26cc to 30cc engine for 73 QS YAk

[youngflyer]

im not doubting anyone of there knowledge however.....wingloading is everything and while the g26 may be 2.5 lbs, a glow engine would be half of that! also i like to learn as much as possible and i use these forums to do so. i know what yall are talking about with having experience i ran into that with a one of my students (im a flight instructer) from my club. one other note i know fairly little about engines i mean i know how they work and stuff but i cant read a plug like yall can. that is why im going to sign up for a small engines course and im in auto tech right now!

[LookNatU2]

Hello, I'm chomping at the bit to buy and try out one of these Brillelli 26cc engines.. They have done a lot of mods to them and these little babys to rock..

http://www.scottellingson.com/brillelli_012.htm

There several video's out there of people flying them on Funtana's and such. 90 size planes with 68/73" w/s and doing awesome 3D moves so the power curve must be set up right. I want to try one on the new Funtana X.
Weigh in at 2.2 lbs with ign and muffler. I have a G26 on my Scale Cessena 182 with a 95" w/s and its a pig of an engine.. (just my opinion so don't shoot me) Meaning I would never try to use a G26 for a 3D plane.

[LookNatU2]

Looked up the stats on the 73 QS YAk and it's all up weight says 11-12 1/2 lbs and i think that's on the heavy side for a 26cc engine of any maker. Brillelli also makes 40cc - 46cc and a 60cc engine and maybe a 40cc would do better to power that 73 QS YAk.
The Funtana X says it's around 8 - 8 1/2lbs and would'nt go over a 9lb plane to have the unlimited 3D where the pull-out in a hover is great. That's how I like it anyways. BTW I have a 46cc Brillelli and it has 22lbs of thrust with my Xoar 22x8 prop. It's no Da-50 but for about have the price and 90/95% of the DA-50's horsepower its a nice alternative. My 46cc weighs just 3lbs 10oz with the muffler.

[zoomer260]

Youngflyer What glow engine that weighs "half" (1.25 lbs.) could be considered for a 73" 10lb-plus plane? Since I have nothing particular against glow (I have a Moki 1.80 in a 15lb. plane) I want one of these 1.25lb engines !! Wing loading is nothing without thrust. A plane with no thrust at all would be a glider.

[rcign]

This should be interesting....
A glow G26 turns the Mejzlik 18-6 at 9600, weighs a little over 2 lbs, but 1.25 lbs is probably not attainable ...
I'm converting a G26 this weekend, I can weigh it set up as a glow engine before the ignition parts are added....Should be under 2 lbs...

A 9 lb Ultra Stik lite is ballistic with a stock unconverted G26...It HAS been done..

[zoomer260]

	Quote: Originally Posted by youngflyer
	im not doubting anyone of there knowledge however.....wingloading is everything and while the g26 may be 2.5 lbs, a glow engine would be half of that! also i like to learn as much as possible and i use these forums to do so. i know what yall are talking about with having experience i ran into that with a one of my students (im a flight instructer) from my club. one other note i know fairly little about engines i mean i know how they work and stuff but i cant read a plug like yall can. that is why im going to sign up for a small engines course and im in auto tech right now!

A OS 1.08 weighs in at 1.65 lbs.

[rcign]

And it turns a 16-6 at 8900, a VERY long way from 18-6 at 9000...

[wingburner]

Just replaced the 3W-28 with a Saito 180 I had on my 73" and lost 25 oz....Balances perfect with the battery forward....I didn't like the way it flew with the 3W-28...Was to heavy,almost 13lbs...Although I hate glow,this plane will have to stay with the Saito 180...Hopefully will fly it this weekend,I believe it will be markedly improved through the whole flight envelope.

[SleepyC]

I slapped a webra 1.20 LONG stroke 2 stroke glow in mine.
Still have to get it i the air...
I was going to do a gas motor as well.. but it seems like this little guy really needs a glow motor.

After seeing MANY different gas set up's on this bird.. seems like if you want the light wing loading and still have ball shaking power.. glow is the way to go on this bird.

Good luck!

[Ramz]

I have a Maxair Velox with a Evolution 26cc GT with the Evolution pipe. Spins an 18x6 with authority (9000 approx during the first tank of break in). Pulls my 9.5lb (approx) velox with good authority....but you do notice the added weight. The prototype velox had a YS110...it was a perfect match...the Evolution seems to have more power, but the weight is too high for good 3D. It's great for sport flying, but that's about it. I don't think gas engine technology is quite there yet with is comes to 68-73" planes while keeping the wing loading down (when compared to glow)...but they've come a heck of a long ways in the past 5 years.

[KrisW]

Well. . it's been SIX months since this thread was started. . . FIVE since the last time the person who started the thread ever replied here. . . . .


Yet some people, here, in September, are arguing over it and hurling jibes at eachother???

Here's my own input. . forget about all the modifications of G-26's and brand wars.

Look at the weight of the plane. . 10-13 lbs probably. Let's pick a motor with 17-20 lbs of thrust, that weighs in the 2.5-3 lbs range for a gasser, and 2-2.5 for a glo ( to offset the added fuel load).

It comes down to several engines in each genre

Glo: OS 1.60, Moki 1.80 or 2.10, Large Saito 4-stroke (1.80??), YS-1.40 or 1.60.

Gas: G-26, ZDZ-40, RCS-180, Roto 35, DA-50, BME-44 or 50, BME-55 (preferred engine of the bunch . .when it comes out), MVVS 45, Fuji 43.

Pick one. . . .install it. . . balance the plane. . .FLY

Now. . can all the olde guys quit stomping on all the insulting kids who have bad manners, and all the brand loyalists please return to their seats??

All these engines will do the job. Period

[randy racer]

sorry i haven't been on here in a while. i did install a 3w 28 on a 73"qq yak and it flew very well at 12 lbs. the 28 had good but not great power. a friend wanted the plane for his 140YS and i sold it to him without the engine. the 140 was not that much better that the 3W. if i was doing it again i would use the 3W or go back to a 160 os 2 stroke. the yak is a great airplane with several differant engine choises. i will try to check in here more often and if any of you have quistions i will try to help.

randy racer