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Search: Posts Made By: feihu-RCU
Showing results 1 to 25 of 245
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06-24-2006, 04:57 PM
Replies: 33
Views: 2,872
Posted By feihu-RCU

RE: What CAD program do you use?

winglift

I have been designing and flying RC airplanes since the early 70s, and I recently did a free download of Turbo CAD Learning edition. After going thru the 240 page manual a few times,...
06-24-2006, 03:26 PM
Replies: 3
Views: 922
Posted By feihu-RCU

RE: Opening dxf files in TurboCad Learning edition2

Rainedav
I don't get the same Open Window that you show, and the version I have is the Windows V4. Anyway, I did find a way to drag-n-drop into the Turbo Cad Drawings File to open a dxf file.
...
06-23-2006, 05:23 PM
Replies: 3
Views: 922
Posted By feihu-RCU

Opening dxf files in TurboCad Learning edition2

I have downloaded the Free TurboCad Learning Edition2. For the process of learning CAD, I was able to draw plans for a Parkflyer and save it in the dxf file type for sharing. However there is nothing...
Forum: Aerodynamics
05-28-2006, 12:09 PM
Replies: 18
Views: 1,721
Posted By feihu-RCU

RE: Crosswind effect

Well said, Gremlin Castle, from a retired ATP.

feihu
05-04-2006, 12:57 AM
Replies: 2
Views: 489
Posted By feihu-RCU

RE: TRIM QUESTION

I say add a little more downthrust to all motors, flight test, and add more or less until the plane flies level at half throttle. No need to add right thrust unless the airplane pulls to the left.
...
05-04-2006, 12:49 AM
Replies: 3
Views: 949
Posted By feihu-RCU

RE: Top Flite School Master and Esskay 400

Built and flew the Schoolmaster with a Cox 049 and a single channel radio called the Robot during the early 70s. Excellent flyer and got many, many pleasant hours flying it.
I think a geared 400...
Forum: Aerodynamics
05-02-2006, 02:47 PM
Replies: 10
Views: 1,474
Posted By feihu-RCU

RE: Uncoordinated Rudder Turns?

What you're seeing is a tail low characteristic during the turn which is probably normal for the Porterfield.
The fact that the tail seems to be hanging down is due to the lateral profile and the...
Forum: Aerodynamics
04-30-2006, 08:19 PM
Replies: 11
Views: 911
Posted By feihu-RCU

RE: Old C.G. location

Wm:

I assume there is no way of lightening the tail.
Move the wing back, moves the CG back, but to add ballast fwd will move the CG fwd again.
Rather than add fwd ballast, you might work...
04-30-2006, 05:07 PM
Replies: 6
Views: 999
Posted By feihu-RCU

RE: 115V-AC to 12V-DC question

I believe that the standard stryker charger is the 1.5amp variable peak charger. If this is the case, Radio Shack has a 12v/1500mah ac to dc power adapter, cat# 237-1779 for $25 that might suit your...
Forum: Aerodynamics
04-03-2006, 08:43 PM
Replies: 44
Views: 3,710
Posted By feihu-RCU

RE: Flap Help?!!!! Am I wrong Or Right?

Hi:
Here is part of a page from the 1965 Cessna 150 Owner's Manual.
feihu
03-12-2006, 08:55 PM
Replies: 14
Views: 947
Posted By feihu-RCU

RE: How long should full charge take?

The 1.4 factor applies when you charge at C/10 which in your case is 100ma. Charging at C/10 is considered trickle charging, and the battery does not overcharge at this rate (100ma).

Charging at...
03-11-2006, 08:53 PM
Replies: 14
Views: 947
Posted By feihu-RCU

RE: How long should full charge take?

Most batteries are normally charged at one tenth its capacity for 14 hrs.
Your capacity (C) is 1000mah, so it should be charged at 100ma. A 1.4 factor is normally used to account for electrical...
03-07-2006, 08:15 PM
Replies: 13
Views: 702
Posted By feihu-RCU

RE: JR charger needed.

Just be aware, The JR charger for the transmitter is reverse polarity from that of most all other brands.

feihu
03-06-2006, 08:53 PM
Replies: 6
Views: 587
Posted By feihu-RCU

RE: AC adaptor charger - how long is too long?

Just a note of caution:
Be aware that a charge current of 300ma can overcharge your 600ma battery.
I suggest that you check the battery during charge at intervals by holding it in your hand for...
03-06-2006, 11:44 AM
Replies: 7
Views: 607
Posted By feihu-RCU

RE: chager question, please let me know

On second thought, the source voltage is 24v and the labeled output is 19.2v and therein lies the 5v differential voltage required for charging.
I expect that your charger should perform as...
Forum: The Clubhouse
03-05-2006, 08:01 PM
Replies: 17
Views: 1,299
Posted By feihu-RCU

RE: Painting Foam

I heard somewhere that acrylic paint (craft type) does not attack foam. It can be watered down and applied with a brush.
03-05-2006, 01:16 PM
Replies: 7
Views: 607
Posted By feihu-RCU

RE: chager question, please let me know

Your original post said you have a "19.2v wall charger" - is this the specs for that charger?

You can definitely charge one 7.2v1500mah pack with this charger.
You may be able to charge two...
03-04-2006, 05:46 PM
Replies: 5
Views: 935
Posted By feihu-RCU

RE: "Forming" Charge for 6 volt Receiver Pack

aviationinfo:

1200mah/50ma = 24 hours
add 1.4 factor and you have 24 x 1.4 = 33.6 hrs.

I was assuming your transmitter charger output was 60ma which is 1/10 of a 600mah capacity and...
03-03-2006, 04:17 PM
Replies: 5
Views: 935
Posted By feihu-RCU

RE: "Forming" Charge for 6 volt Receiver Pack

aviationinfo:

I will assume that your "basic wall charger" is your radio charger which has a transmitter putput and a receiver output. The receiver output generally operates from 6v which is...
03-03-2006, 12:11 PM
Replies: 10
Views: 679
Posted By feihu-RCU

RE: Reducing charge rate

John:

I messed up on my original post and have since revised it.

Had the decimal in the wrong place for figuring the wattage, and it bothered me since I hadn't needed that large wattage...
03-02-2006, 10:33 PM
Replies: 10
Views: 679
Posted By feihu-RCU

RE: Reducing charge rate

Rob:
Yes you can just add a resistor in the circuit to reduce the charge rate. And yes, you could first measure the actual charge current .

Sorry fellas but I messed up on this original post...
01-24-2006, 02:01 PM
Replies: 3
Views: 576
Posted By feihu-RCU

RE: use 2s or 3s lipos for Speed 300 motor?

Thanks sitNfly, and thanks Time Pilot for your replies.

Looks like the speed 300 is not practical with lipos, so I'll just stay with what I got.

feihu
01-21-2006, 11:00 PM
Replies: 3
Views: 576
Posted By feihu-RCU

use 2s or 3s lipos for Speed 300 motor?

I have the graupner (GR3306) Speed 300 6v motor w/ 5:1 gear ratio and 8x6 prop. On 9.6v Nicads, it draws 10 amps for 15 oz thrust.
How do I make the voltage adjustment for lipos?
Do I go to 2s...
01-19-2006, 10:59 PM
Replies: 4
Views: 1,009
Posted By feihu-RCU

RE: 280 motor and batteries

Don't know how big or how heavy the Micro Whiz is.
Here is a 280 w/ 4.5:1 gear, 9x7 apc prop on 8 cells 350mah Nicads: it gets off the ground easily and it flys well.

feihu
01-17-2006, 05:34 PM
Replies: 3
Views: 472
Posted By feihu-RCU

RE: Charger for Small NiCad Batteries?

rrengineer:
If you use a tx-rx radio charger (9.6v and 4.8v @ 500-600 ma), you can use a dropping resistor to achieve 11 ma and 50-60 ma for your two cells. Since you're using 2 rather then 4 or 8...
Showing results 1 to 25 of 245
 


 
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