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Quadra 35 - 7/27/2006 8:27 PM   
corey8881


 

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From: Cilliwack, BC, CANADA
Status: offline 		I was just wondering if anyone has ever lightened a Q35, if so, how. I find this engine to be too heavy for most planes I want to stick it on.

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RE: Quadra 35 - 7/28/2006 3:06 PM   
beepee


 

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Status: offline 		corey8881,

The most effective way to reduce weight is to switch to electronic ignition. Saved about 10 ozs on my US41, which is much the same engine. You will not have anything like a modern built-for-purpose aircraft gasser, though it will still be a good trustworthy runner.

Have fun!

Bedford

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RE: Quadra 35 - 7/28/2006 7:36 PM   
corey8881


 

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From: Cilliwack, BC, CANADA
Status: offline 		I had an electronic ignition installed, cant see how that lessened the weight. What did you do to lessen it, what did you remove? The reason I switched to electronic was that the points were in bad shape. Is there something else I can remove?

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RE: Quadra 35 - 7/28/2006 9:05 PM   
majortom-RCU


 

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From: Merrimack, NH, USA
Status: offline 		My humble opinion is that in the power/weight dimension, the 35 cc gasser is a marginal performer, suitable for 'scale' power (meaning not a lot of power) on high-wing sport planes--Cubs, Taylorcrafts, etc. or big trainers with enough wing to float a five pound engine. But they can be had inexpensively, and they are useful for a gentle introduction to gas engines. Even the newer 35 cc versions are somewhat limited in power/weight, improvable to some extent with tuned exhaust. The Quadra 35 makes the Ryobi 31 look good. I own a couple Q35's, don't use them much.

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RE: Quadra 35 - 7/29/2006 12:08 AM   
NM2K


 

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quote:

ORIGINAL: corey8881

I had an electronic ignition installed, cant see how that lessened the weight. What did you do to lessen it, what did you remove? The reason I switched to electronic was that the points were in bad shape. Is there something else I can remove?



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


The EI the other fellow was referring to was the kind that replaces the flywheel and the rest of the magneto with a small box of electronics, a battery, etc. That will reduce the weight significantly.

Another trick is to break out the Moto Tool and fit it with cutoff wheels. Those cutoff wheels will go through that white metal like warm butter. You will be amazed at just how much extra metal you can remove without seriously compromising the engine's integrity.

Personally, I would just fly the Quadra 35 as it is and look around for a good model that will use its attributes. Lynch's Hanger sells a fun fly type model named the Combat 2.7. It is a giant fun fly type of model that will take off in about five feet, even with a Q35 up front. In fact, it was originally designed around that engine, IIRC.

It is a kit and the box is full of sticks and ribs, but it is a pleasure to build and even more fun to fly. In fact, I think I'm going to see if I can order another one right now. Thanks for reminding me of it.

Your Q35 will do all kinds of neat maneuvers while powering a Combat 2.7. Not to worry.



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RE: Quadra 35 - 7/29/2006 12:14 AM   
NM2K


 

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ORIGINAL: majortom-RCU

My humble opinion is that in the power/weight dimension, the 35 cc gasser is a marginal performer, suitable for 'scale' power (meaning not a lot of power) on high-wing sport planes--Cubs, Taylorcrafts, etc. or big trainers with enough wing to float a five pound engine. But they can be had inexpensively, and they are useful for a gentle introduction to gas engines. Even the newer 35 cc versions are somewhat limited in power/weight, improvable to some extent with tuned exhaust. The Quadra 35 makes the Ryobi 31 look good. I own a couple Q35's, don't use them much.



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


Yeah, but I can remember when they were the only game in town for the average modeler. They were selling at Tower Hobbies for $89.95. Remember those days?

My first giant scale flying experience was test flying a fellow's Byron Pitts and then his Byron's Christen Eagle. Both initially were powered by Q35's. I then went on to buy my own Q35, but opted to have it souped up, so I bought one from a fellow named Tom Rauch in Ohio. That ran good too.

Those Byron kits sure were underpowered by those Q35s. Later I discovered that the problem was the typical 18x6 prop that most folks were using. Not enough pitch to fly the model at much above stall at 35 mph. Back then it was hard to find props of any size that would fit the Q35. The later 18x6-10 was a big improvement, but what was really needed was a 17x10 or 12.

The Lynch's Hanger model named the Combat 2.7 is about as close as one can get to flying a performance oriented plane with a Q35, to the best of my knowledge, which certainly isn't vast.



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RE: Quadra 35 - 7/29/2006 2:04 PM   
Pelle Gris


 

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Status: offline 		Hello..

I fly a 1:3 scale, 18lb, Pitts Special equipped with a 20 year old Q35 on a tuned pipe. With an APC 20x8, at 8000 rpm, the model flies just about scale I think.
From a full power run it will climb about 300ft before it runs out of steam, and I can easily pull a loop from level flight, not a very big one, but still.... a loop.
Before I switched to the APC I had a MenzS 20x8 on the engine, and the performance was very low, full power needed just to keep the model flying, but with the APC the model was transformed. When I first bought the model I thought about putting in a bigger engine, but not any more. Flying like this is way more fun than having an overpowered 3D monster in my opinion. I can do a full power tailslide, full power tumbling, and still keep about 75% power on the downlines without ripping the model to pieces.
At the moment I´m fitting a smokesystem, and because of the "low" power I will never have to go to idle, and can keep producing huge volumes of smoke even when going straight down. I could´nt do that if I had a bigger engine fitted, requiring me to go to idle on the downlines, and thereby not produce much smoke, but rather the "putt, putt" idle smoke I see others have.

And on top of that is the fact that the Q35 is the easiest starting engine I have ever had my hands on. 1 flip starts are the norm, and the idle can be kept at around 12-1300rpm. All in all I´m a very happy camper...


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RE: Quadra 35 - 7/29/2006 8:51 PM   
corey8881


 

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From: Cilliwack, BC, CANADA
Status: offline 		Thanks for all the replies, gives me a little more confidence in the 35, one thing tho, I keep hearing about a tune pipe for it. Where can I buy one of these? All I ever see are tune pipes for glow engines.

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RE: Quadra 35 - 7/30/2006 12:49 AM   
Pelle Gris


 

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Status: offline 		The pipe I have on my Q35 is as old as the engine... about 20 years, and not made anymore as far as I know. It´s a full length pipe, but bent into a "U" shape. That makes the exhaust end right back at the engine, and only taking up half as much room as a conventional pipe. It´s a pity that it´s not made anymore, as I think the principle is pure genious.
As for a tuned pipe there are several manufactures. The one I have best knowledge of it Krumscheid in germany. They make an excellent product as far as I have seen. Go to http://www.krumscheid-metallwaren.de/ and take a look for yourself.
It does not look like he has a readymade header for the Q35, but I would suggest that you send him a mail and ask about it. I wouldn´t be surprised if he can find something that fits.
A friend of mine bought a pipe for his G-62, and with the pipe was a diagram that showed you how long to make the pipe, in relation to the desired rpm.


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RE: Quadra 35 - 8/11/2006 9:07 AM   
eric wilson


 

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From: Raymondville, MO, USA
Status: offline 		It sounds like you have quite a bit of experience with the little Quadra. Do you think it would perform well in a CAP with a 72" wing at about 10 to 12 pounds?

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RE: Quadra 35 - 8/12/2006 3:06 AM   
Pelle Gris


 

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Status: offline 		Nope.. Unfortunately not.. This is my first Quadra, and I only have about 15 flights on the engine. I don´t even know how much the engine weighs, as it was already mounted on the Pitts when I bought it.
But I unless you put a tuned pipe on the engine I don´t think that you will get good performance. Mostly it seems like people runs 18x8 props on non-tuned Q35´s, compared to the 20x8 APC I run on mine. But I think you will get scale power for a Cap of that size, meaning that you won´t be able to hover or do much 3D.
Personally I couldn´t care less, as I find 3D to be rather boring, and prefer to "fly on the wing" instead of enginepower. But that´s just me..


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RE: Quadra 35 - 8/12/2006 3:09 AM   
eric wilson


 

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Status: offline 		I hear you there. Good scale flight and aerobatics is all I'm after, if I want to hover I'll fly my helicopter.

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RE: Quadra 35 - 8/12/2006 5:46 AM   
AllTheGoodNamesAreTaken



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From: Stokesdale, NC, USA
Status: offline 		What do you think of this engine on a Bridi Big Bee? 96" wing and "claimed" 11 lbs without the engine. That would make a 16-17lb airplane.

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RE: Quadra 35 - 8/12/2006 5:50 AM   
eric wilson


 

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From: Raymondville, MO, USA
Status: offline 		Wish I could tell you. I just ordered mine today, most likely will be a month or so before I get in the air.

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RE: Quadra 35 - 8/13/2006 3:23 AM   
Flypaper 2



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From: Kingston, ON, CANADA
Status: offline 		I have a Q42, which is the same engine with a slightly bigger piston., on a SIG Cap 231 EX of 72 in WS. This is on batt. ign. swinging an 18-10 prop. Wotks very well. Won't 3D but does conventional earobatics very well.

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RE: Quadra 35 - 8/13/2006 4:46 AM   
eric wilson


 

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Status: offline 		That's what I'm looking for. If i'ts not enough, I'll just go bigger.

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