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Magnum XLA 36/Thunder Tiger 36 Questions

Stuka Stunt Main Forum · 19 of 19 known posts recovered

Larry · Nov 17, 2004 08:07 AM

#0 source
From what is posted here on SSW, I assume that the Magnum 36 and the Thunder Tiger 36 are two light, high quality, and affordable PA engine possibilities. I also infer that they run fine in stock form (other than the bearing issue of the Magnum) in a wet two-cycle mode. My questions involve venturi size od and mounting holes.

From what I have read I believe that the TT 36 fits the mounts of a Fox 35 that uses a half inch front extension. What mounts would a Magnum 36 "drop-in" to?

I have many FP/LA venturis. Do these venturi fit the case of Magnum? Same question for the TT 36. Thanks. Larry Lindburg

Bill Little · Nov 17, 2004 08:17 AM

#1 source
Hi Larry,
As to the Magnum 36 XL IIS (square head), it needs a .250-.260 venturi. The venturi from an OS 32F fits perfectly with a PA or ST NVA in the carb hold down holes, so the LA/FP will be too small in outside diameter for the case. Haven't experienced the bearing problem in ours.

I also have used the old round head Magnum 36, which seems to run just as well, but it is heavier and doesn't fit the same bolt holes.

I have a TT 36 and an Aero Tiger 36, but can't tell ya what size the venturi's are. I never measured them! LOL!!

TT and Magnum sq. head, OS 32F all fit in basically the same mounting holes with only NVA position and slight differences in shaft lengths.
Bill <><


When the character of a man is not clear to you, look at his friends.
Japanese Proverb

Larry · Nov 17, 2004 08:28 AM

#2 source
Thanks for the reply, Bill. The OS 32F is a little uncommon here in Illinois. Where does one get a controline venturi for the 32F? Thanks, again. Larry

Circle Burner · Nov 17, 2004 08:38 AM

#3 source
Yo Bill,
I just bought an Aero Tiger 36, the venturi is small I will have to measure it. What a nice engine, can't wait to run it. I watched John Simpson flying his Cavalier at Huntersville with the Aero Tiger and I thought it was the best engine I had ever heard. Lots of power and a very smooth run.

SRiese5283 · Nov 22, 2004 01:30 AM

#17 source
>Thanks for the reply, Bill. The OS 32F is a little uncommon
>here in Illinois. Where does one get a controline venturi
>for the 32F? Thanks, again. Larry

I make them

Bill Little · Nov 22, 2004 06:08 AM

#18 source
Hi Scott,

I do appologise for not mentioning you for venturis. Goodness knows I have a bunch of venturis from you and they are all real nice pieces of workmanship and your service is excellent.

I have so much on my mind right now that it seems I van't think past the immediate moment sometimes.

To all: Scott really does excellent work, and he's very quick about it.

Thanks for what you do!
Bill <><

When the character of a man is not clear to you, look at his friends.
Japanese Proverb

peabody · Nov 17, 2004 08:40 AM

#4 source
Larry...
In STOCK form, the TT .36 isn't all that great for stunt use, while the Magnum seems to be nifty (Brett, Phil, etc. say so).


See Ya

Peabody

Circle Burner · Nov 17, 2004 08:52 AM

#5 source
Larry,

Randy Smith offers these engines on his website, your going to pay more but they are stunt ready. Randy does Top Notch work!

www.aeroproduct.net

Alan Hahn · Nov 17, 2004 03:17 PM

#8 source
Peabody,

I wonder why you think that is true. If you run the Thunder Tiger like you run the Magnum, I would think that it would perform similarly. I thought the Randy Smith rework (TT->AeroTiger)made it run more like a 4-2-4 run---but I could easily be mistaken on that.

My guess is that any modern schneurle style engine is suitable for stunt if you run it where it was designed to run (rpm wise).

peabody · Nov 18, 2004 05:17 PM

#14 source
Alan:
According to those that own tools and know this stuff, the TT is ported way too high stock....why, I imagine, that it makes such a great cl Profile Carrier powerplant, or a speed limited combat powerplant.

What I have received is that to make it similar in port timing to a Magnum, the sleeve must be dropped in the case.....and, if I understand it correctly, when dropped to the correct height, the crank hits the sleeve. Simply not the same as the Magnum.

They work great as three line motors.....lots of power and quality carbs..........

See Ya

Peabody

Bill Little · Nov 17, 2004 10:01 AM

#6 source
Larry,

The venturis I use usually come from Randy Smith, he seems to always have them in stock.

I am sure Leonard and others have them.

Believe me, the Magnum needs nothing but a venturi/NVA and 11-4 prop, with Sig 5%-10% Champion 1/2 and 1/2. Just don't expect it to run a 4-2 break.
It comes amazing close to a great "pipe" run on just a tongue muffler.
Bill <><

When the character of a man is not clear to you, look at his friends.
Japanese Proverb

Larry · Nov 17, 2004 02:24 PM

#7 source
Bill, This is great info for "stunt on a budget!" Thanks. Larry

dirtydan · Nov 17, 2004 03:44 PM

#9 source
Y'all know, don't you, that PTG's Diva article, wherein I assume he regales us with full details on the Magnum 36, has been done and in the offices of Model Aviation for months, right?

Somebody's sitting on it. It would really be annoying to find out that certain someone might also be a person with a certain amount of interest in CL Stunt, would it not?

Hey! Bob Hunt, if you're doing searches for your name in order to facilitate your lurking activities--I *know* you're out and about!--there, I plopped 'em down for your ease and accuracy in getting right to the issue (no pun) at hand.

Most of the CL Stunt articles are a surprise. Nice surprises, and thank you. But Phil's article is one we have been talking about for *years* now! Especially what with the successes I have seen with an engine Phil pioneered, a $70.00 unit which costs less than the pipe, for goodness sake...

Jump on it, my man. In advance, thanks.

Dan

godzilla · Nov 18, 2004 08:28 AM

#10 source

>Most of the CL Stunt articles are a surprise. Nice
>surprises, and thank you. But Phil's article is one we have
>been talking about for *years* now! Especially what with the
>successes I have seen with an engine Phil pioneered, a
>$70.00 unit which costs less than the pipe, for goodness
>sake...
>
>Jump on it, my man. In advance, thanks.
>
>Dan

I am agreeing with Dan.

Dick Fowler · Nov 18, 2004 08:38 AM

#11 source
Quote....I am agreeing with Dan.

The City Smasher

Wow... "I think this is The Big One Elizabeth!"

PTG · Nov 18, 2004 04:45 PM

#12 source
"I am agreeing with Dan."

AND SO IT HAS COME TO BE
On this day all are witness to a MIRACLE

My life work is complete
PTG 2004 AD

godzilla · Nov 18, 2004 05:08 PM

edited#13 source
>"I am agreeing with Dan."
>
>AND SO IT HAS COME TO BE
>On this day all are witness to a MIRACLE
>
>My life work is complete
>PTG 2004 AD

It takes a Bob Hunt to bring us together.

Seriously, PTG's Diva is way cool, it deserves immediate publication. I am sure Bob will get it in there somewhere.

Please do Bob, I need a reason to read my mandatory issues of MA.

PTG · Nov 18, 2004 09:27 PM

#15 source
>>"I am agreeing with Dan."
>>
>>AND SO IT HAS COME TO BE
>>On this day all are witness to a MIRACLE
>>
>>My life work is complete
>>PTG 2004 AD
>
>It takes a Bob Hunt to bring us together.
>
>Seriously, PTG's Diva is way cool, it deserves immediate
>publication. I am sure Bob will get it in there somewhere.
>
>Please do Bob, I need a reason to read my mandatory issues
>of MA.

Okay, when will it get to print? The answer is the same as it has been for the past 2 years. SOON....... Only this time it's really true, VERY SOON.

Ole' Bob is not at fault here, in fact the engine part was just completed and sent last month.

One final thing, a Dirt quote "Most of the CL Stunt articles are a surprise. Nice surprises, and thank you".... Look for a digital bonus from Mr. Hunt and Model Aviation, think you'll really like the new thing!

dirtydan · Nov 21, 2004 03:50 PM

#16 source
In an earlier post, it appears as if I spoke a bit soon, and with too little knowledge of current situation as it applies to PTG's Diva article, why it has not yet been published.

As predicted, Bob Hunt continues to lurk around, saw his name used in vain. The most immediate result was a good news/bad news deal wherein Bob attempted to strike up our annual gab-fest while I was not at home and so could not offer up suitably pointed retorts.

Note to self: Buy a new answering machine, one which allows caller only 30 seconds with which to leave concise message. Further note to self: Investigate possibility of obtaining upgraded tape cassette for new machine, one which does not emit smoke when playing caustic messages...

In between sighs of frustration, comments of "Give me a break, will ya," I learned the following: Diva article is up for publication, and it will be even better, more complete than originally planned.

PTG and I talked briefly about his article during 2004 NW Regionals. Seemed to me a done deal. However, perfectionist that he is, later some of the text was declared substandard in ill-defined ways. Back for a re-write.

In doing so, the part of article dedicated to Magnum 36XL was expanded, presumably to include new information and/or elaborate on the tune-up. By that time I am sure PTG had seen others using this engine, nothing like a wider and deeper data base to bring up flawed approaches. Where better to take pre-emptive action than in article dealing with the very model which brought this engine to the fore? And I did mention this perfectionist streak, right?

However, once the two parts of article were assembled...too long for space allotted. Or too long for those who monitor every single piece in "their" magazine, this group comprised of a mere 175,000 souls, Bob's challenge being to piss-off all of them equally.

So. As PTG says, article is coming soon. And the best part is that stuff deemed important to presentation *did not* hit floor around Hunt's desk or trash can in paring it down to some ill-defined template into which all such articles are supposed to fit.

Instead, some part of the Diva article will be published on Model Aviation web site, a practice which I believe has been used with success in the past.

So while this article has indeed been a long time in coming to us--remember a couple years ago when I predicted publication in June, 2004, and was righteously pooh-poohed as being a cynic?--it is forecast by all parties to have been worth the wait. Good enough.

Note to PTG: At Joshua's home last night and during a weird dinner party which involved adults and children repeatedly crossing between Joshua's house and the neighbor's house across the street, your name came up when Josh was tossing his youngest boy in the air with a non-standard twist or two thrown in. "I learned that from a friend of mine! He used to throw me in the air just like that!

Please do note the attribution: *Not*, "... one of my Dad's friends..." Happily, it has ever been thus.

You will, however, not being throwing Joshua into the air anytime soon. No offense, but that window of opportunity has closed rather firmly. On the other hand, my grand-urchin Hunter would probably be interested.

Dan