Birddog-RCU

My Feedback: (62)

RTK... you only have two? SLACKER! I just counted what I have last night and was a little surprised. I have 8. Ralph Cunningham does excellent work.

RTK

My Feedback: (1)

I know I have been slacking Just don't have enough time to fly that much lately[]

Have you been flying much?? That Sukioh should be done by now

winger1955

My Feedback: (25)

Yeah im watching ebay and the other sites looking for a g62. are they all the same or are there certain kinds of models to not use?

Antique

My Feedback: (4)

All the same...

Birddog-RCU

My Feedback: (62)

RTK, the Sukhoi is done but I had to replace the hatch. It is due in next week. I suffer from the same thing you do... lack-o-time but I'm going to bust out of that excuse soon if I have time

Here are some Pictures of the Sukhoi at Castle this last May. And yes... the pilot will be set forward more when all is said and done.

RTK

My Feedback: (1)

Looks good, I have the white/blue version of that with a RCIGN1 G62 in it. Too bad I did not get to talk to you at Castle.
Have fun
Ralph

Tired Old Man

My Feedback: (1)

RTK, you should talk about getting a Sukhoi done[sm=sleeping.gif] I have a feeling I'll have it's big brother done before you do.

P3RIPPERFW

My Feedback: (5)

whats the weight difference between the stock muffler and say a slimline or bisson pitts muffler?

Nogyro

My Feedback: (10)

The best I can tell from my records is that during that video, my Extra weighed 18 lb. 6 oz. I would say I probably had 1000 or 1500 rpm left to pull out with. Plenty of pull out power that's for sure. And yes it was a stock G62, no mods, straight magneto with B&B muffler.

I've got another video taken several years back with me hovering my 20 lb. Giant Stinger with a stock G62, B&B muffler, and Mejzlik 22x10 prop. With that combo on a 95 degree day, there was very little left to pull out with. You can hear the G62 screaming away in that one. BTW I had tached that G62/Mejzlik at 7700 one time.

Tired Old Man

My Feedback: (1)

B&B muffler!? Wow!!! Can you imagine how many more rpm you would have been developing if you would have used a Bisson, Abel, or some other type? The B&B is pretty much little more than a side mount 90 degree turn with a whole bunch of restriction.

Nogyro

My Feedback: (10)

Be careful what you Silver, there are newbie's on here.

Tired Old Man

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Perhaps, but you ain't one of 'em That B&B "muffler" is still constipated, though.

Nogyro

My Feedback: (10)

Here's the video of my 20 lb. Giant Stinger with a stock G62/Mejzlik 22x10 prop just for sound comparisons......

http://media.putfile.com/Franks-Giant-Stinger

Tired Old Man

My Feedback: (1)

Yep, sounds like a BIG chainsaw. Good flying, so smooth it requires almost no control travel!! Like I said, you ain't one of the newbies

Nogyro

My Feedback: (10)

I just about wore that GS out learning how to hover. Ran 60 gallons through it, then sold the plane for $200 and bought my first bunny......

RTK

My Feedback: (1)

Dang, your giant stinger sure looked a lot better than my 15 yr old giant stinger (with a g62) I still have in my attic.

Whistling Death

I keep hearing about the great service from DA on their engines. I read on here that DAs break down a lot. I hardly hear of G-62's having to be sent back for repair. It seems to me that the G-62 is far and away a more durable engine. Anyway I would take one of Ralph's converted G-62s over the overpriced DA 50 anyday.

xtdsm

Maybe you don't hear about G-62 being sent back for repair much because they are just not as commonly used as the DA50.

Just a thought

eugene

XTDSM,
Zenoah engines are not commonly used??? I'll accept that as RC humor...

Tired Old Man

My Feedback: (1)

The stock Zenoah muffler is a bit on the heavy side being steel. Bisson is a lot lighter than a Slimline smoke muffler. If you're into smoke, all you need is the nipple that comes pre-installed on the Bisson. The smoke stuff in the Slimline is not needed on a gasser. Gassers don't need a smoke coil.

As for not many Zenoahs in use, up until recently there have been more Zenoahs used in large warbirds than about anything out there. The two biggest players in the warbird/scale group had been Brison and Zenoah with Zenoah holding the edge in numbers.

mstroh3961

My Feedback: (4)

The Zenoahs are more robust, but it comes with a weight penelty. The DA-s are used more in the aerobatic aircraft in unusual attitudes and encounter more stress, IMHO, which accounts for the mechanical issues.

Pick an engine that tripes your trigger, its all good.

Kweasel

My Feedback: (29)

The part that is failing on those DA50s is the lower rod bearing. This seems to be a reoccurring theme every time a MFG tries to save 3oz. by using a cantilever crank. They all make the same mistake by using a standard 3 piece crank with the back half removed. A really good one piece crank could be made but its too expensive for these small manufactures, they would have a lot more money in the crank than they have in that pretty case that sells so well. The DA50 looks and runs good, they just didn't put the design effort or manufacturing investment that the Europeans did. The ZDZ crank is very nice but could have been even better with a stiffer design.

Antique

My Feedback: (4)

I don't see how anyone can say a DA50 is stressed more than a GT80 turning 12,000 rpm in a race plane
Maybe if DA50 owners would use a prop that didn't lug it down so far the bearings would last longer..Like running a car in high gear up a steep hill..
Just because the engine WILL turn a big prop doesn't mean it should be run that way...
Nobody removes the back half of a three piece crank to make a cantilever, it needs the back web for the weight..ALL cantilever cranks are made just for the engine...It's cheaper to make a cantilever than a three piece crank anyway..No need to make 2 parts EXACTLY alike and press a hardened steel pin between the parts...
Cantilever cranks got a bad rep when A&M tried to do it...Wasn't the fault of the cantilever, their three piece cranks were junk too...You can't skimp on bearings and materials...

Wings-RCU

My Feedback: (2)

Ralph, it’s not the R's but the lateral forces placed on crank bearings from gyroscopic forces. It's the reason full scale aerobatic planes also tend to tear up engines & mounts.
If turning R's was so hard on an engine then turbines would be a disaster. I also believe that turning a small prop fast is easer on an engine crank & bearings than a large prop in 3D. Of course pistons & rings is a different matter, but that is not where the engines are failing.

mrbigg

My Feedback: (21)

exactly. The bearing is basically pounded into submission. Same for cars and trucks.