I have a Saito 90 triple. What models are folks recommending for this engine? I assume it has to be very light as this in not the most powerful 90 plus it needs a fairly short nose moment to handle the weight.

Second question, do folks run this with a glow assist of some sort or is it reliable without? If using glow assist, what brands are favored?

I appreciate everyones comments

Lucky you! I have always wanted a 90 radial.
I would build an Eastbourne Monoplane from the excellent [link=http://www.rcmmagazine.com/store/store-plans-catalog-tem.html?item=plans:PL-776&sid=0001Q7Yn0hoV5dkRQQ6M0k0]RCM plan by Pär Lundqvist[/link]. It is an pre-WW I aircraft that has a lot of character and that was originally powerd bu a 35 bhp Anzani 3-cylinder radial. It would be the perfect plane for doing slow circuits around the field showing off that beutiful engine of yours.

Here is a [link=http://www.sumo.in/watch.php?video=2562359]video[/link] showing the Eastbourne monoplane, unfortunately without a pilot in the cockpit and flown in a manner that doesn't reflect the performance of the protype, but it will give you an idea about what it looks like.

The hangar 9 hellcat has a HUGE cowl area that would perfectley fit your engine. It was even a little tail heavy with my mag .91.

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If you want to build a kit, search Tower or the auction sites for a Top Flite "Elder". It is an old fashioned looking monoplane. You will probably have to shorten the nose a tad, but, being a kit, that isn't really a problem.

Or, find a Super Sportster .60, butch the nose and mount her up.

A GP Big Stik .60 will work fine and can be had in ARF versions if you don't want to build.


Ed Cregger

Hi Ed and all,

Good suggestions. I like the idea of bashing a Sportster 60. I'll have to visualize what it would look like. Sure would sound nice!

Thanks.

Solstice

Interesting
http://www2.towerhobbies.com/cgi-bin...&I=LXBSB8&P=ML


I still think the hellcat would be a perfect match. My mag .91 4c over powers it for it being a warbird. I am running 14-7 3 bladed prop and she screams down the runway. I have had to add a little weight to the nose to get it balanced. If people can fit a zenoeh 20cc gasoline your radial 91 should be awesome
http://www.rcuniverse.com/magazine/a...article_id=773

You would be safe to figure that the 90R3 will be about the equivalent of the Saito .50 or maybe the .56. I have the 170R3 and it is universally accepted to have the power of a 1.20. Nice engine and let us know how you like it.

Maybe a sopwith camel or some other ww1 plane. or stearman

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Hmm, you may be right on the power output, Barry.

In that case, bash a Super Sportster .40 or Big Stik .40.

I've been thinking of putting my R3 1.70 on a model that looks as though it is made for an inline engine, but using a ring cowl instead. That would look neat. I should have bought one of those larger Super Sportster kits a while back, the .90 to 1.20 size. That would probably look great with the R3 up front. Sure would sound great - as we all know.


Ed Cregger

How 'bout a Hangar 9 Sopwith Camel?

http://www.hangar-9.com/Articles/Art...ArticleID=1692

Great info. I had thought of building a Midwest Super Stearman, but I think it will be too big and heavy for this engine. The Camel or Super Sportster sound nice. I see that folks are using glo assist, but I can't tell what brand people prefer. Or can I get by without glo assist? How do I start it anyway, three glo drivers?

Thanks for all the help. I"ll keep looking for everyone's comments.

I use two 8000 mah=16ooo mah 1.2 volt batteries ,and connect it to a collector..,and it is easiest to start when cold with an electric starter. I dont use any glo assist , i runs great without ,but it is then important to tune the low needle right (not to rich) and also the high speed needle to 200 rpm below absolute top rpm. I also use enya no.3 plugs . Thats how i do it
I fly it on a 60 size corsair from jamara with a total flying weight of 4 kg. It has enough power for this ,but does not however take very steep climbs.

Good luck!

I use a McDaniel's glow driver ( http://sonictronics.com/xcart/customer/home.php?cat=308 ). I set mine to come on at low throttle because I don't have any spare channels on my radio but it can be set to run on its own channel. Mine (I have 3 -- 2 in planes and 1 for the bench) have worked great for years. And they're ... how do I say this ... let's just use the word "resilient" ...

Get a NiCd with as high a capacity as you can.

Greg

I mounted the 90 radial on my seagull spacewalker II 40 size today, and it is actually a great combination ,flying just as good as it did with os 46 la. I cut 2" of the nose and it is balanced fine. it looks not to bad either ,like a stearman with one wing ...

I am building a Top Flite Gold Edition Corsair, I am putting the Robart 100 degree retracts and hope to have the weight under 9lbs Do you think the Saito FA-90 R3 would be big enough for this plane? Also if it would be what size 3 balde prop would you recomend?

I was toying with the idea of putting the 170r3 in but my standard cowling is about 3/4 of a inch too small, and not sure about the wieght this would add to the nose of the plane.

The 90R3 is not enough engine for this kit. The largest 4 stroke engine suggested is a 1.20, and the 170R3 will put out just about that amount of power. That is a lot of engine to have on such a long nose though. But, the 90R3 won't have enough power. Cutting some cooling openings in the cowl wouldn't be a bad idea for your radials, and would make life easier when tinkering around it at the field.

As a reference ,my corsair had a total flying weight of 4.0 kg(about 8lbs) ,it flew ok with the 90 r3 , 13x8 apc prop,but i would not had added much more weight on it. The space. 40 was better for the engine. The other thing with the corsair ,was that you had to fly with full throttle all the time ,and then the sound was`nt that great..
I also opened the cowl with c.flaps to provide cooling.

I had a feeling that the 90R3 would actually fly the model, and having to fly wide open all the time sounds right too. 4 kilos would be 8.4 lbs. Wolflord may be bumping closer to 9 lbs.

Buy another saito 90R3 and put them in a TopFlite, KMP, or Hangar 9 B-25. The power output of a saito 90R3 is closer to a saito .72, not a .56 as suggested by another poster. If you look at the specs, the motor can turn an apc 13x8 @ 8500 rpm's. The saito .56 cannot do that....its top prop size is a 12x8.

Using a little bit of math here, we can deduce the power output in general terms.
The 170R3 has been stated to be equivalent to a saito 1.20
The 1.20 has 2.2HP
The 170 is comprised of 3 .56 saitos. The .56 puts out .90 HP, so you'd think its doing 2.7HP, but, as a result of the inefficiency of multicylinder engines in model aspect size, you lose some power thus makign it similar to a 1.20
So, simple math:

2.2 ~~?percent
--- x ----------- = 81.48% power output of combine single cylinder outputs on a radial
2.7~~ 100

So, now we look at the saito 30 since the R3 is made of 3 of them
Power of saito .30 is .50 HP x 3 for a radial is 1.5HP
1.5HP x 81.48% gives 1.222HP

Now Horizon basically comfirms that the 90r3 can fly a .60 size radial warbird by stating its "maximum realism for .60 size radial warbirds". This means they have at least flown one .60 size radial warbird with this motor(but at there elevation of about 1000 ft above sea level...keep that part in mind)

It will fly a Hangar 9 Corsair or similar that weighs 8 pounds like has been stated by another poster. This also lends credibilty to the fact its putting out more power then a saito .56 because a saito .56 will NOT fly a .60 size bird without using 30% heli fuel and even then its marginal at best

I have had the 90TS twin and it did put out 1.2HP as advertised. The 90 radial will be about the same, however, in reality, might be doing more like 1.15HP

Thank you for the information. I'll figure out something. Not to many 60 sized planes can handle this much weight.

I am considering putting 2 Saito 90r3 in my TF B-25 arf. It calls for 2 OS 70FS engines in the manual!!

What do you guys think of this engine in a TF Gold Edition Sea Fury?

TF states in their manual that the plane will fly very well on the smaller engine in the range...