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Search: Posts Made By: elippse
Forum: Electronic Ignition Systems 09-12-2011, 05:03 PM
Replies: 15
Views: 4,453
Posted By elippse
Good move!

Good move!
Forum: RV-6/6A 09-12-2011, 04:59 PM
Replies: 28
Views: 12,028
Posted By elippse
I think you'll find that the fairing on Jim...

I think you'll find that the fairing on Jim Smith's RV-6 without the louvers is much easier to build. He does 202 at 8000' dalt, 201 mph at 10,000' dalt, on 150 HP, and you can make it out of...
Forum: RV-6/6A 09-12-2011, 04:58 PM
Replies: 28
Views: 12,028
Posted By elippse
I think you'll find that the fairing on Jim...

I think you'll find that the fairing on Jim Smith's RV-6 without the louvers is much easier to build. He does 202 at 8000' dalt, 201 mph at 10,000' dalt, on 150 HP, and you can make it out of...
Forum: RV General Discussion/News 08-23-2011, 05:20 PM
Replies: 1
Views: 1,535
Posted By elippse
I don't remember the results, but we have to...

I don't remember the results, but we have to remember when talking about MAP that we must refer it to static. I've known several people who have claimed really good MAP increases, but what it really...
Forum: Electronic Ignition Systems 08-16-2011, 07:48 PM
Replies: 44
Views: 17,974
Posted By elippse
Can't say as I do, Ross. I'm really not familiar...

Can't say as I do, Ross. I'm really not familiar with more recent automotive systems. The older ones I rread about just had a fixed frequency injection rate and controlled the opening time. The one...
Forum: Safety 08-15-2011, 11:06 PM
Replies: 30
Views: 6,281
Posted By elippse
My typical approach is to fly a 1/2 mile out...

My typical approach is to fly a 1/2 mile out downwind at 120 mph IAS, then turn at the 45? point. I recently caught **** from the tower 'cause they said I wasn't following a "standard" pattern, and...
Forum: Electronic Ignition Systems 08-15-2011, 10:28 PM
Replies: 44
Views: 17,974
Posted By elippse
That's a name I use to describe an EFI that...

That's a name I use to describe an EFI that constantly squirts fuel into the intake manifolds at a high rep rate but in varying periodicity, as opposed to a timed injection, as in mine, which always...
Forum: Electronic Ignition Systems 08-13-2011, 03:36 PM
Replies: 44
Views: 17,974
Posted By elippse
I built a prototype dual-redundant EFI which uses...

I built a prototype dual-redundant EFI which uses timed injection, not a dribbler. It has been flying for at least four years. The injectors only need about 1-2A depending on MAP and rpm, but the 43...
Forum: RV General Discussion/News 08-13-2011, 03:25 PM
Replies: 9
Views: 4,829
Posted By elippse
Keep in mind that extending the wing span will...

Keep in mind that extending the wing span will decrease your roll rate and lower your maximum G. But if you want much better speed at altitude and with higher gross weight, for long cross-country...
Forum: Electronic Ignition Systems 08-09-2011, 09:48 PM
Replies: 44
Views: 17,974
Posted By elippse
Anyone flying with a battery-powered ignition...

Anyone flying with a battery-powered ignition should resolve to get the airplane on the ground with a failure of the main power even though they have a back-up battery. The LSE should have a minimum...
Forum: RV General Discussion/News 08-09-2011, 09:25 PM
Replies: 9
Views: 4,829
Posted By elippse
We should never confuse "design" with...

We should never confuse "design" with "inventing". The Wrights could be said to have invented the airplane, but many have "designed" airplanes based upon the mounds of design data which has been...
Forum: Electronic Ignition Systems 08-06-2011, 10:11 PM
Replies: 4
Views: 1,631
Posted By elippse
I have my two mounted together on the upper-front...

I have my two mounted together on the upper-front of the firewall BUT I have air piped into them and I don't have any hot air under my cowling since all of my cooling air and exhaust is conducted...
Forum: RV General Discussion/News 08-06-2011, 09:55 PM
Replies: 112
Views: 22,047
Posted By elippse
Want To Race by Yellow!

Want To Race by Yellow!
Forum: RV General Discussion/News 07-22-2011, 10:14 AM
Replies: 30
Views: 10,630
Posted By elippse
Howard, you like to calculate the efficiency of...

Howard, you like to calculate the efficiency of my propeller, so I'll give you a little comparison. Van's quotes the TAS of an RV-6 solo with 150 HP at 187 mph at 8000', which I would assume was 2700...
Forum: RV General Discussion/News 07-20-2011, 09:36 PM
Replies: 30
Views: 10,630
Posted By elippse
Prop pitch at a given speed is based upon the...

Prop pitch at a given speed is based upon the design CL. Increase CL for a given speed and HP, the chord and area decrease. As you add more HP for a given drag CD your speed will increase and so will...
Forum: RV General Discussion/News 07-19-2011, 08:50 PM
Replies: 30
Views: 10,630
Posted By elippse
Take and make up some foam shapes that have the...

Take and make up some foam shapes that have the same 3"-4" round airfoil as do most of the CS hubs about 4"-6" long and attach 2 or 3 of them on the side of your plane. Do you think they will add...
Forum: RV General Discussion/News 07-19-2011, 08:45 PM
Replies: 30
Views: 10,630
Posted By elippse
The four-blade was for 250 rpm more than the...

The four-blade was for 250 rpm more than the three-blade, and the latest four-blade was for 250 rpm more than that!
Forum: RV General Discussion/News 07-19-2011, 10:09 AM
Replies: 30
Views: 10,630
Posted By elippse
Sorry, Larry, but that's one of the well-known...

Sorry, Larry, but that's one of the well-known facts that is totally wrong and should have been eliminated long ago. The reason on a CS prop that a three-blade will be slower is that it usually has...
Forum: RV General Discussion/News 07-18-2011, 07:57 PM
Replies: 30
Views: 10,630
Posted By elippse
150 HP RV-6 breaks the 200 mph barrier!

Jim Smith has just sent me some TAS numbers which he obtained after making and installing a streamlined cowl outlet as shown by Vetterman. Jim has a 150 HP Lycoming RV-6 running on auto gas. He...
Forum: RV General Discussion/News 07-12-2011, 03:28 PM
Replies: 15
Views: 5,088
Posted By elippse
I made my own out of a re-sized hair spray can....

I made my own out of a re-sized hair spray can. It didn't work well until I brought in cool outside air to blow on the vapors from the breather inside the separator. This cool air condenses-out the...
Forum: Electronic Ignition Systems 07-11-2011, 04:21 PM
Replies: 44
Views: 17,974
Posted By elippse
It is necessary to advance the timing when...

It is necessary to advance the timing when running less than maximum MAP, due to throttle retard or higher altitude, since the amount of A-F charge in the cylinder is lower and takes longer to burn....
Forum: Electronic Ignition Systems 07-10-2011, 09:21 PM
Replies: 15
Views: 3,231
Posted By elippse
If the MAP line was too restricted, the MAP...

If the MAP line was too restricted, the MAP wouldn't be as high and the unit would be more advanced giving more, not less power. If the EI is operating at TDC the power will be much lower. It isn't...
Forum: Electronic Ignition Systems 07-08-2011, 10:35 AM
Replies: 15
Views: 3,231
Posted By elippse
Basically the symptoms seem to suggest that the...

Basically the symptoms seem to suggest that the unit is not coming out of TDC timing used for starting. This can be verified with a timing light.
Forum: Electronic Ignition Systems 07-05-2011, 09:25 AM
Replies: 15
Views: 3,231
Posted By elippse
I'll provide a little explanation of why there is...

I'll provide a little explanation of why there is an rpm drop when you shut off one ignition. With two mags, the flame-fronts from identically-timed magnetos reaches the center of the combustion...
Forum: RV-3 07-01-2011, 09:13 AM
Replies: 5
Views: 3,033
Posted By elippse
Paul, since you are using individual pipes,...

Paul, since you are using individual pipes, rather than two-into-two or four-into-one, you may want to consider adding extentions on to the two rear cylinder pipes to make them all the same resonant...
Forum: RV General Discussion/News 06-10-2011, 02:17 PM
Replies: 11
Views: 2,856
Posted By elippse
BTW, those aren't true NACA ducts; they are...

BTW, those aren't true NACA ducts; they are quasi-NACA ducts since they have somewhat the same shape but definitely not the true dimensions. And unless you have run some definitive comparitive tests...
Forum: RV General Discussion/News 06-09-2011, 06:56 AM
Replies: 4
Views: 2,177
Posted By elippse
Rocket nozzle

As you rocket scientists know, whenever there is at least a 2:1 pressure ratio across a nozzle the flow through the nozzle is supersonic. Rocket engines use supersonic expansion through an...
Forum: RV General Discussion/News 06-06-2011, 03:28 PM
Replies: 40
Views: 18,283
Posted By elippse
Jim did some tufting of his wingtips when...

Jim did some tufting of his wingtips when approaching a stall and all of them from the break to the tips stayed straight back except the one that went over the outer aileron gap which lifted slightly.
Forum: RV General Discussion/News 06-06-2011, 03:24 PM
Replies: 17
Views: 3,806
Posted By elippse
I try, I try!!!

I try, I try!!!
Forum: RV General Discussion/News 06-06-2011, 08:23 AM
Replies: 17
Views: 3,806
Posted By elippse
Well, I guess I'll have to get out Roget's, or...

Well, I guess I'll have to get out Roget's, or Bill O'Reilly's word of the day, or just a typical Peter Garrison article in FLYING. Besides, I like keeping you guys on your toes. Have you ever seen...
Forum: RV General Discussion/News 06-05-2011, 09:47 AM
Replies: 4
Views: 2,177
Posted By elippse
Basically what I'm suggesting is a type of...

Basically what I'm suggesting is a type of megaphone with an outet aperture of about 7"X1.5" and a length of 6"-7".

The resonant system sounds good on paper, but C.F.Taylor dismisses it. It takes a...
Forum: RV General Discussion/News 06-05-2011, 09:31 AM
Replies: 17
Views: 3,806
Posted By elippse
Cute, cute! That must have been my...

Cute, cute! That must have been my word-of-the-day on my calendar. But that kind really are sickos! Besides; if I had used such a crass phrase as butt-kissers, I might not have gotten it past the...
Forum: Electrical Systems 06-04-2011, 07:59 PM
Replies: 12
Views: 5,843
Posted By elippse
I'm using a circuit which I designed that uses...

I'm using a circuit which I designed that uses two P-channel Mosfets to connect a master battery with an auxiliary battery. It will bring the voltage on the aux battery to within 50-80 milivolts of...
Forum: RV General Discussion/News 06-04-2011, 12:48 PM
Replies: 17
Views: 3,806
Posted By elippse
Concensus

Before I came on this forum I used to participate in a homebuilt discussion group. I soon found that there was a guru who had a bunch of sycophants holding tightly to his ankles. When anyone wrote...
Forum: RV General Discussion/News 06-04-2011, 10:05 AM
Replies: 4
Views: 2,177
Posted By elippse
Acoustic impedance-matched exhaust nozzle

For any of you out there who may have a very good foundation in acoustics, have you ever considered an exhaust nozzle, up close to the cylinder and dumping out the side of the cowling, that would...
Forum: RV General Discussion/News 06-03-2011, 02:05 PM
Replies: 12
Views: 2,934
Posted By elippse
You need to have a prop that maxes at 2700 rpm at...

You need to have a prop that maxes at 2700 rpm at 8000' dalt, at least. your static ought to be about 2100-2200. Get another prop!
Forum: RV General Discussion/News 06-02-2011, 07:30 PM
Replies: 40
Views: 18,283
Posted By elippse
I think you've got it right. My original intent...

I think you've got it right. My original intent for designing these tips for Jim was to get him the most span with higher AR to decrease induced drag up high, with the least area increase and its...
Forum: RV General Discussion/News 06-01-2011, 08:58 AM
Replies: 40
Views: 18,283
Posted By elippse
Bob, from what I've read, in order to get even...

Bob, from what I've read, in order to get even the 82% span efficiency with a square tip, the tip needs a sharp edge along the top surface in order to trip the tip vortex as far out on the tip as...
Forum: RV General Discussion/News 05-31-2011, 01:55 PM
Replies: 40
Views: 18,283
Posted By elippse
I spoke with Jim yesterday and he said that the...

I spoke with Jim yesterday and he said that the tips come off with 17 screws each and he can put the old tips on the same. He thinks he can change out the tips in less than an hour so it would be no...
Forum: RV General Discussion/News 05-30-2011, 12:11 PM
Replies: 40
Views: 18,283
Posted By elippse
I guess I'm somewhat puzzled by the tag that...

I guess I'm somewhat puzzled by the tag that these tips are ugly; I always thought beauty was in the eye of the beholder. Just becuase someone holds that OPINION it doesn't mean it's true, just an...
Forum: RV General Discussion/News 05-28-2011, 03:10 PM
Replies: 40
Views: 18,283
Posted By elippse
C'mon! Aren't there any of you interested in...

C'mon! Aren't there any of you interested in finding out more about the speed improvement by use of different tip designs? We need to get some volunteers to step up!
Forum: RV General Discussion/News 05-26-2011, 08:05 PM
Replies: 40
Views: 18,283
Posted By elippse
Wing-tip comparison

The triangular wing-tips Jim Smith has mounted to his RV-6 have not only increased his speed above 8000' dalt, but also down to at least 4000' dalt. He's getting 2 mph more at 4000' dalt, 3 mph more...
Forum: RV General Discussion/News 05-26-2011, 07:28 PM
Replies: 16
Views: 7,569
Posted By elippse
Dang! You are so right! I was thinking of a...

Dang! You are so right! I was thinking of a 1/4wave dipole being fed at the center and using the beads to act as a balun and remove the antenna currents. The end of the shield, as you mentioned,...
Forum: RV General Discussion/News 05-26-2011, 06:00 AM
Replies: 16
Views: 7,569
Posted By elippse
This will work even better if you put one or...

This will work even better if you put one or several ferrite beads over the end of the shield where it is stripped to prevent currents from the antenna picking-up currents from the long shield run...
Forum: RV General Discussion/News 05-26-2011, 05:53 AM
Replies: 19
Views: 4,217
Posted By elippse
Hi, Chris! I've often recommended it on this...

Hi, Chris! I've often recommended it on this forum, but I think it's too radical for most. It gives the most separation when using two antennae, and from gear legs, prop, and other stuff, and it...
Forum: RV General Discussion/News 05-19-2011, 08:59 AM
Replies: 6
Views: 1,913
Posted By elippse
"Don't know! I'll have to look! Any...

"Don't know! I'll have to look! Any suggestion?
Forum: RV General Discussion/News 05-18-2011, 08:34 PM
Replies: 6
Views: 1,913
Posted By elippse
I also colored a ring for maneuvering speed,...

I also colored a ring for maneuvering speed, which I've never before seen done.
Forum: RV General Discussion/News 05-17-2011, 08:15 AM
Replies: 23
Views: 4,678
Posted By elippse
On previous units working with the high current...

On previous units working with the high current draw Skytec, the prop would stop after passing the first trigger and it would back up and pass this trigger again which gave the spark. To correct this...
Forum: Electrical Systems 05-16-2011, 12:31 PM
Replies: 5
Views: 3,971
Posted By elippse
Actually, Pierre, I don't safety-wire my prop...

Actually, Pierre, I don't safety-wire my prop bolts. I use a stack of four Belleville spring washers two in one direction and two in the other to maintain the over 1000 psi clamping force of the prop...
Forum: RV General Discussion/News 05-16-2011, 12:21 PM
Replies: 23
Views: 4,678
Posted By elippse
Not true! The advance and retard have nothing to...

Not true! The advance and retard have nothing to do with how low the voltage is and if you have enough voltage to turn the starter there is more than enough to power the LSE. LSE will work to below...
Forum: Electrical Systems 05-14-2011, 03:01 PM
Replies: 5
Views: 3,971
Posted By elippse
PTT wiring

It has been mentioned by some that they only use a single insulted wire for their PTT circuit rather that shielded wire and it's never caused a problem. This sort of puts me in mind of a friend who...
Forum: Electronic Ignition Systems 05-13-2011, 04:31 PM
Replies: 9
Views: 2,789
Posted By elippse
'Just talked to Klaus, who's in Germany, and he...

'Just talked to Klaus, who's in Germany, and he said the boxes he sends out now are all configured to put out a +10V pulse. Two of the older EFIS required a different configuration, and as it says in...
Forum: Electronic Ignition Systems 05-12-2011, 09:11 PM
Replies: 9
Views: 2,789
Posted By elippse
'Not sure what version of LSE you have, but the...

'Not sure what version of LSE you have, but the tach output on the latest PIII is on the input connector on 6 and 13, with 6 being the signal and 13 the return. The output comes from an opto-isolator...
Forum: RV General Discussion/News 04-25-2011, 09:10 AM
Replies: 15
Views: 5,461
Posted By elippse
After all, Alexander is an "F-15 mechanic". That...

After all, Alexander is an "F-15 mechanic". That really gives him standing among the aircraft experts, at least with the know-nothing media. 'Think how much more his standing would be if he was a...
Forum: RV General Discussion/News 04-15-2011, 11:41 AM
Replies: 21
Views: 4,889
Posted By elippse
So, you're knocking out the inside of your...

So, you're knocking out the inside of your mufflers so they don't work as mufflers anymore. That means you're carrying around a lot of extra weight that does nothing and probably adds extra...
Forum: RV General Discussion/News 04-11-2011, 12:56 PM
Replies: 1
Views: 1,283
Posted By elippse
Consider where the body gives off most of its...

Consider where the body gives off most of its heat. If you have the outlets at the bottom of the instrument panel in the center pointing at you body, the air will flow past your body and then toward...
Forum: COMM 04-04-2011, 11:11 AM
Replies: 12
Views: 10,908
Posted By elippse
Now as far as metallic paint is concerned, there...

Now as far as metallic paint is concerned, there is no metallic paint that has the surface resistivity of aluninum, copper, silver, or gold. That being the case, any paint with lower conductivity...
Forum: COMM 04-03-2011, 08:19 PM
Replies: 12
Views: 10,908
Posted By elippse
Let's say you have a thin dielectric sheet in...

Let's say you have a thin dielectric sheet in front of an antenna. When the antenna radiates, there will be an in-phase reflection from the nearest surface back toward the antenna, and then there...
Forum: Electrical Systems 04-03-2011, 05:18 PM
Replies: 16
Views: 4,804
Posted By elippse
Of course one of the major requirements in wiring...

Of course one of the major requirements in wiring is to choose the correct wire type - single wire, shielded wire, twisted-pair, or shielded-twisted-pair, appropriate for the function at hand, making...
Forum: RV-4 04-02-2011, 11:10 AM
Replies: 15
Views: 5,775
Posted By elippse
The thing that makes the difference is the amount...

The thing that makes the difference is the amount of mass flow through the prop. More mass flow, more thrust, less delta-v, more efficiency. I designed Jim Smith's three-blade for best cruise. It had...
Forum: RV General Discussion/News 04-02-2011, 10:45 AM
Replies: 11
Views: 3,210
Posted By elippse
On my friend's Lancair when I wired-in one LSE PI...

On my friend's Lancair when I wired-in one LSE PI I used shielded wire from the magneto and used only the shield ground from the magneto case as the ignition ground lead. There is a coaxial fitting...
Forum: RV-4 04-01-2011, 07:26 PM
Replies: 15
Views: 5,775
Posted By elippse
Say what you want from things you have heard, but...

Say what you want from things you have heard, but the more blades you have of a similar planform outline, diameter, and pitch distribution, the more static thrust and the more rate of climb you will...
Forum: RV General Discussion/News 03-31-2011, 09:25 AM
Replies: 4
Views: 1,441
Posted By elippse
Use of cellophane tape to build up immediately...

Use of cellophane tape to build up immediately behind the port will increase pressure at the port and lower the IAS. Conversely, adding tape in front of the port will lower the port pressure and...
Forum: RV-4 03-30-2011, 09:14 PM
Replies: 15
Views: 5,775
Posted By elippse
Each blade intercepts a certain mass based upon...

Each blade intercepts a certain mass based upon the diameter. With more blades, you get more mass flow. Since efficiency is a result of the velocity of air which is thrown back, and since thrust is...
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