is the tigre 3250 enough engine for a 20 lb airplane?

like the top flight jug.

thanks

dan

Just to piggy back on this post, on average how many ounces of glow fuel do these consume for say 10 minutes of flight.

It would haul it around, but you may want to get ahold of the new 3750 they are supposed to be putting out soon. I had one in a 16# Yak and it flew okay with an APC 20X8 wide prop, pulling about 7250 rpm's on 5% PowerMaster fuel and a Perry pump regulator. I put an MDS 2.18 on the same plane and had unlimited performance.

I would think a Moki 2.10 would be even better, if you can find one. The are reported to pull 20X8W's at close to 8grand. My MDS 2.10 is pulling over 7800 with that prop. Supposed to be around 23# of thrust.

I would think that with the ST3250 your TWR would be about 1:1 with than engine. I am sure you will get some more opinions soon. Good luck, for the money the ST is a really good deal and a nice reliable engine, once you get it broke in and set up.

BTW, There is a terrific post here on RCU about setting these engines up. Following their recommendations, I have found them to be terrific engines.

If you stay at full throttle, they can suck up 24 ounces in about 8 minutes. Learned this from Dominator Racing. But who ever flies WFO with a warbird all the time. Too much chance of flutter. For normal sport flying and to keep the weight down an 18 ounce tank should be enough. If you have room you can mount a 24, but don't have to fill it up to save some flying weight. Good luck!!

Hmmm, 128oz in a gallon - 18oz per flight - 7 flights per gallon - $12 per gallon - $1.7 per flight
$500 for a gasser - $175 for a supertiger = $325 difference

325/1.7=191

191 flights to make up the cost of a gasser

Not to bad.

Big Super Tigres use low oil fuel so you can cut the $12 glow fuel (that has about 18% oil) with cheap straight methonal to get as low as 10% fuel. That'll drop the price further.
For a real bargain just look around for a used one. They're not hugely popular on the used market so normally go for a good price. You save the cost of the three gallons of fuel it (I've read) takes to break them in.

Thanks for the analogy Jeff, but I only pay about $10.00 for 5% Power Master and about $8.00 for FAI fuel, or can mix my own from local sources for about $5 - $6 a gallon. If you're made of money and not on a budget, the BME 50 or the new 55 would really be the engine of choice with it's easy mounting, light weight, and miserly fuel use.

Since I don't fly at full throttle any more with my big glow engines, I usually get tired of flying and land before fuel is all used up, ain't old age a #$%*#. Also, since we have been in Red Flag warnings through most of Texas, most of us quit flying our gassers for the time being, so as not to accidently start any grass fires around our grass fields.

Thank God for paved runways not too far away, for the really good days when I gotta fly the gasser and don't mind driving a ways to the pavement.

Anyway, hope we answered the original question good enough for our friend to make an informed decision, right???

i have found with the supertigres i have (3000) it seems to like 0% nitro and 18% oil. with the 0% it no longer tries to bite the hand that feeds it on hand proping. 10% seems to make it want to do that. i am flying one in a 1/4 scale fokker tripe (flair) and putting one in a proctor albratross (projected weight 22 lbs) like they were saying once broke in and carb tweeked it is a very nice strong running engine. i have heard that a o.s. carb also helps but i have not tried it

eagletree wrote: Have you tried reducing the oil content to approx. 12% (and no nitro)? I use that amount of oil for my STs and they work very nicely indeed. The lower oil content reduces oil residue and fuel cost to a minimum.

/Red B.

I can mix my own fuel for less tha $3 a gallon. I buy my alcohol from Duneland...about $2.50 a gallon and add Klotz oil. I got 6 Quarts of Klotz so that will mix a bunch!! Capt,n

Hello everyone,
http://members.cox.net/moorman1/Bigtigre.htm
That is a great link to someone, not me, who wrote an article about these engines. very helpful.
It looks like I will be getting a 3250 this weekend. I was wondering about this fuel mixing thing. I haven't done it before.
Can someone go over the basics. Where can I get what I need, How long can it sit, ect. Just getting into the big glow engines.

Thanks
Bryan

I run a number of big supre tigres, from the 2000 up to the big 6000 twin, I run all on home brew, 15% oil no nitro. I get mymethanol in bulk for aboput the cost of gas, so just the cost of oil to be added. I have found that even 10% nitro gives no real benefit power/performance wise, just blows more glo plugs. I run 4 stroke plugs with idle bar and all my st's have original carbys. These motors seem to take forever to run in, but do that right they seem to run forever and a day. one advantage with them is you have no ignition system to worry about, no extra battery switching etc, and set up right they will reliably start every time with a quick back flip. I love them, good solid reliable motors with plenty of power, and I have found that they work best propped up, i run 20 x 8 or20 x 10 on my 3000"s.

edited a booboo

don't you mean methanol in bulk?</p>

ooopsies     I did indeed,  thanks for the heads up    wlll edit