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Search: Posts Made By: MJD
Showing results 1 to 25 of 35
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Forum: "1/2 A" & "1/8 A" airplanes
06-09-2015, 03:29 PM
Replies: 96
Views: 21,616
Posted By MJD

Funny, thinking alike are we? I was laying out 3...

Funny, thinking alike are we? I was laying out 3 and 2 ounce Hayes tanks the other day, considering a rear 2oz and forward 3oz in the Mini Contender I'm converting to .15 power. The 3oz drops...
Forum: "1/2 A" & "1/8 A" airplanes
06-08-2015, 05:59 PM
Replies: 96
Views: 21,616
Posted By MJD

The 26" Demon already exists, but it is more than...

The 26" Demon already exists, but it is more than enough airplane for a .15, it was a floater with the .21 case overweight OPS .15. I'd go to 23-24 for this,but needs a center bay fuselage deep...
Forum: "1/2 A" & "1/8 A" airplanes
06-08-2015, 04:00 PM
Replies: 96
Views: 21,616
Posted By MJD

They have nice thin blades, perfect for this type...

They have nice thin blades, perfect for this type of engine. I wonder if this thing has much more, or any more, moxie than a contemporary F2D engine. Whatever.. it has a pipe on it and it sounds...
Forum: "1/2 A" & "1/8 A" airplanes
06-08-2015, 03:50 PM
Replies: 96
Views: 21,616
Posted By MJD

They have nice thin blades, perfect for this type...

They have nice thin blades, perfect for this type of engine. I wonder if this thing has much more, or any more, moxie than a contemporary F2D engine. Whatever.. it has a pipe on it and it sounds...
Forum: "1/2 A" & "1/8 A" airplanes
06-08-2015, 12:48 PM
Replies: 96
Views: 21,616
Posted By MJD

Since that F2D guy is nearby in Toronto, should...

Since that F2D guy is nearby in Toronto, should be no problem snagging some FG combat props locally to try out. I need to place an online order with APC sometime, low on pylon props and whatnot, so I...
Forum: "1/2 A" & "1/8 A" airplanes
06-08-2015, 09:29 AM
Replies: 96
Views: 21,616
Posted By MJD

I did think of that prop, I was thinking it might...

I did think of that prop, I was thinking it might be too much blade area for a speed engine so haven't run it yet.
Forum: "1/2 A" & "1/8 A" airplanes
06-08-2015, 05:02 AM
Replies: 96
Views: 21,616
Posted By MJD

That's about what it read when I decided to kill...

That's about what it read when I decided to kill it. It wasn't completely at peak, you could hear it clean up and surge a little when I pulled the line.

Yep - a combat 6-4 GF prop would be a good...
Forum: "1/2 A" & "1/8 A" airplanes
06-07-2015, 06:58 PM
Replies: 96
Views: 21,616
Posted By MJD

Hmm.. pull plug heat on a pretty new Nelson HD...

Hmm.. pull plug heat on a pretty new Nelson HD and the rpm drops and it starts complaining about being rich - pull a head shim?
Forum: "1/2 A" & "1/8 A" airplanes
06-07-2015, 06:54 PM
Replies: 96
Views: 21,616
Posted By MJD

The Graupner speed 6x5.5. cut down is one...

The Graupner speed 6x5.5. cut down is one possibility. I have a 5" dia version I'll try on the stand. I used that prop for setting up the pipe on the OPS .15, worked out perfectly in the air on the...
Forum: "1/2 A" & "1/8 A" airplanes
06-06-2015, 05:15 AM
Replies: 96
Views: 21,616
Posted By MJD

Good question - based on the speed trainer write...

Good question - based on the speed trainer write up, somewhere around 5.5 x 5, 5.5 x 6 or so.



Propeller. The best speed was achieved with a Master Airscrew 7x5 S-2 G/F Nylon Gray Propeller...
Forum: "1/2 A" & "1/8 A" airplanes
06-05-2015, 09:49 PM
Replies: 96
Views: 21,616
Posted By MJD

The seal is tight so far. I opened the stinger to...

The seal is tight so far. I opened the stinger to 4.65mm from 4.2mm. This was recommended for the longer runs to reduce heat buildup a bit. Shortened a 6/32 pressure fitting, "tapped" a hole through...
Forum: "1/2 A" & "1/8 A" airplanes
06-05-2015, 04:35 PM
Replies: 96
Views: 21,616
Posted By MJD

Tonight I ran the MDS with a slightly older Profi...

Tonight I ran the MDS with a slightly older Profi F2A pipe with pressure tap, Hayes 3oz tank, CF bench prop. I expected to have to fiddle but it fired up immediately, needled easily - lots more...
Forum: "1/2 A" & "1/8 A" airplanes
01-30-2015, 06:35 AM
Replies: 96
Views: 21,616
Posted By MJD

Cool, might just do that!

Cool, might just do that!
Forum: "1/2 A" & "1/8 A" airplanes
01-29-2015, 09:57 AM
Replies: 96
Views: 21,616
Posted By MJD

Try a pressure washer: ...

Try a pressure washer:

https://www.youtube.com/watch?v=llhcATrmsBg

https://www.youtube.com/watch?v=bCsg5pQimWI
Forum: "1/2 A" & "1/8 A" airplanes
01-28-2015, 03:06 PM
Replies: 96
Views: 21,616
Posted By MJD

For a pipe dent, I'd go see a guy who fixes brass...

For a pipe dent, I'd go see a guy who fixes brass instruments for schools - they are great at getting inside small diameter soft metal tubes and making them look half decent again. Trumpet lead pipes...
Forum: "1/2 A" & "1/8 A" airplanes
01-27-2015, 09:43 PM
Replies: 96
Views: 21,616
Posted By MJD

Go all the way, make it a servo adjustable slide...

Go all the way, make it a servo adjustable slide valve. You could accomplish the same thing with an old used cornet silver soldered to an exhaust header, and a servo on each valve. Might want to add...
Forum: "1/2 A" & "1/8 A" airplanes
01-27-2015, 07:43 PM
Replies: 96
Views: 21,616
Posted By MJD

That will look good sticking out the side of cowl...

That will look good sticking out the side of cowl of a steampunk vintage racer type design. The thin streamline version of the Butter Knife.
Forum: "1/2 A" & "1/8 A" airplanes
01-27-2015, 11:59 AM
Replies: 96
Views: 21,616
Posted By MJD

As a trumpet player on the side (well, sitting or...

As a trumpet player on the side (well, sitting or standing usually), I have watched a few "how do they make that?" videos showing thin wall brass tubing being formed around tight corners with a core...
Forum: "1/2 A" & "1/8 A" airplanes
01-27-2015, 06:08 AM
Replies: 96
Views: 21,616
Posted By MJD

Ha ha, neat trick. I have used ice for bending...

Ha ha, neat trick. I have used ice for bending tubing around a form before, works great.
Forum: "1/2 A" & "1/8 A" airplanes
01-26-2015, 04:31 PM
Replies: 96
Views: 21,616
Posted By MJD

This looks hopeful: ...

This looks hopeful:

http://www.greathobbies.com/productinfo/?prod_id=TRX4030
http://www.greathobbies.com/productinfo/?prod_id=TRX3224


http://www.greathobbies.com/productinfo/?prod_id=TRX5230X
Forum: "1/2 A" & "1/8 A" airplanes
01-26-2015, 04:27 PM
Replies: 96
Views: 21,616
Posted By MJD

Well, that's good info, thanks. It turned freely...

Well, that's good info, thanks. It turned freely and seemed "good", but it either went dry, or... what I think may have happened is the big end picked up some fine aluminum swarf as it kissed the...
Forum: "1/2 A" & "1/8 A" airplanes
01-26-2015, 03:30 PM
Replies: 96
Views: 21,616
Posted By MJD

How much big end journal clearance is too much /...

How much big end journal clearance is too much / too little? The Conquest rod is oversize, bit these don't have to be super close fit, do they..? I thought .002-003" was ok but maybe that's for much...
Forum: "1/2 A" & "1/8 A" airplanes
01-25-2015, 01:33 PM
Replies: 96
Views: 21,616
Posted By MJD

Hi Raddaddy - I bet a lot of the readers here...

Hi Raddaddy - I bet a lot of the readers here wanted to know more about the history: I knew it was a situation like that, but no details. Really appreciate the info, plus the tip on the Traxxas...
Forum: "1/2 A" & "1/8 A" airplanes
01-25-2015, 08:15 AM
Replies: 96
Views: 21,616
Posted By MJD

That might be pitch speed, but there is no reason...

That might be pitch speed, but there is no reason to suspect the aircraft was actually going that speed, although they indicate that it could with sufficient power and low enough drag. Those rpm...
Forum: "1/2 A" & "1/8 A" airplanes
01-23-2015, 06:31 PM
Replies: 96
Views: 21,616
Posted By MJD

It sounded very eager to run today. I got a...

It sounded very eager to run today. I got a handle on the incipient binding on the big end - yes it is tight and needs some clearance, but the bug end bushing is actually a bit thicker than the...
Showing results 1 to 25 of 35
 
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