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ZoomsHobbies . HeliHobby . Ron’s HeliProz South

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Engines Plugs Mufflers Fuel > CY NEW MP5 50 SB Ver
 
 
wings19
Senior Heliman
Location: Traverse City, MI

Yep, that is why people put hi flow cats and aftermarket exhaust systems on their cars, less backpressure. Uses more fuel but makes more power.

Nick
If the wings are travelling faster than the fuselage, it's probably a helicopter
06-14-2008 02:42 AM
HOMEPAGE  
 
 
TIMMMYY
Senior Heliman
Location: Roswell Ga.

Yes i agree that car motor need less back pressure but 2 stroke motors thrive on back pressure
06-14-2008 01:07 PM
 
 
HeliVIG
Expert Heliman
Location: Hearne, TX USA

Gråben,

The MP5 50SB should not use more fuel than the standard MP5 50. In fact it should tend to run a little leaner in the mid range in tic tocs and other similar maneuvers. This helps speed up the engine response in 3D and give it better power response.

It sounds like it may simply be too rich.

Remember to tune the engine with the governor turned off and lean the engine out to make peak power without misfiring or going lean. Then turn the governor back on.

I hope this helps,

Curtis
06-15-2008 05:24 AM
 
 
leadlag
Senior Heliman
Location: London

Hi Curtis,

I am considering one of these pipes to help produce more torque from my current set up which is a Zimmerman muffler on a OS 50, 20% nitro.I also use a carb smart which I have found enables slightly leaner setting than normal.

Am I correct in saying that you have designed the SB pipe to run at leaner settings compared with the MP5 thus giving a little more power?

Does the SB have any other advantages compared with the MP5?
06-18-2008 01:23 AM
 
 
HeliVIG
Expert Heliman
Location: Hearne, TX USA

It really depends on how you define it. By power I tend to mean how much of a load can something pull. The MP5 50 and MP5 50 SB make about the same total power, although the SB may be slightly more.

What many 3D pilots like better about the MP5 50SB in 3D is the quicker power response. The engine runs a little leaner and cleaner in the mid range. So with quick changes in loading the engine responds faster. If you are doing fast tic tocs, the SB will seem more powerful. If you are doing big fast loops they will seem about the same. So it is really the engine response we have changed more than the true "power".

But most 3D guys that have flown it feel the SB is more "powerful" for their flying. And that is what counts.

I hope this helps,

Curtis
06-18-2008 02:31 AM
 
 
inkspot1967
rrProfessor
Location: cranston ri.

this first thing i noticed on my hyper50 is when it had a align pipe on it ,it made pretty good power with that pipe ,but when i would do tic toc clocks i could go once around and once i try to go one more time around,the motor would just load up once i tryed to go around again. after putting the mp5sb on i could keep going around without losing any power or it getting rich or lean on me it just stayed consistent all thru the tic toc clocks. i could also lean my motor out more with the mp5sb.

the SB'S put out more power as well

Vibe50 VBar flybarless 12X Radix ATGv3
Next-D Rave
WENZEL CANOPYS
Flybars are for Pussies.
06-18-2008 03:02 AM
 
 
montarok
Key Veteran
Location: Brooklyn, NY

How does the carbsmart affect the performance of this pipe?

------------------------------------
www.carifuna.com
06-18-2008 07:05 AM
HOMEPAGE  
 
 
Gråben
Heliman
Location: Kolsva/Sweden.

Hi.
I have now tryed the SB pipe a little more and like HeliVIG write the pipe does not take more fuel.I was running to low headspeed for this pipe.Now whit right headspeed i can run it leaner whit out that the engine gets to hot.The engine is wery easy to handle and give outstanding power.The best pipe i have tryed!
/R
06-18-2008 09:53 AM
 
 
Pinecone
Veteran
Location: Maryalnd

2 storkes do not live on back pressure.

But they do like TIMED back pressure. That is what a tuned pipe does. It provides negative pressure pulse at the exhaust port when the port opens to pull more exhaust out, and in highly tuned setups, actully pulls fresh mixture (full and air) out of the cylinder, then a timed positive pressure pulse shoves that extra fresh air and fuel back into the cylinder, making a super charging effect.

Headers do this for 4 stroke engines also.

But plain straight backpressure is NOT good for making power with any engine.

Terry
Blade CP
Trex 450 SE
QJ EP8v2 EX
Gaui Hurricane 550
Vibe 50
06-18-2008 08:03 PM
 
 
montarok
Key Veteran
Location: Brooklyn, NY

I just installed this pipe, but there's an issue. The pipe is pressing against the lower carbon brace of the T-Rex 600. Will this cause problems?

------------------------------------
www.carifuna.com
06-18-2008 08:41 PM
HOMEPAGE  
 
 
leadlag
Senior Heliman
Location: London

Hi Curtis,

Thanks for the reply.

I refer to power as torque in regard to the engine ability to hold headspeed when pitch is pulled which is suppose what all of us heli pilots refer to as power.


At the moment I have a problem when the engine does not stay ontop of things in tic tocs. I put it down to my pitch management but another flyer says it does not have the torque he has so it will be interesting to try a SB and see the difference in power and recovery time.
06-18-2008 08:52 PM
 
 
Buzzin Brian
Elite Veteran
Location: College Station, Texas

FYI I put together these instructions for mounting the MP5 50 to the T-Rex 600N. These instructions will apply to any helicopter that has a carbon fiber base plate. If anyone has any questions about this feel free to let me know.



Build it, fly it, crash it. Repeat as often as needed.
06-20-2008 01:24 AM
 
 
inkspot1967
rrProfessor
Location: cranston ri.

Quote 
I just installed this pipe, but there's an issue. The pipe is pressing against the lower carbon brace of the T-Rex 600. Will this cause problems?

just shave the carbon down so it dont rub on it

Vibe50 VBar flybarless 12X Radix ATGv3
Next-D Rave
WENZEL CANOPYS
Flybars are for Pussies.
06-20-2008 01:25 AM
 
 
Funky Trex
Key Veteran
Location: Westerville, OH - USA

Has anyone else go from the MP5 to the MP5 SB? Did you have to richen the needle to keep it from getting too lean?
06-20-2008 03:23 AM
 
 
phillips942
Heliman
Location: Norfolk, Virginia USA

Im flying a 50 titan with the Radix 600 blades, OS 50 Hyper and a MP5 muffler... I also have the multigov for a good headspeed. My question to you all is what is a good headspeed to run for 3D. I was running around 2100 and i get a lot of bogging at the top end (10 degrees of pitch) so i turned the head down to 1950 and it seems better but im all about getting other's opinions so i can get peak performance out of my Rappy...

Thanks
06-20-2008 04:01 AM
 
 
Marshall Burrou
Senior Heliman
Location: Maumelle, Arkansas

Quote 
Has anyone else go from the MP5 to the MP5 SB? Did you have to richen the needle to keep it from getting too lean?
Yes, mine is set richer than it was on the other mp5. It is probably 1/3 turn richer.


CurtisYoungblood.com
06-20-2008 05:21 AM
 
 
Funky Trex
Key Veteran
Location: Westerville, OH - USA

Thanks Marshall, that is exactly what I saw. I am about 8-10 clicks richer than I was with the MP5.

... and the power is definately worth it
06-20-2008 05:24 AM
 
 
the Wasp
rrProfessor
Location: Vt

MP5 50 SB

I'm wondering what you guys are pulling for Full Throttle Pitch with the Hyper 50 ??

Jim
Buzz Buzz Buzz
06-20-2008 08:31 AM
 
 
inkspot1967
rrProfessor
Location: cranston ri.

its called Tim Allen "we need more power" ah ahhhhhhhhh ah ahhh....lol

Vibe50 VBar flybarless 12X Radix ATGv3
Next-D Rave
WENZEL CANOPYS
Flybars are for Pussies.
06-20-2008 04:55 PM
 
 
BlueGarry1
Veteran
Location: Romford, Essex, UK

Hi Guy's

How does the weight of the new MP5/50 SB compare to the standard MP5/50. Is it lighter in weight or much the same ??

Thanks

Bluegarry1

JR Vibe 50 Just love it !!
06-20-2008 10:30 PM
 
 
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Engines Plugs Mufflers Fuel > CY NEW MP5 50 SB Ver
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