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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Trex 700 Gasser Conversion kits
12-31-2010 03:14 AM  7 years agoPost 1
kee660

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SbhTWu

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Hi,
Thinking want to convert my Trex 700N to Zenoah Gas engine.
Anyone can advive?
I only found 'Helibug conversion kit' and '**** kit' online.
helibug can fit Zenoah G290? But not carbon Fiber Frame,
**** frame made of Carbon Fiber, look nice but only fit 231 engine,
What about the Pinion Gear?

Or there is other kit for trex700 converion?
Thanks

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12-31-2010 03:15 AM  7 years agoPost 2
kee660

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SbhTWu

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Helibug and Gas.ser.man kit

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12-31-2010 03:39 AM  7 years agoPost 3
kanenarrrNovice - Korea - My Posts: All  Forum  Topic

They have lot of problem.
Observation airflow direction there is a flaw in the heat.
It has the most of heat to gather underneath the servos.
Are you cook servos?
Servo operation temperature range is -20°C~+60°C.
Did You have buy the insurance?

http://helifreak.com/showpost.php?p...9&postcount=146
overheating with canopy g270 RC

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

I have the kit HB7-RC with the G270-RC. When I fly with the canopy the engine temperature reaches 135 degrees celcius. The servos also just above the engine get too hot to. When I fly without the canopy the engine temperature stay at 110 degrees celcius. Did you cut your canopy? You have a similar problem?

Bad kit...
/
See this configuration... almost the same Zenoah but..

All the air flow is coming down side...

Base on the kit configuration, all air flow is directly to one of the two servos rigth there... We don´t get it!

cook servos? for sure!

opps...

Watch at YouTube

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12-31-2010 02:10 PM  7 years agoPost 4
TDriver

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Portage IN

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Do some reading on the helibug kit . I got one and everything i read about the heat is from the STOCK muffler NOT the airflow..

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12-31-2010 07:13 PM  7 years agoPost 5
kanenarrrNovice - Korea - My Posts: All  Forum  Topic

Do some reading on the helibug kit . I got one and everything i read about the heat is from the STOCK muffler NOT the airflow..
/

/
I'm sure!
The heat come from the engine's airflow there upward blows from the central gap cooked servos.
Don't put on the canopy you will toasted the servos.

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01-03-2011 06:58 PM  7 years agoPost 6
Rototerrier

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Fayetteville, GA - USA

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The airflow issue you are observing can be solved by building a carbon/glass plate and securing it over that hole in the plastic cover to ensure the air continues to flow over and out of the cylinder head area. You would also want to replace the stock can muffler for a pipe so that air does not deflect off the muffler and redirect back up into the canopy.

I personally solved this servo overheating issue by applying these 2 fixes. Without them you will most certainly cook the servos on a hot day.

I also cut the canopy a little high above the muffler to also ensure the air blows out past both the canopy and the muffler. It is a fairly easy set of fixes and just requires knowing how the air flows, where it flows and ensuring you get it redirect and carried out of the frame/canopy/muffler area.

Gassers Rule, Nitros Drool, Electrics...uhhh...Joule?

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01-03-2011 08:54 PM  7 years agoPost 7
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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Hey... two configurations???
/
/

According to pictures, I noted two configurations...

Motor facing front... cook servos!
motor facing rear... cook gears...

/

Saludos cordiales,

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01-03-2011 11:59 PM  7 years agoPost 8
smallplanes

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Just buy a gasser what ever brand you want but to convert i think your asking for trouble. Just my thoughts.

Thanks
SP


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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01-04-2011 12:31 AM  7 years agoPost 9
Carey Shurley

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Orlando, FL - USA

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I've been running the 600 rear facing engine for some time, there is some heat build up in the frames but I've not noticed anything significant

building the 700, I'm uneasy about the likelihood of heat buildup around the electronics but I've not run it yet so no evidence

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01-04-2011 01:18 AM  7 years agoPost 10
smallplanes

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I heard the clutch was not worth a crap on the helibug am i right or am i wrong?

Thanks for info
SP


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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01-04-2011 01:24 AM  7 years agoPost 11
Carey Shurley

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Orlando, FL - USA

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well, the "clutch" is typically a stock Trex clutch.

from my experience, at least the 600 clutch I had, had far too much gap between the shoes and the liner. I replaced it with a thicker lynx liner and clutch. so far its worked.

on my 700 I'm going to try the Quick UK clutch, which has a larger diameter and doesn't require an extra liner.

I do know that HB intends to release its own clutch at some point in the near future

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01-04-2011 01:38 AM  7 years agoPost 12
ally42

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milton keynes uk

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Helibug gasser
I think it is a shame that the posts knocking the helibug 700r/c conversion like this are made.
How many actually fly this kit and have had servo failures due to heat?
None that I know of!
In my experience my helibug has flown for 15 gallons of fuel over the last 9 months and has not had a single issue. It has been by far the easiest build, and most reliable helicopter I have ever owned. Parts replacement would be cheap and freely available, except for the fact that it has never needed any.
I wish I could say the same about my spectra g. I bought that as the british importer told me I would be far better off with a proper gasser, designed and built around the zenoah (puh) proper helicopter engine.
It has been a nightmare from the word go. The kit took 3 months to become available, then turned up with lots of small parts missing, delaying the build.
It has never been reliable losing tail drive from poorly meshed (factory built) enclosed tail gearbox, causing my first crash. Then to add insult to injury the UK importer advised me that he had no 33" tail booms in stock and I would have to wait for the next shipment in a month or two. That isn,t good service in my book - no parts back up for a kit he recommended and cost nearly twice as much as a trex 700.
In conclusion the Helibug has been excellent, and inspires confidence more and more, everytime I fly it. Surely this is what a gasser is all about, no field equipment, cheap fuel, flights of 20 minutes, no cleaning and no repairs. Just grab the bird, transmitter, and a gallon of gas, then fly all day.
Try one - you will not be disappointed!!!

Keith

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01-04-2011 01:48 AM  7 years agoPost 13
smallplanes

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What about the clutch?


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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01-04-2011 01:53 AM  7 years agoPost 14
kanenar

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Korea

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The airflow issue you are observing can be solved by building a carbon/glass plate and securing it over that hole in the plastic cover to ensure the air continues to flow over and out of the cylinder head area. You would also want to replace the stock can muffler for a pipe so that air does not deflect off the muffler and redirect back up into the canopy.

I personally solved this servo overheating ..........
.....
You must admit they have lot of potential of hazard.
Some people said CPSC will kill the Homemade Indsutry.
I say some Homemade Indsutry will killed himself.

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01-04-2011 02:09 AM  7 years agoPost 15
ally42

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milton keynes uk

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trex 700 clutch
Hi smallplanes,
I must admit that when I built the helibug I noticed a few inconsitencies with align clutches. Some had large gap,others were better. I selected the best fit a the lhs and spoke to Ali and Quick uk about loading etc. The result was that a nitro clutch is designed to grip at higher rpm than the gasser engines normally run. The quick UK clutch is heavy duty but offers no more grip than the standard, just made of better materials with better tolerences.
My fix was to make extra weights and fit them to the finger area of the standard clutch to increase the mass of the clutch, improving centifugal force and therefore giving more grip at lower rpm.
At this time the lynx clutch was not announced, and I have no experience of it.
My mod did work and is still in situ, with no issues.
When I first built my helibug I had the 20t pinion, and this may have made the clutch issue more noticable, I have since changed to the 17t pinion and find it more suited to my style of flying.

[ [
Smallplanes
As you are a machinist- i can see an opening to make these weights as an upgrade. it was hard for me to make them both identical of the same weight and fit then without ruining the balance of the clutch, only using handtools. What do you think?

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01-04-2011 01:06 PM  7 years agoPost 16
CNCjunkie

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Kauai (The Garden Isle), Hawaii - USA

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For those who are concerned about heat inside the airframe, you can read about the new heat shield. Check the HB forum under the General Discussion section for more information.

It hasn't been an issue for me so far but it's nice to see HB is listening to end user concerns and making improvements.

Just another crappy day in Paradise....Aloha!

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01-04-2011 10:47 PM  7 years agoPost 17
smallplanes

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Looks good but it could be a little unsafe,i can't see in the pic how you have them mounted to the shoe. I know of a few other company's that use a solid clutch shoe and i think that might be the answer to seam to be the only problem with your kit. I think the bored out clutch shoe could be to weak for a gasser,theres just no mass there.

Good luck and when you get it right i want one.
Thanks
Ivan


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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01-05-2011 01:43 AM  7 years agoPost 18
smallplanes

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S.C. ,SSA

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Are you using a WaterJet to cut the base plate out? Or are you using a milling machine?

Thanks
SP


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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01-05-2011 12:58 PM  7 years agoPost 19
kee660

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SbhTWu

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01-05-2011 02:05 PM  7 years agoPost 20
kanenar

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Korea

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It will cause the engine sink fin there pressure rise and the airflow will reduce.
Engine temperature rise!
For what!!!
Cook engine????
What is your specialty?

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