[AJCoholic]

Ron,
Andrew Coholic here from Kirkland Lake! Welcome to RC Canada - make sure to tell the rest of the Golden Hawks to join in!

The Saito 300 is supposed to swing a 20-8 or 20-10 prop, at a similar RPM to a 50cc gasser I think, according to the literature. Not as much "go" as a 60cc class (zenoah G62, ZDZ60, etc) but maybe someone else has tried this combo?

If that fails, just take the G62 out of Tremblay's GRT-2 - he wouldnt notice would he?

Andrew

[Ron Roy]

UH!!!! He might just notice the engine missing. He is presently starting a Sopwith pup, and is going to use his 75cc twin in it. Nothing but the big ones.

Our fun fly this year is booked for June 28, rain date of June 29. for your info, and I will send a note to all the hawks about this RC canada.

But, do you think the Saito 300 has sufficient power? Or am I looking for trouble?

[Kevin McGrath]

Welcome Ron.....please do pass the word to the Hawks.There is lots of help avail here,and more than a few participants from our zone.
Hate to be negative on the Harvard,but I also think you may be a little shy on power with your planned unit.Another problem may be the short nose moment on the Harvard,which tends to make the location of the CG critical especially since your glow engine is quite light compared to the 60cc+ gasser Ziroli reccomends.You might give Nick Sr. a call and get the definitive opinion on your engine needs for the design.I called him once with a question and he was most pleasant and helpful.

[AJCoholic]

Ron,
I'll be there with my buddy Don for sure! Its on my list of fun fly's to hit this summer.

The saito 450 radial (3 cylinder) would probably be the superb powerplant for the HArvard, since it puts out the power of a G62 and would still give that scale sound. A bit "pricey" however, unless you can find one used...

I second Kevin's idea to call Ziroli - I had a few questions for the F9F Panther I will start building this year, and they were very nice to talk to.

Andrew

[Ron Roy]

I just sent two questions to Ziroli. The first one was the use of the Saito 300 or the Saito 450. The second question might best be answered by someone with the experience.

I purchased the Robarts 161 retracts for the Harvard. The plans show a length of 7 and 11/16 inches, the actual set received measured 8 1/16. That 3/8 inch difference means that even the 5 inch wheel is too tight a fit. Anybody else out there with the same problem?

[Kevin McGrath]

If you dont get an answer here,put your question on the Qand A spot on the Ziroli website
www.ziroliplans.com

[Ron Roy]

I have always known that, as a whole, the people in the RC aircraft hobby are by far, the nicest people in the world. I look in the mirror, and I am totally convinced.. Seriously though, I appreciate having access to this forum. Why should we all have to learn the same lessons the hard way.

[Ron Roy]

Nick Ziroli says that the Saito 300 would not be enough power. The G62 has 4.7 HP at 7500 RPM, the Saito 300 has 4.7 HP at 8000 RPM. I think perhaps the torque makes the difference. A good modeller friend of mine strongly recommends the 300 for the proper scale flying. Anything bigger will make it fly like a fighter aircraft, which the Harvard isn't.

Nick Ziroli said the Saito 450 (3 cylinder) would be Ok because a friend of his tried it in his Corsair, and it flew very well. Agaian, the Corsair is a fighter. Do I go for all scale and use the 300, or go for broke (litterely) with the450?

Any more inputs out there??

[AJCoholic]

Ron, in any plane I would allways err on the side of too much power rather than not enough. Just because the engine may have more than needed for scale flying, the time when you need that extra "oomph" to get out of a bad landing approach, over the tree line, etc (and you punch the throttle and see the plane climb away, rather than continue downwards ) you will appreciate it!

That being said, its your $$ but if money wasnt the deciding factor I'd go for the 3 cyl. 450, not to mention that engine would be SO increadibly cool, sight sound and smoothness. I have a review in a past issue of IMAA mag Hight flight if you want to read it.

Andrew

[Ron Roy]

I would appreciate a copy of that review, Andrew. I just came back from our monthly meeting. We will be sending in our sanction form for our fun fly scheduled for June 28. Kevin McGrath said he would try hard to attend it.

Do you have my e-mail? (ronljroy@hotmail.com). With respect to the 450 vs the 300, the 450 will give me as much scale effect, but with power to spare. It's easier to throttle down for proper scale flying, than trying to throttle up with not enough power to get out of that pinch. With respect to the cost, this is my once in a lifetime project, so hope I don't have to repeat the costs again. Time will tell!!!!

Thanks for your input, always appreciated!!

Ron