Search: Posts Made By: BEC
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Forum: Power Systems
10-14-2008, 06:07 AM
Replies: 127
Views: 22,677
Posted By BEC

OK - here's the same period on the same flight...

OK - here's the same period on the same flight with voltage, throttle, motor winding and battery temperature. Temp A is the winding temperature from a sensor blu-tak-ed to the windings in the back of...
Forum: Power Systems
10-14-2008, 03:37 AM
Replies: 127
Views: 22,677
Posted By BEC

Same data - with speeds!

I was testing the new EagleTree airspeed sensor yesterday and ALSO had the GPS expander aboard. Here is the same graph (pretty much) with the speeds also shown. Note that in general the GPS and...
Forum: Power Systems
10-13-2008, 03:40 AM
Replies: 127
Views: 22,677
Posted By BEC

Here's another one

Same plane, but under almost dead calm conditions. Pretty similar, really. Oh - this battery isn't as good as the other one which is apparent in the short vertical.

I did get a much steeper dive...
10-07-2008, 11:39 PM
Replies: 99
Views: 8,059
Posted By BEC

Nope. Interesting thought, though....

Nope. Interesting thought, though....
Forum: ParkFlyers
10-07-2008, 05:08 AM
Replies: 2
Views: 1,632
Posted By BEC

Hmmm..... with that equipment it needs to be...

Hmmm..... with that equipment it needs to be bigger than a Diddlebug, that's for sure.

Two suggestions: wood kit: Todd's Gym-E ...
Replies: 9
Views: 4,576
Posted By BEC

This of course SHOULD be standard operating...

This of course SHOULD be standard operating procedure for a computer radio with multiple memories (or any transmitter, really). But most of us have to crash a couple of times before we form the...
10-06-2008, 01:54 AM
Replies: 3
Views: 2,522
Posted By BEC

I could probably be persuaded to part with one of...

I could probably be persuaded to part with one of mine at about that price if you need one.
10-01-2008, 11:05 PM
Replies: 99
Views: 8,059
Posted By BEC

Interesting skimming. My first car was a...

Interesting skimming.

My first car was a 1972 Mazda Rx-2 sedan - dark blue with a black vinyl interior - toasty in south central New Mexico in the summer! I got it used as a Jr. in college in...
Forum: Power Systems
09-29-2008, 08:17 AM
Replies: 127
Views: 22,677
Posted By BEC

FDR file e-mailed.

FDR file e-mailed.
Forum: Power Systems
09-29-2008, 12:40 AM
Replies: 127
Views: 22,677
Posted By BEC

OK - here it is

OK Larry,

Here it is: throttle position, RPM, and power all logged. Static runup, part power takeoff, approximately level speed run, approximately level with pull to vertical, then a full power...
Replies: 10
Views: 3,072
Posted By BEC

It's like PCM - each maker has a different coding...

It's like PCM - each maker has a different coding scheme (never mind the different approaches to "spread spectrum") so third party receivers will be difficult. About the only hope I have that someone...
09-28-2008, 05:34 AM
Replies: 4
Views: 3,046
Posted By BEC

Depends on what you want to charge. This one is a...

Depends on what you want to charge. This one is a nice basic charger for up to 1A charge rate - simple and reliable. If you want to balance, you'd need some sort of balancer as well. If you want to...
09-28-2008, 05:27 AM
Replies: 7
Views: 2,015
Posted By BEC

Agree. You can't beat the Cellpro 4 in ease of...

Agree. You can't beat the Cellpro 4 in ease of use or accuracy.
Forum: Power Systems
09-25-2008, 06:40 AM
Replies: 127
Views: 22,677
Posted By BEC

Larry, I have a couple of EagleTree files...

Larry,

I have a couple of EagleTree files that have GPS speed as well as RPM logged (from the SHAFT review on RCG). Interested in those? No throttle setting logged, though.

Motor winding and...
Forum: Power Systems
09-24-2008, 07:24 AM
Replies: 9
Views: 2,311
Posted By BEC

So "G7" is a geared 7T motor, yes. So it's timed...

So "G7" is a geared 7T motor, yes. So it's timed for gearing, which is good. That's the "standard" not the "FAI" wind. The database for ElectriCalc has the Kv of this motor at 2125.

I might start...
09-23-2008, 10:04 PM
Replies: 13
Views: 13,077
Posted By BEC

Another way to get a good deal on this cutter...

Another way to get a good deal on this cutter (though not as good as that the OP got) is to sign up for the Crafts Etc! e-mail list and get one when they have it on sale for 25% off and free...
Forum: Power Systems
09-22-2008, 03:36 PM
Replies: 127
Views: 22,677
Posted By BEC

What Larry's concerned about is that even though...

What Larry's concerned about is that even though the prop unloads to some extent, as energy is drawn from the battery its voltage goes down. You can see this in some of the graphs already posted as a...
Forum: Power Systems
09-22-2008, 07:02 AM
Replies: 9
Views: 2,311
Posted By BEC

Look on the rear end bell. Somewhere there should...

Look on the rear end bell. Somewhere there should be a number of turns either written or stamped. We'll need to know that before we can answer the question well....

Running an 05 on 10 cells/3s is...
Forum: Power Systems
09-22-2008, 05:18 AM
Replies: 127
Views: 22,677
Posted By BEC

I suppose one way to get closer to the answer to...

I suppose one way to get closer to the answer to question 1 is to fly a low powered setup with a BIG battery (so that voltage is "stiff" and sags little) though of course the added weight will work...
Forum: Power Systems
09-22-2008, 03:22 AM
Replies: 127
Views: 22,677
Posted By BEC

Larry, your setup is different than mine. And if...

Larry, your setup is different than mine. And if I understand what you were going to test correctly, you'd reach the zero thrust point dk_aero spoke of much sooner (low-pitched prop).

I'm sure a...
Forum: Power Systems
09-22-2008, 12:25 AM
Replies: 127
Views: 22,677
Posted By BEC

The flights for which I sent you data were seldom...

The flights for which I sent you data were seldom at full power for long and almost never in level cruising-type flight. Places where the power is higher than static are probably vertical climbs....
Forum: ParkFlyers
09-21-2008, 07:33 PM
Replies: 131
Views: 35,141
Posted By BEC

Well, because I'm literally running out of room...

Well, because I'm literally running out of room to keep 'em! The Sonic Liner and one of the Wing Dragons lives in our disused motorhome. Normally two or three of the more frequently flown ones are...
Forum: Power Systems
09-21-2008, 07:21 PM
Replies: 3
Views: 1,709
Posted By BEC

Hmmmm - available locally and built in the USA...

Hmmmm - available locally and built in the USA with great customer support vs. mail-ordered from the far east with little or no customer support? Sounds pretty obvious to me.....
Forum: Power Systems
09-21-2008, 07:15 PM
Replies: 1
Views: 1,511
Posted By BEC

Yes, it was intended for RC aircraft - state of...

Yes, it was intended for RC aircraft - state of the art about 8 or 9 years ago. It could be used with lithium batteries but the low voltage cutoff on Aveox controllers was always set to 50% of the...
Forum: Power Systems
09-21-2008, 06:56 AM
Replies: 127
Views: 22,677
Posted By BEC

The files are in the process of being sent right...

The files are in the process of being sent right now (of course this post slows it down a bit....) Thunderbird says 49% so far.

Oooops - it timed out. I may have to do it in two notes (four...
Forum: Power Systems
09-21-2008, 06:19 AM
Replies: 127
Views: 22,677
Posted By BEC

Larry, I can send more than one file. One...

Larry,

I can send more than one file. One from my trip to Santa Fe has the 9x7.5 prop on the same airplane (but flying at 7000+ feet MSL on an 85 degree afternoon). I'll just have to do it from...
Forum: Power Systems
09-20-2008, 10:52 PM
Replies: 127
Views: 22,677
Posted By BEC

Interesting discussion....some Medusa Oracle data

I actually got to this thread while doing a search on Howard Chevalier's propeller book so as to be able to reply to a query on RCG. BUT....

It just so happens that I've recently done some logging...
Forum: ParkFlyers
09-16-2008, 10:58 PM
Replies: 131
Views: 35,141
Posted By BEC

In approximately decreasing order of how...

In approximately decreasing order of how frequently they get flown lately:

Mountain Models EZ Scout (this gets flown most often of late)
Mountain Models Switchback Senior (really a bit big to be...
Forum: Foamies
09-16-2008, 08:18 PM
Replies: 2,852
Views: 586,805
Posted By BEC

I don't get over here often (I can't even keep up...

I don't get over here often (I can't even keep up with RCG anymore) but I thought you'd be interested to know I saw two variations on this at a Friday morning at Arroyo del Oso park flying session in...
04-02-2008, 05:46 AM
Replies: 27
Views: 7,061
Posted By BEC

The only thing trainer-ish I can think of that...

The only thing trainer-ish I can think of that fits the requirements is the one you're already looking at - the Tyro 150.

The Stevens Aero SHAFT might work - and is a taildragger - if you started...
Showing results 1 to 30 of 61
 


 
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