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Thunder Tiger .71 four stroke - 3/22/2008 9:43:19 PM   
Billy Buckner


 

Posts: 18
Joined: 6/24/2004
From: Ponte Vedra Beach, FL, USA
Status: offline 		I am considering buying the new Thunder Tiger .71 four stroke engine and would appreciate any recent first hand experience with this engine. Quality, break in, power, props, oil content, use of synthetic fuel, nitri %, etc. Many thanks.
       Post #: 1

RE: Thunder Tiger .71 four stroke - 3/22/2008 10:09:04 PM   
asmund


 

Posts: 1826
Joined: 11/20/2005
From: Floroe, NORWAY
Status: offline 		Do you really mean the 75 or maybe the 91???

(in reply to Billy Buckner)
       Post #: 2

RE: Thunder Tiger .71 four stroke - 3/23/2008 12:11:16 AM   
Billy Buckner


 

Posts: 18
Joined: 6/24/2004
From: Ponte Vedra Beach, FL, USA
Status: offline 		Typo - I meant .75 Thanks,

(in reply to asmund)
       Post #: 3

RE: Thunder Tiger .71 four stroke - 3/23/2008 3:24:26 AM   
Ed_Moorman



Posts: 3647
Joined: 1/5/2002
From: Shalimar, FL, USA
Status: offline 		I have a new Thunder Tiger .75 and have run it about 6 times on the bench on a small tank that is probably about 6 ozs. Most of the runs were on the 11-8 prop specified for break-in by the instructions. For the last 2 tanks, I went to a 13-6 APC. I was turning 10,000 rpm. I expect this to increase as it will probably take a gallon or so for the engine to really come in.

I would run it more on the bench except my buddy was building a Neptune ARF seaplane that we planned to use the .75 in and he got ahead of my break-in and wanted the engine, so it is now in the plane. I'll have to do the rest of the break-in in the air.

So far it has been an easy-to-run engine. My starter battery dropped dead and I had no trouble hand starting it. It adjusted easily and didn't ever kick back or kick the prop off.

I also have an older Saito .72 and a Magnum .70, as well as a fairly new OS .70 the the Tiger. They all seem to be in the same ball park. The Tiger is shorter than any of them,m so it will be easier to cowl in.



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_____________________________

Ed Moorman, AMA 553, KD4QBM, Revver Bro #156
R/C Report Magazine, Fun Aerobatics Column

(in reply to Billy Buckner)
       Post #: 4

RE: Thunder Tiger .71 four stroke - 3/23/2008 9:27:59 AM   
asmund


 

Posts: 1826
Joined: 11/20/2005
From: Floroe, NORWAY
Status: offline 		And, oh so beautiful

(in reply to Ed_Moorman)
       Post #: 5

RE: Thunder Tiger .71 four stroke - 3/23/2008 12:52:54 PM   
Billy Buckner


 

Posts: 18
Joined: 6/24/2004
From: Ponte Vedra Beach, FL, USA
Status: offline 		Ed, many thanks for your input. I enjoy your column in RC Report, BVB

(in reply to Ed_Moorman)
       Post #: 6

RE: Thunder Tiger .71 four stroke - 3/29/2008 11:53:14 AM   
Billy Buckner


 

Posts: 18
Joined: 6/24/2004
From: Ponte Vedra Beach, FL, USA
Status: offline

































Ed, I'd like to know whether or not you used castor oil during break in. I like Wild Cat fuel which as you know is totally synthetic
but could ad some Klotz degummed castor. What do you think? BVB















ed

(in reply to Ed_Moorman)
       Post #: 7

RE: Thunder Tiger .71 four stroke - 3/29/2008 3:05:45 PM   
SRimer


 

Posts: 29
Joined: 9/3/2006
From: Skokie, IL, USA
Status: offline 		I have one, the first one one i had, had a bad conecting rod from the very first drop of fuel, Ace Hobby unhappy replace it for me.
I'm using APC 13*6 and wild cat 10%, it appears that the engine would prefer more nitro (the rpm drop when i pull the igniter) i'll try Cool 15% next,
I never tached it, but it pulls my Arco 50 (6lb) with no problems at all, nice 3D, I tried also 14*4w it spins it no problem, but i prefer the 13*6 it spools much faster.

(in reply to Billy Buckner)
       Post #: 8

RE: Thunder Tiger .71 four stroke - 3/29/2008 6:08:27 PM   
Ed_Moorman



Posts: 3647
Joined: 1/5/2002
From: Shalimar, FL, USA
Status: offline 		Billy,

Call me old fashioned, but I use a castor blend fuel, Morgan's Omega 10% for about everything. I have never bothered with an after engine run oil and never had any problems. If I am going to store an engine flr a long while, I will put some oil in it.

It used to say on the Morgan web site, but has been removed, that Omega was for ABC engines and Cool Power was for ringed engines. I started running Omega and never changed.

_____________________________

Ed Moorman, AMA 553, KD4QBM, Revver Bro #156
R/C Report Magazine, Fun Aerobatics Column

(in reply to SRimer)
       Post #: 9

RE: Thunder Tiger .71 four stroke - 3/29/2008 6:41:14 PM   
jeffk464


 

Posts: 1239
Joined: 10/31/2004
From: cerritos, CA, USA
Status: offline 		Hobby People has the magnum .91 four stroke on sale for $149 if you move quick.

(in reply to Ed_Moorman)
       Post #: 10

RE: Thunder Tiger .71 four stroke - 3/29/2008 6:42:38 PM   
buzzard bait


 

Posts: 982
Joined: 1/1/2003
From: Ithaca, NY, USA
Status: offline 		Ed, which way is it shorter, front to back or top to bottom? Thanks,
Jim

(in reply to Ed_Moorman)
       Post #: 11

RE: Thunder Tiger .71 four stroke - 3/29/2008 6:58:12 PM   
estradajae


 

Posts: 146
Joined: 11/10/2005
From: MedellinAntioquia, COLOMBIA
Status: offline 		Ed, does this Engine (thunder tiger 75s) weights really about 16oz as claimed in some website? it means it will be in the same weight range as a 46 engine (o.s or magnum)!!!

I have seen it for 170USD... I would like to be able to buy this engine in the near future...looks really nice and seems compact and so much lighter than current 70 4strokers.

Jorge

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       Post #: 12

RE: Thunder Tiger .71 four stroke - 3/29/2008 10:15:30 PM   
Ed Cregger



Posts: 7484
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline
quote:

ORIGINAL: Ed_Moorman

Billy,

Call me old fashioned, but I use a castor blend fuel, Morgan's Omega 10% for about everything. I have never bothered with an after engine run oil and never had any problems. If I am going to store an engine flr a long while, I will put some oil in it.

It used to say on the Morgan web site, but has been removed, that Omega was for ABC engines and Cool Power was for ringed engines. I started running Omega and never changed.



------------------


I ran all synthetic Cool Power years ago, mainly because I hated cleaning up castor oil and the varnish stains it created.

Age (mileage?) changes one's perspective a bit. I now agree with you. My fuel has to have at least 2 or 3% castor in it now. Why take a chance? Besides, that little bit of castor oil isn't going to make a noticable difference in clean-up anyway.

I'm getting the itch to buy one of the new TT four-strokes. I'll probably opt for the .91 when I decide to take the leap. Asmund is right, they sure are pretty, and they don't cost $350.


Ed Cregger



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Artisan

"Flying models since the Fifties - I'll get the hang of this yet!!!"

(in reply to Ed_Moorman)
       Post #: 13

RE: Thunder Tiger .71 four stroke - 3/29/2008 10:49:02 PM   
Ed_Moorman



Posts: 3647
Joined: 1/5/2002
From: Shalimar, FL, USA
Status: offline 		My TT .75 weighed 18.2 ounces or 518 grams. That's the same as an OS .55AX.

I just checked my Saito .72. Exact same weight, 512 grams.

As for height vs. length, it is definitely longer, but it is shorter than the OS .70 and Saito .72 I own. I measure from the bottom of the engine mounting lugs to the top of the rocker cover. The TT is 1/4" shorter than the Saito, 3 3/8" vs. 3 5/8".

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< Message edited by Ed_Moorman -- 3/29/2008 11:03:28 PM >

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Ed Moorman, AMA 553, KD4QBM, Revver Bro #156
R/C Report Magazine, Fun Aerobatics Column

(in reply to Ed Cregger)
       Post #: 14

RE: Thunder Tiger .71 four stroke - 3/29/2008 11:25:38 PM   
buzzard bait


 

Posts: 982
Joined: 1/1/2003
From: Ithaca, NY, USA
Status: offline 		Thanks for those figures, Ed. Seems like a good buy.

A quarter inch can make a difference in some scale applications

Jim

(in reply to Ed_Moorman)
       Post #: 15

RE: Thunder Tiger .71 four stroke - 3/30/2008 2:32:08 AM   
estradajae


 

Posts: 146
Joined: 11/10/2005
From: MedellinAntioquia, COLOMBIA
Status: offline 		Thank you Ed

SOunds very interesting.....I think I'll buy it when I earn some cash few months ahead jeje!...


I just got to have one 4stroker....!!!

Jorge

_____________________________

Airplanes, engines and flying become an addiction...with not enough wallet

(in reply to Ed_Moorman)