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Search: Posts Made By: alfa156
Showing results 1 to 25 of 148
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Forum: Aerodynamics
08-11-2013, 05:49 PM
Replies: 29
Views: 4,254
Posted By alfa156

Power = Drag x Velocity Drag = Weight / (Lift...

Power = Drag x Velocity
Drag = Weight / (Lift Drag Ratio)

So if your aircraft size is doubled (wing span double = 4 times the original wing area), the weight could be 4 times the original...
Forum: Everything Diesel
05-09-2012, 12:20 AM
Replies: 33
Views: 9,639
Posted By alfa156

RE: New Enya 4-stroke diesel?

Wonder if anyone had taken the plunge and ordered one?
Kinda strange to see a glow plug on a 'diesel'. :D
Forum: Brushed/Brushless motors, speed controls, gear drives
04-10-2006, 09:24 AM
Replies: 2
Views: 648
Posted By alfa156

Electric prop or gas prop

Hello

I have this AXI 5320 motor.
I was planning to run it with APC 19x10E.

But I actually have a 19x10 carbon prop meant for gas engines.
Wonder what are the obvious...
Forum: Gas Engines
02-24-2006, 06:13 AM
Replies: 90
Views: 12,807
Posted By alfa156

RE: RCS 45cc 4-Stroke Engine?

Is the gas version ready for sale already?
Looks great on the photos!
Forum: Digital Video (DV) & Video Editing Software
01-27-2006, 01:02 AM
Replies: 4
Views: 1,417
Posted By alfa156

RE: Putafile Question

Try this
http://www.yousendit.com/
Forum: Aerodynamics
01-13-2006, 01:11 AM
Replies: 28
Views: 6,835
Posted By alfa156

RE: Deep Stall Recovery

This clip shows an aircraft in steep descent (not deep stall).

http://s8.yousendit.com/d.aspx?id=2D322T9B5GZA72BGIZR9PPMWH3
Forum: Aerodynamics
01-13-2006, 12:54 AM
Replies: 28
Views: 6,835
Posted By alfa156

RE: Deep Stall Recovery

Thanks for pointing out the difference between deep stall (non recoverable) and stall landing.
BTW, would stall or deep stall have any difference during landing? More reliable? etc?

Thanks!
Forum: Aerodynamics
01-12-2006, 10:11 AM
Replies: 28
Views: 6,835
Posted By alfa156

RE: Deep Stall Recovery

Thanks to all, esp Bax.

I built my glider with high wing dihedral + high stabiliser .... using salvaged parts from my other birds.
Bingo! Got it to deep stall and land.

However, my bird...
Forum: Gas Engines
12-06-2005, 08:28 PM
Replies: 5
Views: 1,296
Posted By alfa156

RE: Fuji 4 Stroke 34cc

Just went through the Fuji manual again.
They suggested using a low octane fuel (without alcohol).
No specific octane numbers were mentioned

Also suggested that some gasoline has ethanol...
Forum: Gas Engines
12-06-2005, 06:47 PM
Replies: 5
Views: 1,296
Posted By alfa156

RE: Fuji 4 Stroke 34cc

Thanks.
Yes, now I know the different between RON and PON.

Also, looks like I got to work on the low needle a bit more.
It is unfortunate that the mixture needles are facing the prop. I...
Forum: Gas Engines
12-06-2005, 11:12 AM
Replies: 5
Views: 1,296
Posted By alfa156

RE: Fuji 4 Stroke 34cc

Well, I don't think this Fuji is a high compression engine though.
I did not quite hear the pinging with 92 octane. Maybe I am getting old.
Will ask my fellow flyers to hear it over the weekend....
Forum: Gas Engines
12-06-2005, 08:49 AM
Replies: 5
Views: 1,296
Posted By alfa156

Fuji 4 Stroke 34cc

Hello

Just tested a Fuji 4 stroke 34cc.
http://www2.gpmd.com/image/f/fjig0234.jpg

I installed a velocity stack, cos I noticed the max throttle was unstable.

After running in with 92...
Forum: Aerial Photography and Video
11-01-2005, 10:00 AM
Replies: 5
Views: 1,162
Posted By alfa156

RE: Where to buy 3 gram camera?

Yep. It is one mega impressive bird!
The miniature electronics are very impressive.
[8D][8D][8D]
Forum: Aerial Photography and Video
10-30-2005, 10:35 AM
Replies: 5
Views: 1,162
Posted By alfa156

Where to buy 3 gram camera?

Saw a couple of micro UAV ... Black Widow and Wasp.
Seems very feature packed! (GPS etc).

Wonder what kind of cameras are they using?
Apparently they weigh 2-3grams each....not sure if that...
Forum: Tachometer Readings
09-30-2005, 08:01 AM
Replies: 16
Views: 5,476
Posted By alfa156

RE: Saito 72

Saito 72 with 14x6 @ 9000rpm.
Forum: Aerodynamics
09-19-2005, 06:21 PM
Replies: 32
Views: 3,088
Posted By alfa156

RE: New way to control roll?

The motors might add more roll inertia. So roll response will be tardy?
Forum: Aerodynamics
09-19-2005, 09:58 AM
Replies: 28
Views: 6,835
Posted By alfa156

Deep Stall Recovery

Came back from flying field over the weekend.
Saw a glider dropping straight down vertically with little forward speed.
Apparently that was a deep stall landing.
It was used as the landing area...
Forum: Composites Fabrication And Repair
09-17-2005, 11:14 AM
Replies: 3
Views: 831
Posted By alfa156

RE: Carbon Fiber Spar

Hello Barry

Thanks for the link.
:)
Forum: Composites Fabrication And Repair
09-12-2005, 11:44 AM
Replies: 3
Views: 831
Posted By alfa156

Carbon Fiber Spar

Hello

Looking for ready made carbon fiber spar .... apprx >1/2" tall, 1/8" thick..... 3ft or so length.
Wonder if there are ready made ones out there?
Forum: Giant Scale Aircraft - 3D & Aerobatic
07-01-2005, 12:22 AM
Replies: 3
Views: 497
Posted By alfa156

Any 18 x 18 carbon prop?

Are there any 18 x 18 carbon props?
Menz? Mejzlik? Bolly? etc

Thanks.
Forum: Giant Scale Aircraft - 3D & Aerobatic
06-29-2005, 10:45 AM
Replies: 1
Views: 332
Posted By alfa156

Servo for ?? pound bird

Hello

Wonder if they are any guides for servo sizing?
Example 30lb, 40lbs 3D flyer ...... what would be the recommended servo?
Forum: Gas Engines
06-22-2005, 11:04 AM
Replies: 3
Views: 1,011
Posted By alfa156

3W 24i /QS

Does anyone else have this engine?
I hope to setup the engine to run 18 x 8.
Does anyone know what is the expected RPM?

Which are the other similiar engines?
btw, I used to run a Saito 150...
Forum: Gas Engines
06-12-2005, 11:47 AM
Replies: 7
Views: 900
Posted By alfa156

Prop Bolt Failure

Hello guys

I had this 3W 75i for the past year or so on my plane.
The engine is great so far. Powerful and easy to start.
Engine is in very good condition. Never crashed, although I had a...
Forum: Gas Engines
05-27-2005, 12:09 PM
Replies: 14
Views: 1,064
Posted By alfa156

RE: Engines suitable for High Altitude?

Wow, my post attracted 10 replies overnight.
:eek:

One of my mates in the flying field is doing a course in the local university's Aerospace Engineering.
http://www.ntu.edu.sg/mae/

In...
Forum: Gas Engines
05-26-2005, 06:44 AM
Replies: 14
Views: 1,064
Posted By alfa156

Engines suitable for High Altitude?

Hello

Wonder if there are any engines with approx ~10hp that can operate in high altitude?
Say maybe up to 20,000ft?

Any suitable turbocharged/supercharged RC engines? Turboprops?
Showing results 1 to 25 of 148
 
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