mfuess

Let's see; My Pitts Monster is designed for a 60/90, and my RV-4 is designed for a 90/120. Both are smaller than your YAK and both are powered with BIG gas engines... and they fly beautifully. My Monster is approaching 300 flights with the Venom 45, and my RV-4 is at 40 flights with a DA-50 under the hood. You will be ASTONISHED at how much better your YAK will fly when you're slinging a 22" prop instead of that piddling 16x6! Buy hey... it's your airplane and you need to fly with what you're comfortable with!

Mike Miller

I have been out of the rc bug for a while, but have been flying collectively for quite a while. I know that you have more experience than I do, and appreciate all the good advice that you are handing out. I have also had models that were grossly overpowered and loved them, but sometimes the extra weight is a bummer, especially if you have to add weight to the tail. How did you handle this on your 60-90 pitts?

mfuess

I merely moved the elevator & rudder servos to the tail. This balanced the Monster perfectly. I also did this with my RV-4 as well. No added weight needed to balance the engines.

mfuess

About 17 pounds with 20x8 prop, 21 pounds with 22x8, 20 pounds with 20x12 CF.

azhar

My Feedback: (19)

Ok guys,

Finally got around to fly the aircraft with the Venom 45. It is on a yet-to-be-named airplane that weighs in close to 14 lbs. The engine is turning a XOAR 20x8 @ 7400 rpms and a 21x8 @ 6900 rpms. Transition is smooth and hover is at about a third to half throttle. It powers out of the hover smoothly but is not a rocket. A 13lb airplane would probably have that rocket effect. Overall a good engine that performs very well so far.

The next thing i am planning to do is replace the carb with a Walbro wt-540. Looks like a direct retrofit with no mods. Will probably try that out on the coming weekend. if what Mark says is true, than i expect at least a couple hundred rpms gain. Mark, this is the engine marked 'B' that you tuned.

Fuel mix is 50:1 (Belray MC-1).

mfuess

Azhar,

If it recall, engine "B" was the stronger of the two. But din't trust my memory... I have to look at my drivers license to what my name is!

Those are very good numbers, but if you "feel" the need for better vertical try a Mejzlik 22x8

If you can't locate a WT-540, then get a WT-610. It's a "newer" version of the 540.

azhar

My Feedback: (19)

Mark,

I got hold of two WT-540 for $24. And they are brand new. And yes, 'B' was the stronger of the two. The other one is going back in the Chipmunk as soon as I get my garage re-cleared. I have a project going on.

Azhar

Mike Miller

Hey guys,

I see that there are quite a few of you online, so I thought I would drop in and say HI. I finally got off high center and ordered a V45, it was shipped yesterday. Now I have to decide what airframe I am going to put it on. I don't have anything large enough in the hanger right now, so it's more shopping.

Like you, Mark, I have always loved flying biplanes, and your pictures of your monster pitts have me thinking although I know what a beast a real pitts can be, and would expect it's smaller counterpart to act the same on the ground. I think I have about 20 hours in a S2 and man does it give your feet a work out!

If anyone knows of a good strong, nice flying and reasoably priced airframe that they would recomend for a V45, please chime in.

Thanks!!

mfuess

The World Models ULTIMATE Bipe would be nice... http://www.theworldmodels.com/para/p...airplaneid=123

This is a 27% bird and flies EASY! A Venom 45 will fly it well.

72

How about this?

Andy Sheber 33% S1 Pitts

http://www.rcguys.com/S1Pitts.htm

azhar

My Feedback: (19)

72,

It would be impressive if they can meet that weight #s with that size bipe. I kinda doubt it but I can always be wrong.

Azhar

72

There is supposed to be a review of this airplane in the current issue of Fly RC. Don't know what engine or anything, but the video of this plane flying looks good.
I also located the Model airplane News issue November 2006 that has a review of this airplane using a Revolution 50. It comes in at 16 lbs. The engine is listed at 51 oz., but does not say if that includes the ignition and muffler. I doubt it. They really liked the airplane.

mfuess

72,

Airplanes (like anything else) is subject to critisizm. What I like doen't mean anyone else will like it. It all depends on what you are looking for. I like bipes, especially hot areobatic ones. But you may hate them with a passion. So, the only prudent advice would be is: Consider how "you" intend to fly, and look at planes suitable for your style.

azhar

My Feedback: (19)

a bipe, any bipe, is going to be draggy. If I am flying a bipe that size, I would like to turn a bigger prop. Currently, with the stick carb, it turns a 21x8 (XOAR) @ 6800-6900 rpms. I think you may be disappointed depending on what type of flying you are trying to do.

I just installed a wt-540 carb on my Venom and am going to run it in the next few days. The performance should increase. Watch for my postings. Mark may be able to chime in and give you numbers. I think he knows of a guy that is running it with one.

dubflyer

My Feedback: (1)

There is an Electric conversion of a Waco from Cox and an electric Curtiss Jenny on Fly RC October issue #47

No mention of a 50cc Bipe.

I am breaking in my Venom 45 with 20:1 Lawnboy ashless ................I have now switched to 32:1 same oil for the next 3 gallons. I hand some issues with engine surging when I put a 550cc tnk of gas through the engine on the next the engine would not stay running. I asked Tim for hints and afterwards leaned out the low end.............it is now running again.

I also noticed that the carb was spitting fuel so I added a Velocity Stack from Tower $8.99. This cured the fuel problem and now I had to lean the Highend from 4 turns to 1 3/4 turns.............also I leaned the lowend for a beter transition. I have to run some more fuel through this setup to know if the engine is stable.

I noticed a lot of vibration with the Venom 45 and am hoping that after the breakin that it will smooth out as I do not want to destroy my RCGUYS Decathlon.

I have a DA50 ; 2 x Taurus 53; a Fuji 43 EI; a Zenoah G45 EI; 2 x BCMA 26cc. all good running engines and smooth for single cylinder gassers. The best for smothness so far are the Taurus.

I would like to hear from the many Venom owners out there as to their experiences so far with their engines. What planes are they on and how are they mounted etc.. Pics if possible

Here are mine:

azhar

My Feedback: (19)

Dubb,

What prop and numbers are you getting? Mine is fairly smooth and number are listed above.

3D_Junkie

How is the lifecycle testing going?

dubflyer

My Feedback: (1)

Hi Azhar,

I am spinning a Bolly 20 x 8 for break-in. I get 7300 RPM with this prop.

The Decathlon weighs about 14 Lbs so I know this will be more than enough engine for this bird. I have a Zenoah G45 but since it weighs 4.5 LBs with EI and Muffler Vs 3.5 LBs for the Venom I wanted the lighter motor to get the correct balance / CG without adding additional weight.

Hopefully this motor will smooth out soon as I have already 2.5 Gals of fuel through it on the test bench.

The last thing I did was to install the velocity stack but since I was almost out of fuel when I installed it I did not get a good feel for how it will perform over a 30 Min engine run.
I need a side dump Muffler to fit all in the Decathlon cowl...........Tim said the B&B folks have a suitable muffler

Best of luck with your WT 540 carb tests.

Martin

azhar

My Feedback: (19)

Dubb,

I got 7400 with the XOAR 20X8. We played with the wt540 today, The initial number for the 21x8 XOAR is 6800 rpm (same as the stock carb) Did not get a chance to tach the 20x8. The engine was rich at the low end. Will post more numbers over the weekend.

Azhar

azhar

My Feedback: (19)

Ok here are more numbers. Changed the oil mix to Amsoil 80:1 and ran the engine. The Xoar 20x8 jumped in rpms by 300 rpms to 7700 rpms. The engine is a little rich still (just slightly). Also another thing to note, the engine ran cooler. I left the 21x8 prop home but will run it tomorrow and post the numbers.

dubflyer

My Feedback: (1)

Hi Tim/John,

I am having major trouble with the Carb. The engine is starting for a few seconds and dies.

I replaced the ign and still the same issue. We cleaned the carb.............still the same issue. I replaced the sparkplug ..........no differencen.

Some of the folks at the field are very familiar with gas engines and they advised me to 1) Ceck both needles.....removed and cleaned plus flushed fuel through the openings 2) clean the carb; 2) Check Ign 3) Check Sparkplug.

Right now I am boxing the engine for return to John at OMP. I do not have enough time to mess with this anymore as I have lost 1/2 my week-end already putzing with this and no flying.

I was hoping to mount this engine on my Decathlon and go fly this week. The engine never ran smooth............always knocking some at idle - 4500 RPM.

My colleagues at the field feel that most of my problems are due to the carb. After following the breakin instructions to the letter I am very dissapointed that instead of the engine running smoother it is anything but and I would not attempt to put this on any plane..............an opinnion voiced by another Venoom 45 owner who witnessed the problems and amount of time cossumed to try to get this engione to run. He is the one that loaned me the ignition from his motor to try.

This week-end we also had a visit by Mr Casey Rowe at our field and he along with many others incl Jack Youngblood and Ron Nessler offered many helpful suggestions time and hands on support. I want to thank them all for putting a tremndous effort into trying to get the Venom 45 runnig.

azhar

My Feedback: (19)

Dubb,

Check your batts and connections. If you have a loose connection, you might have it showing up when engine starts. Switch could be an issue too.

azhar

dubflyer

My Feedback: (1)

Hi Azhar,
Good area to start with.. The only component I did not replace was the Hall sensor ............however the engine fired and started every time it just quit after a second or two.

Batts and connections checked.............Changed out wiring and Ignition.........Thanks to Ron Nessler who was on hand and gave up many hrs flying just out of interest to get to the bottom of this issue.

All the guys who spent 3-4 hrs checking; testing advising finally said to get it back to the Manufacturer ASAP since I should not expect to have these issues with a new engine.

I have 6 other gas engines and have never had to spend two week-ends fiddling to keep anyone of them running.

The engine is on its way to OMP from whence it came.

Thank you for your interest.

72

Dub, this has to be a one of a kind problem. I had never even seen a gas airplane fly in person before and when I got my venom 45 I followed the starting directions and away it went. Has started and run great ever since. I had a concern over fuel spitting from the carb when it was running, but Mark Fuess fixed that problem with a velocity stack. Maybe your timing is way off or something.

SERCE

NOT GOING TO GET INTO THIS MESS BUT IF IT REQUIRED A VELOCITY STACK, IT SHOULD COME WITH ONE !
I AM DONE WITH THE WHOLE OMP/COPPERHEAD OUTFIT......^%$#@