Yak 9 motor

[steven yampolsky]

Mike's Yak 9 plans show Silver Fox 40 as the base motor. Having never seen or heard of such motor I am trying to figure out what kind of motor would be equivalent in terms of power and weight. Can anyone educate me on what kind of motor Silver Fox was.

[Avaiojet]

Steve,

Fox is still in business, you could give them a call.

I've never paid any attention to the engine which is drawn into the plans, especially if the plans are old plans.

My guess is that Yak 9, like all other model airplanes, based on the model's weight and wing area, plenty of engine choices would be available.

I wouldn't view it as a Yak 9. I would just view it as another model that has weight and squares.

What engines do you have in the .40 size?

Charles

[Bill Little]

HI Steven,

The "Silver Foxx .40"  (yes two xx) are banjo case Fox .40s reworked by Lew Wollard.  Pretty strong stunt .40.  I would say an Aero Tiger .36 would give comparable power, since it seems to be the strongest of the ".36" size engines available.  A saffe bet would be the ever present OS .46LA.  The original model built by Mr. Quek (no "c") was powered by a Merco .35 Red Head.

An alternative would be a ST .46.  I intend to use an Aero Tiger .36.

BIG Bear
RNMM/AMM

[steven yampolsky]

HI Steven,

The "Silver Foxx .40"  (yes two xx) are banjo case Fox .40s reworked by Lew Wollard.  Pretty strong stunt .40.  I would say an Aero Tiger .36 would give comparable power, since it seems to be the strongest of the ".36" size engines available.  A saffe bet would be the ever present OS .46LA.  The original model built by Mr. Quek (no "c") was powered by a Merco .35 Red Head.

An alternative would be a ST .46.  I intend to use an Aero Tiger .36.

BIG Bear
RNMM/AMM

ST46 and AT36 are pretty far apart weight wise. How much does Silver Foxx weigh?

[Bill Little]

ST46 and AT36 are pretty far apart weight wise. How much does Silver Foxx weigh?

HI Steven,

I am not sure what the banjo backplate Fox .40s weigh.  But it is more than the unmuffled Merco .35 Red Head (as is the AT .36) so everything is a moot point on engine weight as far as "modern" engines go.  I don't believe that it is a "critical" point since Billy has gone to ST .46s and then AT .36s in his Ares, Vulcan, etc., (all being unmuffled Fox .35 originals) and won Classic at the NATS and VSC with them.

BIG Bear
RNMM/AMM

[peabody]

Steve....
The Fox's engine bearers are quite a but farther apart that either the AT .36 or the ST .46.......and the Fox is considerably heavier....the AT and ST are pretty close, I believe, weight wise.
BTW...I have both a NEW AT.36 and a great ST.46 on sale at the auction site!

Have fun!

[Mike Griffin]

Steve when I get to the point where I can finish my own YAK9, I am going to use one of Randy's OS.46 LA's.  Dont know if this helps you or not...

Mike

[Bill Little]

Steve when I get to the point where I can finish my own YAK9, I am going to use one of Randy's OS.46 LA's.  Dont know if this helps you or not...

Mike

Hi Mike,

That should be a very good choice for the Yak9!

BIG Bear
RNMM/AMM

[peabody]

I have a BRAND NEW OS .46 for sale in the classifieds as well!

[proparc]

Because of my "Tim Allen" problem, I would be looking to use a Stalker 51,or something close.

[Balsa Butcher]

I was just running a Silver Foxx 40 today. Bill has it right, banjo rear case, runs 4x2. Mine has many miles on it and has lost a lot of its mojo. I would go with an LA-46 if I were to build a Yak 9. For the record...the Silver Foxx 40 has the same engine bearer spacing and bolt pattern as the ST-46 and the Enya 45 6001. I have used them all interchangeably in this model (my test mule, a Dixon "Stylus"). Next engine I will be testing on it will be a PA-40 ultra light...which would be a good choice for this model as well, power would not be a problem.

[steven yampolsky]

be a PA-40 ultra light...which would be a good choice for this model as well, power would not be a problem.

Now we are talking!!!!!

[Gerald Schamp]

I have two Stalker .51 RE engines that I would part with, one is brand new and the other is bench run, has about 30 minutes on it. Have props as well. Email me if you are interested.

Thanks,
Gerald Schamp

[proparc]

Next engine I will be testing on it will be a PA-40 ultra light...which would be a good choice for this model as well, power would not be a problem.

I would skip all the rest and head right here!!

[Gordan Delaney]

   


          If we are talking Sterling Yak-9  I would recomend a foster Fox .35.  The Yak is a small plane and the bigger engines are heavy. The Fox .35 flew in my Ringmaser was very adequate and relaible----and the plane was easy to balance. A 10x6 or 5 prop is good. The model has a small wing and I would caution not to try to fly the plane too slowly.

                                                        Cheers,
                                                                        Bart

[Bill Little]

   


          If we are talking Sterling Yak-9  I would recomend a foster Fox .35.  The Yak is a small plane and the bigger engines are heavy. The Fox .35 flew in my Ringmaser was very adequate and relaible----and the plane was easy to balance. A 10x6 or 5 prop is good. The model has a small wing and I would caution not to try to fly the plane too slowly.

                                                        Cheers,
                                                                        Bart

HI Bart,

Actually this is the Yak 9 that Mike Griffen put out recently.  Beautiful laser cut kit, BTW!

It is ~54" WS and originally used a Merco .35 Red Head.  Mid '60s vintage Classic legal stunter from Britain designed by Mr. H.C. Quek and published in Aeromodeler.

I hope you are well!
Bill

[Bill Hummel]

Looks like I will go with a trusty old ST 46. Carry on, prehistoric stunt!

[steven yampolsky]

HI Bart,

Actually this is the Yak 9 that Mike Griffen put out recently.  Beautiful laser cut kit, BTW!

It is ~54" WS and originally used a Merco .35 Red Head.  Mid '60s vintage Classic legal stunter from Britain designed by Mr. H.C. Quek and published in Aeromodeler.

I hope you are well!
Bill

I did some thinking and decided to go with B40. From dimensions, it looks like Yak-9 is the same size as the VanLoo's Chipmunk from Walter Umland. I've had the Chip for over 7 years now. It's been powered by the same B40(150+ flights on it and the sleeve bearing is starting to give up, time for a rebuild). Those who know me, think I'm nuts because when the winds come up and everyone packs it in, I head out. Fact of the matter is, B40 is plenty powerful to pull a 580sq in. 46oz airframe through pretty much anything.  

Plasma ST46 sounds soooooo enticing.... It's calling to me "Steve, I can fly on full synthetic. Easy cleanup, cleanup, cleanup, cleanup...."

[Steve Thomas]

I've been intending to use a nice Enya 35-III in mine - all this talk of .46s and .51s is making me feel a bit inadequate! 

[proparc]

I've been intending to use a nice Enya 35-III in mine - all this talk of .46s and .51s is making me feel a bit inadequate!  

 

[steven yampolsky]

I've been intending to use a nice Enya 35-III in mine - all this talk of .46s and .51s is making me feel a bit inadequate! 

That's just un-American! It is our right, nay, our duty to stuff ridiculous amounts of power in super small cars/planes/models. If you are not putting a PA75 in that thing, you are not a patriot! 

[Steve Thomas]

If you are not putting a PA75 in that thing, you are not a patriot! 

A true patriot shouldn't be building a goddamn commie airplane with red stars all over it anyway. 

(besides which I'm un-American by definition  )

[Bill Little]

I did some thinking and decided to go with B40. From dimensions, it looks like Yak-9 is the same size as the VanLoo's Chipmunk from Walter Umland. I've had the Chip for over 7 years now. It's been powered by the same B40(150+ flights on it and the sleeve bearing is starting to give up, time for a rebuild). Those who know me, think I'm nuts because when the winds come up and everyone packs it in, I head out. Fact of the matter is, B40 is plenty powerful to pull a 580sq in. 46oz airframe through pretty much anything.  

Plasma ST46 sounds soooooo enticing.... It's calling to me "Steve, I can fly on full synthetic. Easy cleanup, cleanup, cleanup, cleanup...."

Hi Steven,

I have some choices....... the ever present Aero Tiger .36, a Tom Lay ST .46, a Big Jim Hemi ST .40 several ST G.51 (all reworks).......  I could even go with the Brodak .40 or "little" Magnum .36XLS.  BUT, since this is a verified Classic ship, I will probably go with one of the ST .40 or .46..................  or..................



BIG Bear
RNMM/AMM