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Search: Posts Made By: feihu
Showing results 1 to 25 of 178
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Forum: Batteries & Chargers
06-15-2008, 04:00 PM
Replies: 5
Views: 970
Posted By feihu

RE: NiCd Charging Woes

Barber420:
I have been using, and still use my Astroflight Charger, model 115 (among other chargers that I have).
The ammeter reads the + value that it is charging at, and the - value that it is...
Forum: Foamies! - RC Electric Foam Aircraft
04-27-2008, 12:46 PM
Replies: 8
Views: 1,533
Posted By feihu

RE: My first scrach built foamy!

Strankon:
I suggest you set your CG at 30%mac. You've got to find the mac first. Here's a graphical solution to finding the mac. Make a scale drawing, locate the 30% on the mac, then project it to...
Forum: Foamies! - RC Electric Foam Aircraft
04-26-2008, 02:39 PM
Replies: 8
Views: 1,533
Posted By feihu

RE: My first scrach built foamy!

Strankon:

Nice lookin job and nice proportion of wing and tail areas - BUT, the nose is short and you may have a balance problem even after moving servos, battery, and electronics as far fwd as...
Forum: Electric General Discussion
04-26-2008, 02:20 PM
Replies: 9
Views: 2,609
Posted By feihu

RE: Hitec HS-55 servo mounting screws

2 years on a foam model and still going strong with NO SLOP in the control system.
Works for me.

feihu
Forum: Electric General Discussion
04-25-2008, 04:55 PM
Replies: 9
Views: 2,609
Posted By feihu

RE: Hitec HS-55 servo mounting screws

I wrap maskimg tape around the servo and white glue it to foam in foam airplanes, or epoxy to wood surface in wood constructed airplanes.

feihu
Forum: Electric General Discussion
04-25-2008, 04:47 PM
Replies: 6
Views: 915
Posted By feihu

RE: Understanding Electric: Is the Battery run time dependent on total Amps or Capacity?

n19htmare:

Run time in hours = mah(Ah) divided by motor Amps

Your answer to quertion 1 is:
Run time for battery 1 = 2.2Ah/15A = 0.146 hrs or (.146x60min)= 8.8minutes.
Run time for...
Forum: Scratch Building, Aircraft Design, 3D/CAD
04-22-2008, 02:29 PM
Replies: 30
Views: 2,908
Posted By feihu

RE: Tail waggin - design issues

Gyri:

I have a 36" span foam Kaos that was a tail wagger from the start. I increased the vertical fin area by adding a 1" strip to the LE and dorsal fin, but the waggin continued. Then I added a...
Forum: Scratch Building, Aircraft Design, 3D/CAD
04-21-2008, 02:41 PM
Replies: 7
Views: 8,056
Posted By feihu

RE: RCM Piper Twin Comanche - .049TD

Jetpack:
Looks like you have the potential of a fun twin with the Herr kit that you can modify.
Seems like you have a good handle on the mods to be made, so I would say - go for it!
I think I...
Forum: Scratch Building, Aircraft Design, 3D/CAD
04-20-2008, 07:45 PM
Replies: 7
Views: 8,056
Posted By feihu

RE: RCM Piper Twin Comanche - .049TD

Jetpack:

Last I heard, the idle speed was 3000rpm, not 300 as I had posted earlier. What idle speed do you get w/ 6x4 or 6x4 props?

Don't know the Herr Beechcraft or its structure. The...
Forum: Scratch Building, Aircraft Design, 3D/CAD
04-20-2008, 04:04 PM
Replies: 7
Views: 8,056
Posted By feihu

RE: RCM Piper Twin Comanche - .049TD

Jetpack:

I would not build any TD.049 twin unless there is throttle control.

Built a scale Aerocommander with twin TD.049s back in 1983 - still have my hand drawn plans.
The plane was...
Forum: Batteries & Chargers
04-18-2008, 11:48 PM
Replies: 21
Views: 2,749
Posted By feihu

RE: Wal Wart Voltage Question

Mike:

Here's some electrical help.

C is the capacity of a cell or battery pack. C for a 1600mah pack is 1600milliampere-hours which means that the pack is capable of delivering 1600...
Forum: Batteries & Chargers
04-18-2008, 04:20 PM
Replies: 21
Views: 2,749
Posted By feihu

RE: Wal Wart Voltage Question

nikg:

You have made some good observations.
It appears that your 9vWW did indeed fully charge the 8 cell pack .
Are you running the risk of damaging the WW? NO, because it is running cool,...
Forum: Scratch Building, Aircraft Design, 3D/CAD
04-17-2008, 04:50 PM
Replies: 30
Views: 2,908
Posted By feihu

RE: Tail waggin - design issues

Sounds like Dutch Roll to me.

feihu
Forum: Batteries & Chargers
04-17-2008, 04:31 PM
Replies: 1
Views: 419
Posted By feihu

RE: 1600mah ?

A 1600mah pack would last:
1600/1100 x 7 = 10.18 min (10min:10sec)

feihu
Forum: Electric General Discussion
04-09-2008, 05:28 PM
Replies: 3
Views: 1,144
Posted By feihu

RE: Upgrade from Brushed to Brushless motor

Are you flying with 7 cells - if so, suggest you go to 8 cells. You should use an ammeter to make sure you do not overamp the esc.
If you could tell me what the present power system is (prop size...
Forum: Tips & Techniques
04-06-2008, 10:52 PM
Replies: 13
Views: 1,924
Posted By feihu

RE: Landing a cap232

Matt:

You should learn how to slow fly your airplane. How do you suppose Jets land?

Suggest you go to altitude and set your powerhouse motor at about 1/3 throttle and pitch trim the...
Forum: Aerodynamics
04-06-2008, 05:12 PM
Replies: 4
Views: 3,146
Posted By feihu

RE: Spin recovery versus CG location?

If you move the CG aft far enough, the airplane will become unstable and uncontrollable in pitch, and therefore unrecoverable from a spin. But most conventional airplanes with conventional CG...
Forum: Batteries & Chargers
03-25-2008, 03:38 PM
Replies: 7
Views: 1,137
Posted By feihu

RE: Charging a 3600 nimh pack @ 300ma?

Hordsak:

Trickle charge can mean different things to different people, but one thing that is accepted by many ( including manufacturers) is charging at one tenth C where C is the capacity of the...
Forum: Aerodynamics
03-23-2008, 04:11 PM
Replies: 27
Views: 17,620
Posted By feihu

RE: clark Y, zero lift angle?

timothyb:

Here is a pic of the Tigermoth that I built years ago. Has a 4cycle 40 for power, wings are 11% Clark Y.
Both top and bottom wings have the flat bottom parallel to the horizontal...
Forum: Aerodynamics
03-22-2008, 09:44 PM
Replies: 27
Views: 17,620
Posted By feihu

RE: clark Y, zero lift angle?

Timothyb:
I'm not sure I understand your wing and tail incidence settings.
If the top wing is set at a HIGHER incidence angle than the bottom wing, then the top wing will stall first.
The net...
Forum: Airplanes - Full Scale
03-06-2008, 10:45 PM
Replies: 4
Views: 1,073
Posted By feihu

For you instrument pilots

Confucius Say:
Instrument takeoff is like TOOTHPASTE -
Easy to get out - BUT - velly difficult to get back in !
feihu
Forum: Electric General Discussion
03-05-2008, 09:43 PM
Replies: 10
Views: 1,007
Posted By feihu

RE: Slow down a Piper J-3 cub

Just fly it at reduced throttle!
feihu
Forum: Batteries & Chargers
03-05-2008, 08:35 PM
Replies: 4
Views: 662
Posted By feihu

RE: What could I buy/rigg up to charge multiple single sub c-cells?

Connect the individual cells temporarily with jumper cable clips in series to form a 6 or 7 1300mah pack and charge them accordingly. Then you can dissemble the pack.
feihu
Forum: Electric General Discussion
03-02-2008, 02:56 PM
Replies: 0
Views: 347
Posted By feihu

Any Sun City, AZ park flyers?

Hello:

Would like to connect with any parkflyer or group in Sun City, AZ for flying or just chatting.
You can contact me here, or email [email protected]

feihu
Forum: Batteries & Chargers
02-23-2008, 11:48 AM
Replies: 10
Views: 3,409
Posted By feihu

RE: how to make a homemade nicd glow driver charger?

Here's a photo of a couple of chargers that I built (with Radio Shack parts) a few years ago and I use them most every week. I charge only at C/10 rates for a single cell 4000mah as well as for 4-8...
Showing results 1 to 25 of 178
 
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