Looks like the SAP 180 is the way I am going. Looks like the rear exauhst will be far easier to set up. I just took a side job putting together a H9 Ultimate in exchange for the engine and pipe so should have the engine in a few weeks. That will give me time to finish the plugs for the canopy and wheel pants, get the wings and stabs cut too.

Do you cut your own foam? What type equipment do you have (CNC or template and gravity driven)?

I need to get some foam cut with a very high taper ratio (root chord to tip chord ratio). PM me please

Finally, some rear exhaust gas engines.

DLE 35R
DLE 55R

But will the header and can be available at launch....?

Are you sure, these engines are really DLE ?
The global shape don't match...

have you a link ?
Thx

The rear exhaust engines are discussed on a different forum. RCU will not allow a link to the other forum.
You will have to type f l y i n g g i a n t s (no spaces) into the space where **** appears in the link.

http://www.flyinggiants.com/forums/s...t=72869&page=8

There is no official word but the engines were confirmed by Jedijody who is a reliable source. The rumor on the other
forum is that the engines will available in May.

And add a .com as well.
Magne

Anyone seen this? Rear exhaust. 36cc Pterodactyl
http://www.troybuiltmodels.com/items/PTE36R.html

Hello Joe

I'm going to install this engine on a personnal design plane named Passion made by friend of mine.
The manufacture of this engine is very beautiful, molding is equivalent to the one we used as glow engines or cdi.
What is surprising is the weight. The assembly as in the photos weighs 1250 g /2.756 lb (175 cdi fitted equally weighs about 1230 g /2.712 lb, which must be added the weight of the flexible support approximately 120 g/ 4.233 oz to 150 g/ 5.29 oz).
Cost is less 300 E.

Cool engine setup!!!! Cool fuselage too!!!!!!

Hi,
Is that hard mounted and using a simple can for exhaust.
If so it will be a threat to flying sites, noise nuisance wise, never mind about passing sound tests for F3A.

Brian

I saw that too, and I tend to agree. If I were to hazard a guess though, I would say that Claude knows that.

We know how to quiet them......Quieting a gasoline engine is no different than quieting a glow. I have a bunch of information on RCU on exactly how to do that. Even something as large as a DLE55cc.

The noise re-directors gas engines are equipped with, their so called mufflers, do not have to be used. Pipes and soft mounts along with large, higher pitched props, become mandatory items for noise suppression, just as they are for glow.... I use ES Composites carbon pipes, but the Mintor aluminum pipe for their 38 cc engine works fine also at only a 45 gram weight penalty; but at about half the cost of the carbon pipe

Hi Matt,
I knew I was stating the obvious - sometimes it's not the worst thing to do - just in case there are any sheep browsing here.
Can you post a link to those ES pipes please.
I assume they are ok with the temp's if you are using them.

Brian

Hello Brian , Matt

It is not my plane. It is the plane of a friend, his first pattern. I'm finishing the plane for him. I'm going to install silent blocs to prevent fuse of vibrations.
He is student, he wants to start in F3a pattern the cheaper. So it is not possible for him to buy motor, batteries, Yamada of course !
He prefers to do noise and fly pattern instead of not flying !

It is not the subject of this thread, but that is the problem. F3A became very expensive not only for student. Now I don't see a lot of new pattern modelists. In contests and french championship, number of competitors decrease in France.
May be money is not the only reason.

Now we are lucky not to have problem with noise. Our fields are near real aerodromes and far away cities. Great models make more noise as us.
Pictures of "La Fare" field and "Eyguieres" field.

Serious Power, link of ES Composite
http://www.escomposites.com/petrol.htm

Brian,

Never had a problem with exhaust heat in my gasoline planes (3 years)..... about 1000 runs on 4 different carbon pipes (1 30G, a pair of 40G and 1 55G) from Ed Skorepa. I understand heat transfer and chemistry well tho, and take every caution to keep things from overheating. Ed uses high temperature epoxy systems in his pipes, both gas and glow, but the pipes must be properly ducted. Nothing fancy, just sound ducting with reasonable clearances between pipe and airframe, to keep the cooling air as turbulent as practical in fully enclosed set-ups

Claude, very nice fields...

In the current economic conditions it is difficult for many to spend the kind of money to outfit an F3A plane or two for competition. Newer gasoline engines available such as the OS33GT, offer the same or better performance than a YS170. The weight is similar. The purchase cost is about 50-60% compared to YS. Operation cost is about 15%, even with expensive avgas. Maintenance cost is practically no cost for gasoline engines, annually.

Bottom line, new gasoline powerplants are really strong, are absolutely reliable, have simple field manners and are cheap to feed and maintain. In other words just perfect for our needs

The biggest issue is this... the US Pattern community is almost completely converted to electric power and if you're going to run glow or gas, you simply have to be better since it is no longer the norm. I understand that kind of mentality and have accepted it as part of trail blazing a new path in Pattern. Perhaps Europe is better in that regard

Going forward, it sure would be nice someone would come up with a contra-rotating setup for the petrol engines....