ASP .52 for 3d?

Glow/Nitro and gas engines, propellers, fuel and other stuff associated with making lots of noise and thrust.

ASP .52 for 3d?

Postby AE25 » Mon Sep 13, 2010 11:36 pm

ok so i read the rcmodelreview on this stating poor carb response so not too suitable for 3d.
so question is: would this be considered a cheap/reliable option if a better carb was retrofitted?

link to review here
http://rcmodelreviews.com/asp52_review.shtml
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Re: ASP .52 for 3d?

Postby RCModelReviews » Tue Sep 14, 2010 1:08 am

The problem is that it's not just the carby. The .52 is an overbored .46 which is in turn, an overbored .40.

What this means is that these engines have very shallow transfer ports to carry the air/fuel charge from the crankcase to the combustion chamber during the transfer-cycle.

When you get a spray of *very* fine fuel droplets and squeeze them through a narrow channel, many of the tiny droplets bang into each other so as to create much larger droplets -- and those larger droplets take longer to vaporize and burn when ignited.

The poor mid-range and transition exhibited by the ASP52 is typical of almost all "overbored" glow engines on the market today and comes from the way the fine spray of fuel droplets is forced to become a spray of much larger droplets when directed through very shallow transfer ports.

However, there is some good news -- the use of a very hot plug (such as the OS#7 or Enya#3 does significantly improve the midrange of the ASP52.

It's still not what I'd call a "good" 3D engine but with such a plug it has much better mid-range than when using a normal OS#8 or other medium/medium-hot plug.

It also depends a little on your 3D style. If you don't spend too much time with the engine at idle, it's far less likely to load-up and hesitate when you open the throttle.

I'm going to be throwing one of my 52s in a 3D profile so I'll post a video sometime in the next month.
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Re: ASP .52 for 3d?

Postby jeffie8696 » Tue Sep 14, 2010 2:30 am

The Aviastar 53 is based on a larger case than your typical .40 and should provide the power you are looking for.
It has similar issues with poor carb manufacture but if you get a good one they work fine.
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Re: ASP .52 for 3d?

Postby RCModelReviews » Tue Sep 14, 2010 3:10 am

I still think one of the best engines in this class you can get for 3D is the Thunder Tiger 46Pro.

Throw a Tower/GMS muffler on a TT46 and it's a real power-house but has flawless throttle response and one of the cleanest mid-ranges you'll ever find.

My TT46Pros (with Tower mufflers) will spin a 12x4 prop at about 14,000RPMs using fuel containing 5% nitro at an altitude of 1,200 feet. That's plenty of power to 3D a 4-4.75lb model with authority.
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Re: ASP .52 for 3d?

Postby AE25 » Sat Oct 02, 2010 10:50 pm

thanks for the replies
Another Q.
Any experience with ASP61fs 4stroke and they ok for 3d? Seems to be positive feedback from them for reliability and power. I've ordered one anyway for a kyosho 40 p51 so at least wont be disappointed if throttle response sucks
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Re: ASP .52 for 3d?

Postby RCModelReviews » Sun Oct 03, 2010 8:32 pm

The ASP 61 FS isn't really a "powerhouse" in the way that the Saito or YS engines are.

You probably could 3D with it but it would be pretty marginal in a 40-sized plane.

A better option would be either the Saito 82 or the ThunderTiger 75.

The TT75 is a *really* bored-out TT54 so it's quite light and has been reported as having a pretty good transition.

The Saito 82 is a powerhouse and is only an ounce or two heavier. The Saito has excellent throttling.

I hope this helps.
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Re: ASP .52 for 3d?

Postby AE25 » Sun Oct 03, 2010 9:34 pm

thanks again. i think the TT46pro sounds like a winner. Or have a go with the asp61fs on a smaller sized 3d. Saito's are a bit pricey with my skill level heh.
cheers
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Re: ASP .52 for 3d?

Postby RCModelReviews » Mon Oct 04, 2010 6:19 am

Yeah, most of my 40-sized 3D models have TT46Pro engines in them. They turn a 12x4 Xoar/JXF wood prop with authority and have excellent throttling.

If you can find one of the shiny GMS47 or Tower mufflers you'll get about an extra 800 RPMs out of the stock engine on a 12x4 with that small ($14) investment.
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Re: ASP .52 for 3d?

Postby jeffie8696 » Sat Oct 09, 2010 6:41 am

I am trying to get my hands on a TT46Pro just because all my buddies say how great they are. ;)
I know a guy that has a bunch of new and used ones for sale.
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Re: ASP .52 for 3d?

Postby RCModelReviews » Sun Oct 10, 2010 6:14 am

We've got guys here (including myself) who have tried all sorts of cheap .46-sized engines but we all keep going back to the TT46Pro.

The latest one that was tried was the JBA .46 -- not good.
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