Hey guys, I just bought a Pheonix Super Decathlon. I have a new .75 ringed super tiger engine that i considered putting on this plane. Will it be too large of an engine to run on this plane?

Thanks

Justin

Without knowing the engine rating of the arf, I guess a plausible answer is the engine is too heavy if you have to add alot of tail weight to get the plane to balance. The ST .75 is fairly underpowered, so it might be ok if the weight is good.

Its a 40 - 46 sized plane.

This is a recent thread.

http://www.rcuniverse.com/forum/m_5185407/tm.htm

Justin, you can do a thread search and dig up quite alot of information on this and the Seagull version. You will find that many have used up to a .91 four stroke and always have the typical "insane power" and "unlimited vertical" comments but they always have to add wight to the tail to get it to balance. There was a recent thread from a fellow who installed an OS 55 AX and that worked extremely well. Suggestion here would be to try and keep the model light. I put one together with a 46AX and had a ball with it and it balanced perfectly and had a ton of power for anything you wanted to do except the "unlimited vertical". The weight of the ST 75 would make you add weight to balance although you would have more than enough power. The other thing about adding too large an engine on this model is that prop torque or "P" factor makes the plane a real bear to handle on the ground during take-off runs. It was already a handful with the smaller engine.

thanks a lot guys. Happypappy, thanks for the good information. Ive been thinking about it and I think im going to try to keep it light and use a smaller engine. Im not looking for unlimited verticle perfomance either. What happened was Tower sent me the wrong engine and I thought i might be able to use the this engine. Back to Tower Hobbies it goes. Thanks again

Justin

I put a TH .75 on the Seagull Decathlon and it balanced perfect without a single gram of lead.

sparman - For what's it worth. I'm located in the Denver, CO area and fly at 5200 - 5400 feet altitude.Have one of those planes with an OS 46ax and its a lords plenty unless you want to get real redical. Last two flights, when it got above freezing, were with skis and handled that nicely. Unfortunately ran out of fuel and had to hike a long ways thru knee deep snow to retrieve.

As one of the other gents said - its a bear to get off the ground.

Harc

I have two of them... One has a Saito .56 in it and one a Saito .72... The .56 flys real scale like.. You have to get speed up to do a large loop... The .72 is a perfect match for me... The plane can be a little squirly on the ground... With the .72 there is enough power to get it off quicker if necessary... Also I find the extra power helps in crosswinds, go arounds etc... I think if you underpower it you get bored with it real quick.... As for CG I mounted the batteries back in the tail and it balanced right on... Great plane, I am sure you will enjoy it...
I also have the Seagull SD with an .91 four stroke in it... It too is a blast to fly

I have an ASP 52 2 stroke in mine and its a rocket. Take offs are quick and it certainly doesn't need any more power than this! [8D]

I have an OS 70FS II in mine and it is an excellent combination - a lot more power than scale. It can be a handful on the ground so getting it quickly in the air is a bonus. This engine runs so well that I ordered another one and have absolutely no idea what I am going to put it in. Your ST 75 should be similar if not a bit more power than my set up so it should do fine. I did have to add some weight to the tail.

Howard

Hi all! I have two choices for my recently acquired Phoenix SD. A Thunder Tiger 46Pro or a Saito 65. What thoughts do you guys have for preference?

That's easy, a great looking plane with a great soundind engine (Saito)... Does it get any better

Either one will give you a good performance factor but for what the plane is meant to do, I would go with the Saito.

Well, against the good advice of the masses, I am going to use the TT46Pro and save the Saito for another task. I have hit a snag though. The throttle linkage looks as if it will line up directly through the fuel tank to get to the carb. Anyone have a quick fix for this? Pics would be a welcome sight also! Thanks

Finished assembling the Decathlon this afternoon. Balances with 1 oz. of lead on the tail. Now I remember why I had this plane the first time! What a beauty!

Finished my Decathlon last night! Hope to maiden when the weather clears and warms a bit. Attached a couple of quick snaps. Sorry for the poor quality. Taken at night under the carport with a cellphone!

Looking good... Be sure and give us a flight report when you maiden it... Curious to find out how the .46 handles it....[8D]

The TT46 flies it with authority. I know because once of my buds has one with the same setup. Also, I had one previously with an OS46AX that was planty of power as well. Not unlimited vertical, but no slouch either. Nimble and quick.

Maiden successful! The motor isn't quite fully broken in, so I think there is a bit more power there. We'll get another shot when the weather warms. I am very pleased to have this plane as a part of my hangar. It looks great in the air and was an incredible value. I am amazed at the rudder response this plane has and will definately be toning it down and adding in some expo. Roll rate was a bit sluggish, but that too can be adjusted. It will just take more flying time...

Your roll rate will pick up with added aileron throw and it is going to do incredible snap rolls as well. Will be very surprised if you don't like the power and performance of your combination!

mtwister,

I don't know where you get that the ST75 is underpowered............?????? A lot of scale warbirds recommend this engine for in-cowl installations for airplanes weighing 10-12 pounds unless you are talking the talk of most sport pilots that demand unlimited vertical. This is an engine that will fly a 10-12 lb airplane in a very scale application..........so if you are one of those that demands very overpowered aircraft this engine will not do......but if you are looking for more scale than this engine is just fine. Real airplanes do not take off in 10 feet and do 3D operations which are operations that real airplanes will not do.

Regards,
Andy

Yeah I was wondering the same thing.

The SuperTigre .75 does fairly well, if you believe the marketing hype it's rated at 2.18 bHp while the TH .75 is 2.2bHp... not much of a difference.

I have one of each on different planes and it has NO problems pulling a 7-9lb plane around (Skybolt ARF) w/Unlimited Vertical let alone a .40-.46. as the poster asked about.

I think that the ST .75 is being confused with a four stroker of the same size.