TT .28 issues ???

TT .28 issues ??? Gallery slideshow

slideshow

View related threads: (in this forum | in all forums)

Logged in as Guest

Users viewing this topic: none

Search This Thread

Printable Version

90 Dgree Muffler Adapters
Seller: RC Specialties
Details: $19.95 | 4/12/2013 | Classified Ad
We will rotate YOUR AD in this spot if you select "Forum Featured" when placing or editing your ad!

All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> TT .28 issues ???

Page: [1]

Login

Message

<< Older Topic Newer Topic >>

TT .28 issues ??? - 2/25/2009 10:17 PM

richg99

Posts: 604
Score: 105
Joined: 9/29/2007
Last Login: 1/30/2011
From: Houston, TX, USA
Status: offline

I'm new to glow engines, but I have had the help of an "old hand" in sorting this problem out. I flew my new TT .28 today on a SpadStik. She would start and run through transition easily enough, but any time she was tipped up, she'd die. My buddy made a number of adjustments and she seemed to be OK.

Of course, as soon as I had her up and flying...on a small rise in altitude, she died out again. I am going to re-route the fuel line so it stays more horizontal. Right now, the fuel line rises over the engine bulkhead and back down to the input fitting That rise is only about 3/4 of an inch. Could that be the issue? When she dies out, the fuel line is still FULL??? I noticed that she doesn't draw much in the way of fuel, as compared to my other engine. When I close off the intake port and hand crank the engine, the fuel doesn't rush forward, like it does on my other .46 engine.??

Additionally, my buddy noticed that we have oil coming out of the front bearings. Could this be a factor and what might I do about it? This engine has only been run a half dozen times on my bench, and now with two flights, it doesn't seem to be working very well. Any and all help appreciated. Thanks Rich

p.s. I also own a OS .46 AX which display s none of these issues.

_____________________________

richg99

Hide Signatures

Post #: 1

RE: TT .28 issues ??? - 2/25/2009 10:35 PM

w8ye

Posts: 36438
Score: 318
Joined: 12/11/2001
Last Login: 5/22/2013
From: Shelby, OH, USA
Status: offline

Try opening the HS needle valve a couple clicks

_____________________________

Attended the CutFinger Institute of DirtNap University for years but never did graduate....
Recipient, Mangledhand award August 2008
Club Saito Member #7
Original AMA #31261

Hide Signatures

(in reply to richg99)

Post #: 2

RE: TT .28 issues ??? - 2/25/2009 11:33 PM

richg99

Posts: 604
Score: 105
Joined: 9/29/2007
Last Login: 1/30/2011
From: Houston, TX, USA
Status: offline

We did a lot of adjusting of the needle and the "air bleeder setting??". It seems that the TT doesn't use a high and a low needle like the OS. Anyhow, that is what we thought while on the field today. That is the only way we got her to fly at all..... then...poof..she still stopped running on the first climb. I just now re-routed the fuel line.

Any chance that the leaking front bearing is stealing "draw" power from the engine??? thanks Rich

_____________________________

richg99

Hide Signatures

(in reply to w8ye)

Post #: 3

RE: TT .28 issues ??? - 2/26/2009 12:42 AM

jib

Posts: 505
Score: 100
Joined: 9/4/2008
Last Login: 12/30/2012
From: Covington, WA, USA
Status: offline

quote:

ORIGINAL: w8ye

Try opening the HS needle valve a couple clicks

The fuel line going up and down is a moot point. As long as it ends up about where it starts, and there are not holes in the line and it's not excessively long, a liquid is happy to flow up and down on it's way to the other end.

The air bleeder is not affecting the fuel while it goes from level to tilted. The air bleed is your low speed mixture. Make sure your "helper" understands air bleeds vesus low speed needles. They operate opposite of the Low Speed needles typical found on higher end engines. There is nothing wrong with them. My GP42 has one and it's a great running engine.

w8ye has your answer above.

Jack

< Message edited by jib -- 2/26/2009 12:44 AM >

Hide Signatures

(in reply to w8ye)

Post #: 4

RE: TT .28 issues ??? - 2/26/2009 1:27 AM

richg99

Posts: 604
Score: 105
Joined: 9/29/2007
Last Login: 1/30/2011
From: Houston, TX, USA
Status: offline

Yep, you fellows have the solution. I opened it a lot more than " a couple of clicks" but....I found a spot where she liked to run and didn't stall out when I lifted the plane. If the winds slow down a bit, I'll give her another flight tomorrow. Thanks for all of your help. Rich

_____________________________

richg99

Hide Signatures

(in reply to jib)

Post #: 5

RE: TT .28 issues ??? - 2/26/2009 4:02 PM

jaka

Posts: 7182
Score: 158
Joined: 12/11/2001
Last Login: 5/21/2013
From: Upplands Vasby, SWEDEN
Status: offline

Hi!
Use a Tettra "bubbleless"tank and notice the difference!

_____________________________

Jan Karlsson - Supplier MVVS Products

Hide Signatures

(in reply to richg99)

Post #: 6

RE: TT .28 issues ??? - 2/26/2009 7:33 PM

richg99

Posts: 604
Score: 105
Joined: 9/29/2007
Last Login: 1/30/2011
From: Houston, TX, USA
Status: offline

Well, just readjusting the HS needle did the trick. She flew today and flew well, considering my lack of skill and the wind gusts. I still have some landing gear issues due to our rough field, but the motor and plane did well.
thanks again for the help. Rich

_____________________________

richg99

Hide Signatures

(in reply to jaka)

Post #: 7

RE: TT .28 issues ??? - 3/1/2009 2:24 AM

FrancisPerson

Posts: 697
Score: 100
Joined: 12/14/2001
Last Login: 3/14/2011
From: Middletown, MD, USA
Status: offline

This is a great engine! I have one on a kick around plane; when you get the mixture and fuel lines corrected you will be happy with its performance.

Francis

Hide Signatures

(in reply to richg99)

Post #: 8

RE: TT .28 issues ??? - 3/1/2009 10:36 AM

NM2K

Posts: 11429
Score: 161
Joined: 1/31/2002
Last Login: 5/23/2013
From: Ringgold, GA, USA
Status: offline

Save me a trip to the TT4U site by telling me if this is a plain bearing or a ball bearing engine. My guess is plain bearing since the carb is equipped with an airbleed instead of a low speed needle.

Engines become better handlers as they accumulate running time. Fly the snot out of her, but keep that high speed mixture always rich of peak with the nose of the model pointed upwards by at least 45 degrees. Also try to run the smallest prop that the engine manufacturer recommends for your engine during break-in. It is good to keep the load of the prop low so that the engine will not overheat during the critical break-in period.

I'm glad you are flying again. Have fun and good luck.

Ed Cregger

_____________________________

"Practice makes prefect"

Hide Signatures

(in reply to FrancisPerson)

Post #: 9

RE: TT .28 issues ??? - 3/1/2009 11:05 AM

rcdude7

Posts: 2223
Score: 105
Joined: 4/12/2003
Last Login: 2/15/2012
From: Great Mills, MD, USA
Status: offline

Ed, It is a sleeve bearing engine, what makes this new design interesting is this engine has the carb cast as part of the case, along with a integral backplate mount, etc.

Here is a link

http://www.thundertiger4u.com/thunder-tiger-gp28-p-13278.html

< Message edited by rcdude7 -- 3/1/2009 4:59 PM >

Hide Signatures

(in reply to NM2K)

Post #: 10

RE: TT .28 issues ??? - 3/1/2009 4:00 PM

NM2K

Posts: 11429
Score: 161
Joined: 1/31/2002
Last Login: 5/23/2013
From: Ringgold, GA, USA
Status: offline

Incorporating integral carbs usually spells the coming end for a model engine manufacturer. I would not like to see that happen.

Folks have been making engines with separate carbs for many decades now. This desperate measure to relegate the engine to throw away status would have succeeded if it were not for one thing - the price.

Ed Cregger

_____________________________

"Practice makes prefect"

Hide Signatures

(in reply to rcdude7)

Post #: 11

RE: TT .28 issues ??? - 3/1/2009 7:46 PM

jeffie8696

Posts: 4428
Score: 120
Joined: 5/10/2007
Last Login: 5/15/2013
From: Muscatine, IA, USA
Status: offline

I have seen the carb and case get busted together. Perhaps it would be a little cheaper to replace them as a unit?

_____________________________

Club Saito # 677 , Team Boca Bearings and Star Collectibles Muscatine

Hide Signatures

(in reply to NM2K)

Post #: 12

RE: TT .28 issues ??? - 3/1/2009 9:05 PM

NM2K

Posts: 11429
Score: 161
Joined: 1/31/2002
Last Login: 5/23/2013
From: Ringgold, GA, USA
Status: offline

Does the TT .28 have a bushing in the crankcase?

Ed Cregger

_____________________________

"Practice makes prefect"

Hide Signatures

(in reply to jeffie8696)

Post #: 13

RE: TT .28 issues ??? - 3/1/2009 9:51 PM

DarZeelon

Posts: 8915
Score: 163
Joined: 4/9/2003
Last Login: 9/6/2011
From: Rosh-HaAyin, ISRAEL
Status: offline

quote:

ORIGINAL: richg99

I'm new to glow engines, but I have had the help of an "old hand" in sorting this problem out. I flew my new TT .28 today on a SpadStik. She would start and run through transition easily enough, but any time she was tipped up, she'd die. My buddy made a number of adjustments and she seemed to be OK.

Of course, as soon as I had her up and flying...on a small rise in altitude, she died out again. I am going to re-route the fuel line so it stays more horizontal. Right now, the fuel line rises over the engine bulkhead and back down to the input fitting That rise is only about 3/4 of an inch. Could that be the issue? When she dies out, the fuel line is still FULL??? I noticed that she doesn't draw much in the way of fuel, as compared to my other engine. When I close off the intake port and hand crank the engine, the fuel doesn't rush forward, like it does on my other .46 engine??

Additionally, my buddy noticed that we have oil coming out of the front bearings. Could this be a factor and what might I do about it? This engine has only been run a half dozen times on my bench, and now with two flights, it doesn't seem to be working very well. Any and all help appreciated.

Thanks,

Rich

P.s. I also own a OS.46AX, which exhibits none of these issues.

Rich,

I presume your engine is a Thunder Tiger .28GP.

There is also a Pro version, but it is only available for ground vehicles (there isn't an airplane version).

The GP does not have ball bearings, but it does have a bronze bushing in the crankcase, in which the crankshaft spins.

In such engines it is quite natural for oil to leak out the front, behind the prop driver... If no leak forms, the oil clearance for the crankshaft is insufficient.

Just ignore this issue, as it is not a problem.

If you open the throttle and have the needle open 2 turns, fuel will rush into the engine, as you choke the carburettor and the air-bleed hole and turn the crankshaft over.
This will also happen, in the same amount, if you plug the exhaust outlet and turn the crankshaft over...

This is probably safer, BTW...

A .46 engine, especially one with a two-needle carburettor, provides better suction...

The fuel-tank mounting should be vibration isolated with ¼" latex foam.

The tank should be as far forward as possible (without touching the firewall) and with its center-line must be at the same level as the center of the carburettor barrel.

The pickup clunk must be at least ¼" from the back of the tank and free to 'fall' to the top of the tank, when the model is inverted.

The pressure line must be open to the inside of the tank, with the other end connected to the muffler (make sure the nipple is open).

The entire fuel-line must free of pin-holes and as short and as straight as possible... The means no 'slack' to ease refueling.
The fuel system in its entirety, must be free from any debris, including the carburettor passages (debris/lint/hair in the carburettor's fuel jet, is one thing that can cause problems you are having).

The engine must be adjusted to run consistently at full-throttle, with the nose straight-up. If it sags, or leans out, it is set too lean!

The air-bleed idle mixture adjustment, must be done for best transition; from a steady idle to full power, in level-flight attitude.
Screw it in to richen, out to lean the low-end mixture.

There are not 'buts', no 'ifs' and no excuses... If you do just one of the above wrong, your engine will not run right; and one thing cannot 'compensate' for another.

And your engine has a gender... it is a neutral 'it', rather than a 'she', or a 'he'...
It has absolutely no mind of its own and the quality of its running, is totally dependent upon your installation and your adjustment skills...

If the engine quits on you, too far away, you can't blame that 'old hand'; only yourself.

So, you had better perfect them all, so your engine will run well; not lousy.

_____________________________

Dar Zeelon - ISRAEL - ddzeelon@gmail.com
MVVS - Jett - MS Composit - Rossi - Mejzlik

Hide Signatures

(in reply to NM2K)

Post #: 14

RE: TT .28 issues ??? - 3/1/2009 10:21 PM

richg99

Posts: 604
Score: 105
Joined: 9/29/2007
Last Login: 1/30/2011
From: Houston, TX, USA
Status: offline

Thanks, SHE is running just fine now with the help posted on the 2nd answer above. Yes, running her a couple of turns out was the answer that I needed. I will file your response for future reference, though. Thanks for the detailed help. regards, Rich
p.s. if boats are called "she"....(which they have been for centuries) I believe that they perform better. Mine certainly always have. Probably true for airplanes and engines, too. Ha ha RG

_____________________________

richg99

Hide Signatures

(in reply to DarZeelon)

Post #: 15

RE: TT .28 issues ??? - 3/1/2009 10:42 PM

DarZeelon

Posts: 8915
Score: 163
Joined: 4/9/2003
Last Login: 9/6/2011
From: Rosh-HaAyin, ISRAEL
Status: offline

quote:

ORIGINAL: richg99

Thanks, SHE is running just fine now with the help posted on the 2nd answer above. Yes, running her a couple of turns out was the answer that I needed. I will file your response for future reference, though. Thanks for the detailed help. regards, Rich

p.s. if boats are called "she"....(which they have been for centuries) I believe that they perform better. Mine certainly always have. Probably true for airplanes and engines, too. Ha ha RG

Rich,

I am glad you got your engine running well... As someone new to this, you can learn from what I had written.

As to ships and maybe planes being called 'she'... at least they can move under their own power (or sails) and go places...

Using 'she' for your plane's engine would be similar to calling you plane's left wing; 'Michael'...

_____________________________

Dar Zeelon - ISRAEL - ddzeelon@gmail.com
MVVS - Jett - MS Composit - Rossi - Mejzlik

Hide Signatures

(in reply to richg99)

Post #: 16

RE: TT .28 issues ??? - 3/2/2009 12:27 AM

richg99

Posts: 604
Score: 105
Joined: 9/29/2007
Last Login: 1/30/2011
From: Houston, TX, USA
Status: offline

OK I'll concede that naming an engine is a stretch....but boats and planes need names. How else can I cuss them out when they don't behave my erratic commands? Ha ha regards, Rich

_____________________________

richg99

Hide Signatures

(in reply to DarZeelon)

Post #: 17

RE: TT .28 issues ??? - 3/2/2009 1:04 AM

jeffie8696

Posts: 4428
Score: 120
Joined: 5/10/2007
Last Login: 5/15/2013
From: Muscatine, IA, USA
Status: offline

Engines breath, therefore they live.

_____________________________

Club Saito # 677 , Team Boca Bearings and Star Collectibles Muscatine

Hide Signatures

(in reply to richg99)

Post #: 18

RE: TT .28 issues ??? - 3/2/2009 4:07 PM

NM2K

Posts: 11429
Score: 161
Joined: 1/31/2002
Last Login: 5/23/2013
From: Ringgold, GA, USA
Status: offline

You're lucky for resembling Ernest Borgnine. I resemble the baby buzzard in the Warner Bros. cartoons. "I'm lookin' for a baby bumblebee..."

Hmm. That might make a great avatar for me.

Ed Cregger

_____________________________

"Practice makes prefect"

Hide Signatures

(in reply to jeffie8696)

Post #: 19

Page: [1]

All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> TT .28 issues ???
Page: [1]

Jump to:

Google

Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP! : : FORUM RULES

RC Universe is a service of Internet Brands, Inc. Copyright © 2001-2013.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America

0.828RCU1