One of my rule of thumbs is if I cant taxi with the plane flipping over its too windy. I usually fly at a buddy's home field and its usually just 2 or 3 of us so never more than one plane in the air at a time. Runway points north south so we usually have a bit of a cross breeze. But Pilot can pick which way he wants to take off, but regardless you have to turn the plane to line up. If the wind causes the plane to tip over when I make my turn to line up its generally too windy.

But I also got a very good baptism in fire when it comes to the wind. My the first 2 days of my buddyboxing were quite windy so I got very use to the wind and gusts, my first day up was probably steady 10 mph winds with gusts in the 20-30 range. And as my first time up you learn how to fly the wind well. if you only fly on calm days it can be a shocker how much the wind can toss even heavier 40 size planes around. But the bigger you go the better the plane will fly in the wind. I only had 1 mishap from the wind my second time flying after solo. set in for alanding approach too slow and got hit with a gust cross breeze. because my trainer still had dehedrial in the wing it picked one wing right up and flipped it over in the air 20 ft above the run way. I was going to slow to abort and it piledrived in. after repairing the trainer (and removing the dehedrial) Ive learned how to fly into landings with alittle more power than gliding in when its windy out.

So really no one is the judge but you. we all probably have our own rules of thumb about when its TOO windy. But if your not afraid of a challenge and live some where like me where its a blessing if the winds under 8mph you just gotta learn to live with it and learn to fly in it, otherwise you'll be grounded more often than not. Its nature we have no control over it.

And btw you said you flew your trojan in 25 mph winds, thats the pz foamie right? Probably not more than 3 lbs at flight weight, that thing will get tossed around by the wind much more noticably than a 40 + size nitro plane. weight and speed are your weapon against the wind. just learn from my mistake when its windy you gotta land with alittle more authority. when its calm ill put my planes at idle and glide in. when its windy i'll usually bump the throttle up a few clicks and fly the plane in to the ground, It can be alittle more nerve racking but very satisfying when you grease a landing with a stiff cross breeze!