RunRyder - Raptor -Gas conversion,it's a go

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Thunder Tiger Raptors 30-90 - Imperio > Raptor -Gas conversion,it's a go

Coolheli
Senior Heliman
Location: Mississauga,Ca

I like to stay with TT for now and I've 60 kit that I would love to convert to gas power.
Did any one try that yet?

11-28-2004 Over year old.

jb_turner
Elite Veteran
Location: USA

Go here: http://www.runryder.com/helicopter/t143725p1/

11-28-2004 Over year old.

Coolheli
Senior Heliman
Location: Mississauga,Ca

Come on jb,don't tell me that the idea never cross your mind.

11-28-2004 Over year old.

jb_turner
Elite Veteran
Location: USA

No it never has. If you want gas just get one of the gas models being produced. There was a thread on this awhile back.

11-28-2004 Over year old.

docloc
Senior Heliman
Location: WI, Osceola

How about http://rotorworks.net/viewtopic.php?t=398

11-29-2004 Over year old.

HOMEPAGE

Coolheli
Senior Heliman
Location: Mississauga,Ca

docloc
excellent, I'm getting the specs on the engine but from what it looks like on the freya pics,it's almost a direct fit.

11-29-2004 Over year old.

Coolheli
Senior Heliman
Location: Mississauga,Ca

I've decided to go ahead with the project.
Main objective is to keep it simple so others can follow if I succeed.
I should have a prototype ready within 3 weeks.
Now I got to go to work so I can pay the millwright.

12-16-2004 Over year old.

inkspot1967
rrProfessor
Location: cranston ri.

cool idea let us see pics when done

Trex700e outrage 12s Solid-G Tyler Bonta Flybarless
Next-D Rave Flybarless vbar
WENZEL CANOPYS

12-17-2004 Over year old.

ole.steen
Heliman
Location: Oslo, Norway

Hi!
I have a MVVS 1.6 in a plane (2m Funtana). I think it is a great idea for a heli conversion. Beware that this engine is pretty tight when new, and needs a gallon of running in before it really performs. A lot of advice on the engine may be had at http://www.rcuniverse.com/forum/m_1.../tm.htm#1079866

Ole

12-17-2004 Over year old.

Coolheli
Senior Heliman
Location: Mississauga,Ca

Raptor 60 fan info wanted.

Does anyone know what is the speed of air exiting stock fan at hover (14000 to 15000 rpm) and what air volume is that fan pushing?

12-18-2004 Over year old.

docloc
Senior Heliman
Location: WI, Osceola

I don't know exactly the speed, but Ray's authoritve book has a section on fans.They tested 8 different fans (none of them were raptor) and at 1400 they were between 22 and 37 Vmph. Most were in the upper 20's. I don't know if this helps. DOC

12-19-2004 Over year old.

HOMEPAGE

Coolheli
Senior Heliman
Location: Mississauga,Ca

Waiting for parts,wasting valuable free time.

12-22-2004 Over year old.

ole.steen
Heliman
Location: Oslo, Norway

There is no such thing as free time

Ole

12-22-2004 Over year old.

rainflyer
Heliman
Location: dead

Coolheli, I got my R90 and have started the conversion to gas. I made spacers from 3/8" bar stock to move out the outside frames.
Check out my post in Gassers
http://www.runryder.com/helicopter/t149624p1/

12-31-2004 Over year old.

Coolheli
Senior Heliman
Location: Mississauga,Ca

Most of the parts arrived by now so my work on the project could move forward a bit,well that what I thought.The reality is totally different.After careful calculation and lot of research I found out that there is no way that the raptor stock fan or even the metal upgrade fan will provide air volume needed to cool the gas engine.With some modifications to fan and shroud we were able to push the air at about 35 mph and got about 20% increase in air volume(over the stock) but that isn't even close to what the MVVS is asking for.According to engineers I'll have to double the air volume to coupe with increased running temps.of gas engine and lower cooling area of plane engine head.Therefore tomorrow I'm ordering Bergen cooling fan and shroud.With increased size of the fan I hope to be able to push enough air to stay within the operating temp.range.Engine break in will start on Tuesday.

01-03-2005 Over year old.

Coolheli
Senior Heliman
Location: Mississauga,Ca

Kiwicocky
I'll post some pics soon but I don't want to do it until I'm sure that what I've done is going to work.I wouldn't like to mislead people (have them buy parts or better yet start cutting them)
So far I can tell you that my lower frames are spaced 3mm on each side to give me 68mm opening in the engine bay.Shroud is modified to accommodate bigger fan but that will probably change as I'm not happy with results.The new idea (my daughter came up with) is to use two fans,second one inverted.This way I'll suck the air from top and bottom of the engine shaft.

01-05-2005 Over year old.

Coolheli
Senior Heliman
Location: Mississauga,Ca

One week to finish.