certainly sink the company and open you to much higher liability.
Forum: Alternative Engines 10-24-2022, 10:39 AM
Replies: 85
Views: 7,372
Posted By rv6ejguy
I toyed with the idea of designing a flat 6...

I toyed with the idea of designing a flat 6 geared engine about 10 years ago, around 4L displacement, pushrod, 2 valves per cylinder using as many OTS components as possible- pistons, rockers, rods,...
Forum: Alternative Engines 10-24-2022, 08:14 AM
Replies: 51
Views: 10,515
Posted By rv6ejguy
With the price of Lycomings increasing by leaps...

With the price of Lycomings increasing by leaps and bounds over the last few years, turbines and engines like the Adept V6 may actually start to fit into similar pricing structures soon...

Regen...
Forum: Alternative Engines 10-23-2022, 08:55 PM
Replies: 85
Views: 7,372
Posted By rv6ejguy
It can be more challenging on a four cylinder...

It can be more challenging on a four cylinder where there are torque reversals than a V12 for instance but they still had to deal with TV, not just at the prop gearbox but also at the supercharger...
Forum: Alternative Engines 10-23-2022, 08:48 PM
Replies: 85
Views: 7,372
Posted By rv6ejguy
The same designs were used for civil aviation...

The same designs were used for civil aviation post war, almost every radial is geared, the Merlin evolved for civil and military transport in the form of the Northstar etc. Worked fine for thousands...
Forum: Traditional Aircraft Engines 10-23-2022, 09:32 AM
Replies: 21
Views: 1,691
Posted By rv6ejguy
Good point Mike, timing makes a significant...

Good point Mike, timing makes a significant difference in idle MAP.

The 500 rpm ignition timing shouldn't be set over 10 deg as this slot is used for cranking and we want to avoid any chance of...
Forum: Traditional Aircraft Engines 10-23-2022, 08:32 AM
Replies: 21
Views: 1,691
Posted By rv6ejguy
Cold MAP will always be a bit higher than hot...

Cold MAP will always be a bit higher than hot MAP. The friction of the thick oil on bearings/ shafts/ gears and especially the pistons and rings, means the throttle blade has to be cracked open...
Forum: Alternative Engines 10-22-2022, 01:02 PM
Replies: 85
Views: 7,372
Posted By rv6ejguy
This is the Adept V6 with a spur gear reduction...

This is the Adept V6 with a spur gear reduction drive. It incorporates a cush drive in the upper sprocket. I like the journal element bearings instead of roller/ ball types as these solve many...
Forum: Alternative Engines 10-22-2022, 12:49 PM
Replies: 85
Views: 7,372
Posted By rv6ejguy
Yep, you clipped off my quote: "Best to learn all...

Yep, you clipped off my quote: "Best to learn all you can about TV before you start."
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