SitNFly

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A while back, I replaced the Brison 3.2 in my Aeroworks 29% Edge with an RCIgn G62. I thought I would post a few pictures. The Brison is a fine engine, but I fly at two fields, one at 5300' and the other at 5800'. Power with the Brison was good but vertical uplines were real power drainers. Especially if a snap or roll were thrown in. So I figured an engine upgrade would be an interesting experiment. An excellent description of the RCIgn converted G62 can be found at www.tompierce.net where it's being used in one of Neo's new warbirds. I bought a new G62 off of Ebay and asked the vendor to ship it directly to RCIgnition. The eBay vendor was excellent and shipped it with no hassles. Cost for the engine was $277 shipped. RCIgnition charged $175 for the electronic advance ignition conversion and tapped it for smoke at no charge. Shipping back to me was included in the price.

Here's a couple pictures for a size comparison.

SitNFly

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Couple more shots. The eBay engine comes with a heavy steel muffler which I replaced with a Bisson side dump muffler. Weight for the Brison with muffler and ignition was 4lbs, 1.4 oz. Weight of the RCIgn G62 with Bisson muffler was 4lbs, 9.6 oz. So I gained about 8 oz in the engine compartment. Still need the battery and switches so a push there. The RCIgn engine had some damage on the case just where the new mount was installed. Don't know if it came that way from eBay or happened during the conversion. It's cosmetic in nature, so I'm not worried about it. The RCA plug is for the battery connection. The conversion is very neat as you no longer have a separate ignition module as with the Brison. It'd be super clean for a narrow cowl application.

SitNFly

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Final few shots with the new RCIgn engine installed. Ralph can cut the prop hub to your specifications. So if you know your desired engine length, you can eliminate spacers. I just installed a couple washers for right thrust and it fit right back in the cowl where the Brison had with minimal cowl trimming. I had to relocate the throttle servo and linkage also. The prop bolt supplied with the engine was too short to accommodate my spinner, so I bought a new bolt locally. A machinist at work drilled and tapped the bolt to fit my spinner bolt. I set the needles according to the directions provided by Ralph with the engine. I got a peak reading of 7600 RPM with an NX 21x8. I richened it up to run at 7400 for flying. My Brison turned the same prop at 7200, so I've gained quite a bit, especially for a new engine. The plane's all up weight went from 16 lbs, 5 oz to just under 17 lbs. This is because I had to add a couple ounces in the tail to get the balance back. Initial impression is that the engine will be a worthy replacement. I've been too busy to fly it yet, so I just need to get some hours on it and see how things go.

Nogyro

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Looks great! Ralph's got my G62 right now doing the same thing to it. Can't wait to get it back..........

Westbender

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You should be able to get a bit more thrust out of the G62 with a little more prop. I believe the recommended prop for that engine is a 22x10.

Tired Old Man

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I agree. You're under propped with a 21 incher. You may find that a 23 incher will perform a little better that the 22-10. That will be a personal preference thing with the airframe the engine is pulling and your type od flying.

Now if you guys want to get the weight down a little more RCIGN had come up with a proceedure to shave some ounces off the engine sometime back and it works out quite well...

Westbender

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What's the procedure for the weight reduction? Is that a trade secret for RCIGN or can you share the info?

Tired Old Man

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It's a shop thing that Ralph does. He's the developer and expert so he would be the best one to speak with regarding the machine work.

Antique

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No secret, much of the extra weight people talk about when comparing a G62 to other engines is the heavy mag rotor and source coil..
Cut the crank flush with the rear seal, replace the magneto with electronic ignition...
Make a short lightweight mount, put the ignition and syncro module inside..
Make a lighter prop hub..
Comes out right at 4 lbs + or - a few ounces, 1 or 2...
You can make a 3 lb 10oz G62 by using a separate ignition and flat plate mount with the lightweight prop hub...
I still don't know why it took me 16 years to figure it out
Even lighter is a 62cc made from the same chainsaw the cylinder and piston come from.
The chainsaw crank is a little smaller diameter on the front, and the case is magnusium alloy, and a spearate ignition box..Haven't made this one yet, maybe next week..3 1/2 lbs maybe ?

Wings-RCU

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RCign,
Why are people getting 4# 10 oz engines from you? A 4# g-62 would be great, something I would buy. A 4# 10 oz engine is really not appealing to me. An extra lb of weight is a lot of weight for a 15 or 16# aerobat.

Tired Old Man

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Good question. I guess you could get one that's heavier by getting one stock, brand new, equipped with a magneto, from the usual dealers. It would be difficult to get a 62 that's lighter than a 50 but I suppose that search will have to continue for awhile yet. Using a 62 in a 15 pound plane could be thought of as massive overkill.

Antique

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I can make one lighter than 3 lb 10 oz...Use a cut down chainsaw crank and case, cut the threads off the crank and use a 5/16 grade 8 bolt for the prop with a shorter hub, use an aluminum plate for the mount with separate ignition in a box..Drill the back shaft of the crank to lighten it..Trim the cylinder fins...Use a WT76 carb, lighter than the HDA48. . Use a CM6 spark plug, lighter than the RCJ7Y..the engine is only about 4 1/2 inches long and runs the same...Only $600, just like a 50...Think anybody would buy one ? Fat chance...
The cowl of the plane would have to be opened up to let the cylinder hang out...That's a MAJOR no no to most of the pilots out there...

geardaddy

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I have 8 of the lightweight Zenoah 62cc saw engines here that convert into the lightest and peppiest engines for the money. Can send direct to RC if there is interest.

Kweasel

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It seems that fashion has become the single most important part of giant model aircraft. If performance was the primary focus then big models would look more like purpose built pattern planes. In a more objective world an E/I G62 with a good exhaust system would be very desirable as the power:weight is competitive with purpose built engines. Giant scale fliers are the aristocrats of model aviation and they do act accordingly.

Tired Old Man

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LMAO

How right you are

captinjohn

Talk about G62 engines, I seen a Mustang today with a G62 on it and it was one fast bird. The engine sounded perfect!!! The plane was a 1/5 scale ARF. It also had retracts. Was clearly the fastest plane at te Giant bird fly-in. Capt,n

Antique

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Our USRA AT6 racers are doing 130 + using special APC props..Planes weigh 25 lbs...Stock engines, no metal can be removed or added..I am the inspector...We use Mac's products straight pipes, turn 8000+ in the air...
Pages of pictures on the gallery at usrainfo.org

Tired Old Man

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I know one of the guys that fly those things. Think Excaliber. Those puppies be fast!!

Antique

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The AT6 class is almost dead, but the NA50 variant of the AT6 flies in the unlimited class...245 mph on radar, Aerrow 200 twin, 21x25 carbon prop, 10,000 rpm...

acesmike

LOL I put mine in a Giant Big Stick with a 20x10 (yes underpropped but even with 6" BBQ wheels i had just enough clearence) Needless to say It was taching about 9k and would hover at less than 1/3 throttle. Too bad I had a main battery failure and it went in :-( Now its going in my 80" P-51 (should be about 16lbs) with a macs pipe and header! I love power. Muhahaha...

gboulton

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Just had to jump in here...I know it's an old thread, but acesmike brought it back to the top, and I never pass up a chance to rave about Ralph's motors...

I've been flying one of Ralph's "magic" G-62's for over a year now, and have another one just about to go on to a 33% Pitts S2S I'm scratch building. A few comments:

1) You absolutely can NOT go wrong with these things. The G-62 is pretty much bullet-proof ANYway, and with less weight and an electronic ignition, it delivers SUPERB power:weight...and it's easy to start to boot!

2) Ralph absolutely stands behind his work. If there's ANY problem (or even an "imagined" problem because the owner is clueless *heh*) he's readily available, and more than patient.

3) As a practical example, just today I weighed my "new" G-62 (the one for the Pitts) completely firewall ready...ignition battery, switch harness, and slimline smoke muffler. It came out at 83 oz : 5 lbs 3 oz ready to fly. That's EXACTLY in line with every 50cc powerplant on the market, given those conditions.

4) As the original poster pointed out...it's not the least bit surprising to be able to pick this engine up for $400 INCLUDING Ralph's mods, and many sellers will ship it straight to him. Toss in $100 or so for a smoke muffler, and you're STILL looking at $500 or so, ready to go, WITH smoke. That's a heck of a value.

In short...a SUPERB combination worthy of consideration for ANY 50cc airframe.

krayzc-RCU

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sounds great!