WattFlyer RC Electric Flight Forums - Discuss radio control eflight - Search Results

 
Search: Posts Made By: stefanv
Showing results 1 to 30 of 46
Search took 0.01 seconds.
04-14-2013, 02:40 PM
Replies: 17
Views: 8,597
Posted By stefanv

Thanks JetPlaneFlyer, that's what I was going to...

Thanks JetPlaneFlyer, that's what I was going to suggest next. It really bugs me that (a) Microsoft tells us application developers that that's where we should store the user's data, and (b) the user...
04-14-2013, 03:37 AM
Replies: 17
Views: 8,597
Posted By stefanv

That's really odd. As user XXX, the files under...

That's really odd. As user XXX, the files under XXX/Application Data (aka AppData) are YOUR files, so you should be allowed access to them. That is where Microsoft wants developers like us to put the...
04-14-2013, 01:27 AM
Replies: 17
Views: 8,597
Posted By stefanv

They're probably not gone

They're probably not gone. MotoCalc 8.08 stores these in the folder C:\Users\YourUserName\Application Data\MotoCalc 8, whereas older versions stored them in C:\Program Files\MotoCalc8, which Windows...
02-20-2011, 01:37 AM
Replies: 15
Views: 11,164
Posted By stefanv

The plane is too heavy to fly "sedately". If I...

The plane is too heavy to fly "sedately". If I enter the specs into the MotoWizard, and select "Sport" and for performance, MotoCalc finds hundreds of suggestions. Note that currently, the MotoWizard...
01-28-2010, 07:17 PM
Replies: 13
Views: 14,400
Posted By stefanv

If you're going to use a separate Rx battery, you...

If you're going to use a separate Rx battery, you don't need a BEC at all. BEC is only needed if you want to eliminate the Rx battery (BEC = Battery Eliminator Circuit). The Rx battery will usually...
Forum: Power Systems
01-07-2010, 02:37 PM
Replies: 11
Views: 1,707
Posted By stefanv

I didn't look at the examples they gave, just the...

I didn't look at the examples they gave, just the motor specs, where they list maximum Watts as 52W. Gee, I wonder how they achieve that, given the 7.4V maximum voltage and 5A maximum current. The...
Forum: Power Systems
01-07-2010, 03:21 AM
Replies: 11
Views: 1,707
Posted By stefanv

Without knowing exactly what your inputs were to...

Without knowing exactly what your inputs were to the MotoWizard (e.g. desired flying time, performance, etc.) it's hard to comment on MotoCalc's suggestions. However, I have to disagree with...
11-30-2009, 12:30 PM
Replies: 13
Views: 14,400
Posted By stefanv

Both motors will "see" 11.1V. It will actually be...

Both motors will "see" 11.1V. It will actually be somewhat less, because there is an internal voltage drop inside the battery which depends on the current, but both motors will see the same voltage.
11-29-2009, 03:53 PM
Replies: 13
Views: 14,400
Posted By stefanv

No, each motor would produce the same as what a...

No, each motor would produce the same as what a single motor produces, thus giving you twice the power and thrust, but at half the run-time (because you're drawing twice the current). In actuality,...
Forum: Power Systems
11-24-2009, 01:55 PM
Replies: 9
Views: 2,137
Posted By stefanv

Hi Robert: I took your Jedelsky section view...

Hi Robert:

I took your Jedelsky section view and made some measurements on it. It corresponds approximately to a smooth airfoil with a 4% thickness and 2.5% camber. Attached is a screenshot of...
Forum: Power Systems
11-24-2009, 01:34 AM
Replies: 9
Views: 2,137
Posted By stefanv

Future of MotoCalc

Hi Robert:

MotoCalc is alive and well, and we are still actively selling it, supporting our users, and loving it! We routinely get e-mails praising both the product, and our support.

MotoCalc...
Forum: Power Systems
02-25-2009, 03:10 AM
Replies: 0
Views: 707
Posted By stefanv

Measuring Up

I get a lot of e-mails asking how to measure various aspects of electric flight systems, so I've just posted my two-part article from the September and October 2004 issues of QuietFlyer, Measuring Up...
12-21-2008, 04:22 PM
Replies: 9
Views: 2,851
Posted By stefanv

Although the article refers primarily to...

Although the article refers primarily to twisting, braiding has the same effect, and has the additional advantage that it won't come undone, and makes the servo lead very flexible in all directions....
12-20-2008, 03:20 PM
Replies: 9
Views: 2,851
Posted By stefanv

I suspect that winding it like you've shown make...

I suspect that winding it like you've shown make an even better interference-receiving antenna than a loosely wound untidy coil.

I've found that braiding (as opposed to just twisting) servo leads...
12-20-2008, 04:24 AM
Replies: 9
Views: 2,851
Posted By stefanv

I'm not sure. It may actually be...

I'm not sure. It may actually be counter-productive, since a coil can act like an antenna. The neater the coil, the more antenna-like it's going to be. That's not to say you will have problems, but...
12-19-2008, 09:40 PM
Replies: 9
Views: 2,851
Posted By stefanv

info Twisted Wiring for Interference Reduction

I've just posted another of my articles from my QuietFlyer days to my web site. Let's Do the Twist (http://www.stefanv.com/rcstuff/qf200406.html) discusses the root causes of motor-to-radio...
Forum: Power Systems
05-28-2008, 03:28 AM
Replies: 2
Views: 6,742
Posted By stefanv

Exclamation Okay, I've finally had the opportunity to look...

Okay, I've finally had the opportunity to look into this problem. Here's what happened:

The data that Tower Pro provides...
05-27-2008, 07:16 PM
Replies: 2
Views: 1,194
Posted By stefanv

LittleScreamers doesn't publish any constants for...

LittleScreamers doesn't publish any constants for these motors. In fact, we haven't even been able to find any consistent test data for these motors from which constants can be derived.

Stefan...
Forum: Power Systems
05-21-2008, 03:18 PM
Replies: 2
Views: 6,742
Posted By stefanv

We'll look into it immediately. In the mean...

We'll look into it immediately.

In the mean time, we've removed the TowerPro motors from the downloadable data.

Stefan Vorkoetter
Capable Computing, Inc.
http://www.motocalc.com...
Forum: Power Systems
04-14-2008, 03:02 AM
Replies: 12
Views: 2,136
Posted By stefanv

info We've been wanting to add the TowerPro motors to...

We've been wanting to add the TowerPro motors to MotoCalc for quite a while, but until recently, we couldn't find all the data we needed. Now we've found it, and I've just added the TowerPro motors...
04-03-2008, 03:13 PM
Replies: 21
Views: 11,256
Posted By stefanv

Balance could definitely be a problem with modern...

Balance could definitely be a problem with modern motors and batteries, which are typically much lighter than what I used in my SlowPoke way back then.
03-03-2008, 07:20 PM
Replies: 21
Views: 11,256
Posted By stefanv

Great Planes SlowPoke E-Conversion

I've justed posted my July 2000 S&E Modeler review of the Great Planes Slowpoke to my web site. This posting differs from the article that appeared in the magazine in that the posted article is...
11-25-2007, 03:18 PM
Replies: 14
Views: 3,092
Posted By stefanv

To figure it out, your battery either needs to be...

To figure it out, your battery either needs to be explicitly marked with an Ah rating, or a reserve capacity. If it has neither of those, then there's no way to know the Ah rating. You'll have to...
Forum: Power Systems
11-20-2007, 03:57 PM
Replies: 13
Views: 1,934
Posted By stefanv

MotoCalc works fine with outrunners, so long as...

MotoCalc works fine with outrunners, so long as the motor parameters are correct. In the early outrunner days, a lot of the manufacturer-provided data was rather inaccurate, but things have improved...
Forum: Power Systems
10-27-2007, 08:32 PM
Replies: 9
Views: 1,934
Posted By stefanv

There are literally millions of choices, which...

There are literally millions of choices, which MotoCalc narrows down to a few thousand really good ones, and from there weeds out near-duplicates to give you anywhere from a dozen to a few hundred...
10-09-2007, 02:14 AM
Replies: 14
Views: 3,092
Posted By stefanv

I just use a deep cycle marine battery. I recall...

I just use a deep cycle marine battery. I recall it's about 60Ah. But yeah, for 600mAh packs, a 12Ah gel cell is plenty (assuming it's deep cycle).

Stefan
10-09-2007, 12:19 AM
Replies: 14
Views: 3,092
Posted By stefanv

Not really much of a field battery. You could...

Not really much of a field battery. You could charge a 3 cell 4000mAh lithium pack from that only about twice.

Stefan
10-08-2007, 02:35 PM
Replies: 14
Views: 3,092
Posted By stefanv

Re: Stop doing the acid thing

Gel cells don't need their water topped up, but they still need either a constant float charge, or a regular top-up charge, so everything else in the article still applies. After all, they're still...
10-07-2007, 05:37 PM
Replies: 14
Views: 3,092
Posted By stefanv

Arrow Caring for Your Lead-Acid Field Battery

Hello Everyone:

I've just posted an article, based on my May 2003 QuietFlyer article, to my web site. Caring for Your Lead-Acid Field Battery (http://www.stefanv.com/rcstuff/qf200305.html)...
09-09-2007, 09:42 PM
Replies: 0
Views: 1,735
Posted By stefanv

Computer Controlled Battery Manager

I just posted a link about my homebrew computer controlled battery manager in the Batteries & Chargers forum, unaware of the existence of this Electronic Builders forum. Here's a link to the other...
Showing results 1 to 30 of 46
 


 
Forum Jump

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

Page generated in 0.04143 seconds with 7 queries