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All Forums >> RC Airplanes >> Pylon Universe - RC Pylon Racing >> Club 40 >> RE: Engines
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RE: Engines - 1/25/2008 3:39:24 PM   
AllTheGoodNamesAreTaken



Posts: 596
Joined: 8/31/2002
From: Oak Ridge, NC, USA
Status: offline
quote:

ORIGINAL: vicman

Here you go!
http://www.rcuniverse.com/forum/m_6966454/anchors_6966687/mpage_1/key_/anchor/tm.htm#6966687



Figures... I've got a Super Tigre .40 and a GMS .40. I'm not spending another $100 for a Thunder Tiger. You're entrance fee's are safe. Enjoy the competition.

_____________________________

Jeff Walker

(in reply to vicman)
       Post #: 26

RE: Engines - 1/25/2008 3:45:29 PM   
vicman



Posts: 6185
Joined: 12/8/2002
From: Valdese, NC, USA
Status: offline 		You don't need to spend $100. The TT.40 doesn't cost that much
What are you scared of? It's the same set-up as 424, you can use it on a Q-500 rig and steal some big bucks.

If you are such a fast man do you plan to come out to our speed rally this summer?


_____________________________

Bigger Badder Meaner Faster!
Revver Brotherhood & NMPRA #41

(in reply to AllTheGoodNamesAreTaken)
       Post #: 27

RE: Engines - 1/25/2008 4:01:02 PM   
AllTheGoodNamesAreTaken



Posts: 596
Joined: 8/31/2002
From: Oak Ridge, NC, USA
Status: offline
quote:

ORIGINAL: vicman

You don't need to spend $100. The TT.40 doesn't cost that much
What are you scared of? It's the same set-up as 424, you can use it on a Q-500 rig and steal some big bucks.

If you are such a fast man do you plan to come out to our speed rally this summer?



The TT .40 is $84.99 plus $8.99 shipping from Tower. OK so it's $93.98.

Scared? Who? Me? Are you kidding??? It's just that $$$ is getting tighter by the month. $100 for an airfame, sure, but another $93.98 for a .40 when I've got 4 different .40's already, no thanks.

Let me run my $50 GMS or Super Tigre .40 and I'm there. Either one will run better than that Thunder Tiger, for 1/2 the $$$

_____________________________

Jeff Walker

(in reply to vicman)
       Post #: 28

RE: Engines - 1/25/2008 5:44:23 PM   
skull1971



Posts: 765
Joined: 4/24/2006
From: Willis, TX, USA
Status: offline 		The ST GS40 was listed on Don's site as the optional engine, just the Texas group is going farther. As Don, and others have said, this is a "Start-up" class. So in an effort to (In the long run) save money, the TTPro40 is the recomended engine. Since it is AMA 424 legal, you would only have to change airframes to step up a class.

_____________________________

ERIC, Revver Bro. 159, NMPRA 59i, Knucklehead #1
Keeper of the South Texas SKULLY MAN!!

(in reply to AllTheGoodNamesAreTaken)
       Post #: 29

RE: Engines - 1/25/2008 6:44:26 PM   
DonStegall


 

Posts: 624
Joined: 8/8/2005
From: Monroe, NC, USA
Status: offline 		The RCPRO Club 40 rules page will likely change soon. The RCPRO Club 40 Committee is working on the engine question and issues. One thing that is not likely to change at all is that engines will remain limited to .40 in Club 40. This means that the OS 46LA and TT GP 42 are not acceptable for the Novice class.

We understand that there will be local deviations and/or additional restrictions. But we are getting a well defined spec together to provide guidance.

My personal testing of the SuperTigre GS-40 leads me to believe that it may be more tolerant of lean runs. However I do not feel that it is as user friendly as the Thunder Tiger Pro 40. It is harder to get a good idle and transition. It also does not turn up like the TT Pro 40. At least not until it is well broken-in.

The Florida group has switched to the GS-40 and the Texas group is using it for their Novice class. With an APC 11x4 prop, it makes a good entry level combination.

The ST GS-40 is being considered for AMA 424. A sample of engines was provided to the 424 engine committee. Even though it does not seem to keep up when limited to an APC 9x6 prop, I hope it is approved. Just so there is an option, and some competition for Thunder Tiger.

One thing is pretty well certain. The Thunder Tiger Pro 40 will remain the recommended engine for Club 40. While the Club 40 planes are fun, you can get 20-30 mph more out of the engine by putting it on a Quickie 500 and go race AMA 424 with it.


_____________________________

Don Stegall
RCPRO - http://www.rcpro.org - http://www.rcpylon.com

(in reply to skull1971)
       Post #: 30

RE: Engines - 1/27/2008 11:56:08 PM   
sahartman21


 

Posts: 29
Joined: 11/3/2007
From: Fritch, TX, USA
Status: offline 		I recently purchased a Sky Raider for flying in the Amarillo area races. In Texas several engines are allowed with the preferred choices being Thunder Tiger and the GMS.

The Thunder Tiger Pro 40 seems to be more available than the GMS 40 engine, which is also allowed. Several sources have been out of the GMS 40 for several months.

(in reply to DonStegall)
       Post #: 31

RE: Engines - 1/29/2008 3:25:31 AM   
RUNDUCK


 

Posts: 21
Joined: 4/7/2007
From: AMARILLO, TX, USA
Status: offline 		I'm one of the Amarillo racers and I flew a GMS 40 on my SKYRAIDER last year for our races. I think that the GMS 40 is a little tricky to tune correctly and another engine might be a better choice.

(in reply to sahartman21)
       Post #: 32

RE: Engines - 1/30/2008 2:18:08 AM   
DonStegall


 

Posts: 624
Joined: 8/8/2005
From: Monroe, NC, USA
Status: offline
quote:

ORIGINAL: AllTheGoodNamesAreTaken

Let me run my $50 GMS or Super Tigre .40 and I'm there. Either one will run better than that Thunder Tiger, for 1/2 the $$$


I'm going to have 4-6 Club 40 races (or at least race practice days) at my field this year. Bring on your ST GS-40 or GMS 40 and come play with us.

Both engines are allowed per the RCPRO Club 40 rules and the engine list was just updated based on work by the RCPRO Club 40 Committee. See Club 40 Rules

_____________________________

Don Stegall
RCPRO - http://www.rcpro.org - http://www.rcpylon.com

(in reply to AllTheGoodNamesAreTaken)
       Post #: 33

RE: Engines - 4/25/2008 12:25:31 PM   
speedster 1919



Posts: 1467
Joined: 12/17/2004
From: Martinsville, IN, USA
Status: offline 		Boys I need to clear something up for you. First the RCU specs on the TT GP42 are wrong and the GP42 is a big lie. The GP42 is less than .40. It is .39 something. The ACE site will clear that up for you. So disallowing the GP42 would be wrong. Just like the Super Tigre 45 is actualy a .46

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Hey Buddy -That was the most spectacular crash I've ever seen , That rolling cart wheel with parts slinging out was cool...

(in reply to DonStegall)
       Post #: 34

RE: Engines - 4/25/2008 4:42:45 PM   
dwbebens


 

Posts: 206
Joined: 4/25/2005
From: Dickson, TN, USA
Status: offline 		speedster 1919

Actually, the TT GP 42 IS a .42! The Tower, Ace, and other reseller sites are wrong. The official Thunder Tiger site

http://www.tiger.com.tw/product/9041.html

lists the displacement as a .421 . See the data below that I cut-and-pasted directly from their site:

Description GP-42
Item No 9041
Category Engine >>> Nitro Engine >>> 2-Stroke Aircraft GP Series
Update Data 2008-04-08

Displacement 6.90 c.c. / .421 cu.in.

Bore 21.5 mm / 0.846 in.

Stroke 19.0 mm / 0.748 in.

Practical R.P.M. 2,000 ~ 15,000 rpm

Output (BHP/RPM) 1.10 / 14,000

Weight (g/oz) 357.2 / 12.60

To absolutely clear up this issue, I went out and re-measured my TT GP 42. I had done this in the past in response to this same issue in a former forum post. bore = 0.845" and stroke = 0.749" - - within 0.001" in each case from the factory specs. As you can verify:

Pi*((0.845/2)^2)*0.749 = 0.420 cu. in.

It baffles me that all the re-sellers of this engine give the wrong bore, stroke, and displacement for this engine. It IS a .42. That's probably why it is almost as good as the TT Pro 40. In our Club 40 races here in Nashville, when a well flown TT GP 42 is flown against a well flown TT Pro 40, the finishing difference is only about 1/4 to 1/2 lap at the end of 10 laps. For local preference reasons, we allow the TT GP 42 in both Novice class and Advance class, that's why there were 42's in our advanced class.

Doug Bebensee

< Message edited by dwbebens -- 4/25/2008 4:50:36 PM >

(in reply to speedster 1919)
       Post #: 35

RE: Engines - 4/25/2008 6:44:40 PM   
skull1971



Posts: 765
Joined: 4/24/2006
From: Willis, TX, USA
Status: offline 		Well I have to say that after now running a TT pro 40, and it getting some time on it. It's a very impressive engine for the price. I thought I'd be cool and run OS FX's, because they are rated as having more power, WRONG!, I wasted time and money, just to go with the TT Pro 40.

If I'd have listened to the "Grown-ups"

Oh well, I'll make you a deal on a OS FX 40

_____________________________

ERIC, Revver Bro. 159, NMPRA 59i, Knucklehead #1
Keeper of the South Texas SKULLY MAN!!

(in reply to dwbebens)
       Post #: 36

RE: Engines - 4/25/2008 11:47:00 PM   
Jezmo



Posts: 821
Joined: 6/26/2006
From: Spring, TX, USA
Status: offline 		Just to add my two cents if the engines are limited to just TT40 Pro's and the prop is limited to just 9X6, count me out. I will run dead last with some engine other than what everyone else is running. Don't know why but it's the way I've always been and probably always will be. Call me a non-conformist if you will but it is what it is. I just like to be different.

I didn't win a single race last year and probably won't this year either but I had a heck of a good time and that's why I'm there. Take away my ability to be different and you take away my own personal idea of fun. Again, just my two cents, not to be taken personal.

_____________________________

Raptor 50 V2 OS 50 Hyper, T-Rex 450XL CDE, Spektrum DX7, SuperTigre OS FOX Saito Enya Jett TT

(in reply to skull1971)
       Post #: 37

RE: Engines - 4/26/2008 12:24:15 AM   
gunfighter


 

Posts: 629
Joined: 7/13/2002
From: Canyon Lake, TX, USA
Status: offline 		JEZMO - You must be thinking of AMA 424. That is an AMA rule book class and is normally limited to the TT Pro 40 and 9x6 APC prop.

Club 40 (in TEXAS) is not limited to any engine. We can fly ANY sport 40 engine (or less) with a retail price of $120.00 or less. ANY prop is allowed.

There is a group flying club 40 in the Carolina's that also limits the engine / prop the same as 424. However, the RCPRO club 40 rules use the same engine / prop rules as we do in Texas.

We have competitors flying several engines including TT, ST, GMS and OS. We have had Rossi's, Norvel's etc. "give it a try" but they could not keep up IF TUNED TO STAND AT IDLE FOR UP TO ONE MINUTE.

Next race is next Sat. May 3rd at the Old Kingsbury Aero drome in Kingsbury TX. I-10 exit 620 (10 miles east of Seguin). North 1.8 miles. Registration till 9:30 and race at 10:00.

Hope to see you there!

< Message edited by gunfighter -- 4/27/2008 1:15:25 AM >

(in reply to Jezmo)
       Post #: 38

RE: Engines - 4/26/2008 12:55:19 AM   
Jezmo



Posts: 821
Joined: 6/26/2006
From: Spring, TX, USA
Status: offline 		Yes, the groups outside of Texas are moving towards or are already there, having the TT Pro rule with a 9X6 prop like the 424's. My comment wasn't directed so much at the Texas group as it was to let the national group know my feelings and if Texas ever considers such a rule change they already know where I stand. I hear (and read) discussions about wanting to get more people involved in club 40 and this type of thinking turns some folks off. Would you be interested in watching an artist paint if all he had was one color? I spent thousands each year for the last 30 yrs. going to and watching Nascar cup races. Now that they are turning them into spec racers I no longer go. The color has faded for me.

Have a fine one Chuck and yes I'm still running that same ole broken down junk ST 40 that I had in Austin last year.

< Message edited by Jezmo -- 4/26/2008 12:56:39 AM >

_____________________________

Raptor 50 V2 OS 50 Hyper, T-Rex 450XL CDE, Spektrum DX7, SuperTigre OS FOX Saito Enya Jett TT

(in reply to gunfighter)
       Post #: 39

RE: Engines - 4/26/2008 1:12:54 AM   
Fxrs_tim


 

Posts: 301
Joined: 4/4/2005
From: Austin, TX, USA
Status: offline
quote:

ORIGINAL: gunfighter

Next race is next Sat. Nov. 33rd at the Old Kingsbury Aero drome in Kingsbury TX. I-10 exit 620 (10 miles east of Seguin). North 1.8 miles. Registration till 9:30 and race at 10:00.




Chuck,

You must have been out in the sun too long at the warbird event today!! I just checked my calendars for the past 15 years and haven't been able to find a November 33rd......

For the rest of y'all - we'll be racing on *MAY 3RD* in Kingsbury!

Tim

(in reply to gunfighter)