Search: Posts Made By: Jburry
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Forum: Beginners
11-03-2008, 04:28 PM
Replies: 44
Views: 3,210
Posted By Jburry

RE: Problem by getting fuel into carburetor(OS 46LA)

Have you ever started a glow engine before? If you haven't it can be quite frustrating.... Help from someone who has done this before can save alot of time and energy.
Also, what is the...
10-31-2008, 09:59 PM
Replies: 25
Views: 2,465
Posted By Jburry

RE: Dopler wave o scope use

In Mk1spitfire's post above, #13, there's a link to the spreadsheet file. The thread on that forum that links to the spreadsheet (link's at the upper left of the page) gives a complete explanation,...
10-30-2008, 02:54 PM
Replies: 25
Views: 2,465
Posted By Jburry

RE: Dopler wave o scope use

Fun it was, too.

Looks to me like a 4st doubles the number of octaves shown, likely from the every-second-revolution exhaust note. The display was more cluttered and busy than I'm used to with...
10-28-2008, 09:00 PM
Replies: 25
Views: 2,465
Posted By Jburry

RE: Dopler wave o scope use

Any chance you can email a sound file to me? I'd like to see....
10-28-2008, 10:20 AM
Replies: 25
Views: 2,465
Posted By Jburry

RE: Dopler wave o scope use

Hmmm... It's possible that there's alot of background noise hiding the plane's sound.... I've never had a problem, so no help here...

I centre the cursor in the line, both coming and going. ...
10-27-2008, 08:07 PM
Replies: 25
Views: 2,465
Posted By Jburry

RE: Dopler wave o scope use

Any plane that makes a constant noise can be dopplered. Electrics, glow, gas, 2st, 4st, even jets. The motor's noise is used almost like a clock pulse, giving a constant pitch noise that is shifted...
09-30-2008, 03:23 PM
Replies: 558
Views: 59,459
Posted By Jburry

RE: new design: Strega 45

No surer way to bring the rains than to finish a new plane, buy a motorbike or a new telescope...

Hope the maiden goes well, look, that's a beautiful plane you've got there. Your craftsmanship...
Forum: Beginners
09-30-2008, 09:21 AM
Replies: 50
Views: 6,951
Posted By Jburry

RE: what causes flutter?

I have a model that suffered flutter, the Dynaflite Fun Scale P51D 40 size in my avitar beside this post. It was on an early flight in its life, maybe it's 6th or so. The airframe was built by a...
Forum: Beginners
08-28-2008, 03:38 PM
Replies: 12
Views: 1,002
Posted By Jburry

RE: Difference between A3 and #8 plugs??

I've used 8's and a3's in my 46AX and noted no real difference in performance. The 8 seemed to last slightly longer. I run 15% omega, and the engine turns very fast (16-17K in the air), yet the 8's...
08-21-2008, 11:55 AM
Replies: 19
Views: 7,073
Posted By Jburry

RE: Engine Break in Stand. Don't need to buy one!

I usually hack a pair of mounting beams from a piece of hardwood, and jury rig a throttle linkage and a fuel tank. Most of my engines are second hand, and I like to know it's a goer before I build a...
Forum: Beginners
08-14-2008, 10:26 AM
Replies: 63
Views: 4,815
Posted By Jburry

RE: Draining fuel and running the engine until it quits

While I doubt that moisture contaminated fuel from the plane's tank back to the bottle is actually causing your trouble (I fly in one of the most humid environments in North America, return my unused...
Forum: Beginners
08-01-2008, 11:00 AM
Replies: 11
Views: 848
Posted By Jburry

RE: O.S L.A .46 Help

Many of us hand start them. So long as you can get thru compression, it's turning fast enough.

The key is in priming correctly.

First thing I'd ask is is fuel getting to the carb? It is...
Forum: Beginners
07-25-2008, 01:08 PM
Replies: 10
Views: 564
Posted By Jburry

RE: engine trouble

I chased a similar problem on a Norvel .061 setup I have.

First, you MUST get the low speed needle tuned. However, if there's too much play in the throttle linkage (a problem that plagues...
Forum: Beginners
07-25-2008, 12:08 PM
Replies: 44
Views: 2,998
Posted By Jburry

RE: OS 55AX

I'm flying a 11x6 on a baffle-less .46ax in my Mustang. 13K and change static, ready for flight (500 off peak) unloads to over 17K in the air! 60 flights or so so far, most WOT from start to finish...
07-21-2008, 12:40 PM
Replies: 16
Views: 1,315
Posted By Jburry

RE: 2.1 kilograms, powered by a O.S. .50

First one is closer.

Look at, read and understand the info on this link:

http://www.av8n.com/how/htm/airfoils.html

The lift force from an airfoil is about 80% from the low pressure...
07-21-2008, 12:18 PM
Replies: 8
Views: 789
Posted By Jburry

RE: How to mix in flaperons?

Slave the elevator to channel 6, flapperon. If you slave it to aileron, every turn you make will have ele mixed in. Slave to the flap channel.

It's not about what surface it's slaved to, but...
Forum: Beginners
07-21-2008, 10:54 AM
Replies: 23
Views: 1,440
Posted By Jburry

RE: After run oil

If you run the fuel outta your engines at the end of the day, after run oil is at best a bit of insurance. Nothing more. Running the excess methanol/nitro out is the key.

There is one thing...
Forum: Beginners
07-18-2008, 12:37 PM
Replies: 23
Views: 1,440
Posted By Jburry

RE: After run oil

The best thing to use is air tool oil. Marvel Mystery Air Tool Oil is very popular for this. Some mix with ATF. I just use a generic brand air tool oil, and I use it only when the plane is going...
Forum: Beginners
07-18-2008, 12:35 PM
Replies: 24
Views: 1,721
Posted By Jburry

RE: NEW Flyer what to do

I'd suggest, like the others, that a bit more cash might be in order. You really get what you pay for in this hobby, or more to the point you rarely get what you don't pay for....

There are...
07-18-2008, 12:28 PM
Replies: 3
Views: 425
Posted By Jburry

RE: Engine cut-out

A 6oz tank is pretty small for a .40. Probably limited to about 6 minutes WOT. How long into that second flight were you? It's very easy to fuel starve an engine once the tank is below about 1/3rd...
07-18-2008, 12:16 PM
Replies: 16
Views: 1,315
Posted By Jburry

RE: 2.1 kilograms, powered by a O.S. .50

Washout is actually most beneficial at low speeds, near stall. It's not a bad idea, but if you have a constant-chord wing (not tapered), then it already has washout built in without warp. The...
Forum: Beginners
07-18-2008, 08:48 AM
Replies: 35
Views: 2,597
Posted By Jburry

RE: Yet another question on aerobatic maneuvers: Snap roll

Unless you have enough elevator to cause the plane to not loop successfully anymore (with full ele, it should try to roll out of a loop, or do a polygonal loop (stall, catch, stall, catch) then...
07-18-2008, 07:55 AM
Replies: 1
Views: 760
Posted By Jburry

RE: painters touch

Can't speak for gasoline proof, but it does well with glow exhaust residue. It softens if soaked with straight methanol, or unburnt fuel, but is absolutely impervious (as far as I can tell, on 3...
07-18-2008, 07:51 AM
Replies: 16
Views: 1,315
Posted By Jburry

RE: 2.1 kilograms, powered by a O.S. .50

Washout describes a wing that is twisted such that the wingtips point slightly downward, 1 or 2 degrees, relative to the wing root. This increases aileron authority in a stall, and helps prevent tip...
Forum: Beginners
07-18-2008, 07:12 AM
Replies: 35
Views: 2,597
Posted By Jburry

RE: Yet another question on aerobatic maneuvers: Snap roll

You need more throw.

Set your rudder for all the throw you can get.

Gradually increase the elevator throw until you can get enough to snap. It's the elevator that causes the stall, and the...
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