Thunder Tiger engines

Lenonard- You mentioned in the previous message that you were doing the TT engines, but these are not listed in your prices for various engines. What is the price for a .36? Also, do these have the same dimensions as the Aerotiger offered by Aero Products? I have a Cavalier that was set up for one of these, but have been unable to get one. (it's been 7 months since I ordered it)

Same dimensions because it is the same outer engine. The needle location is the same, as is the outer dimension of the venturi. I haven't added these to the web page yet, but will shortly, along with the 42, 46, and (maybe) a new 50.

Randy adds a new, custom, aluminum sleeve to his. I stick with the stock Brass sleeve. So mine will be a bit heavier. Still, it is 2/10 of an ounce lighter than the 35 FP. Randy, also, replaces the bearings, while I will be sticking with the stock bearings. Randy's will be made to go faster, while mine will turn a bigger prop. His will be better quality with the new (lighter) sleeve and bearings, but it will cost twice as much. I have been wrestling with price and decided to go with $125. I haven't had a chance to work out best props yet, but plan to do some more field testing this spring. It should be very similar in capability to what we were doing with the 35 FP. These fit the Fox 35 mounts, by the way, but have a half inch longer shaft.

The 42 I am selling for the same price as the FP--$105.00. It is a drop in fit for the FP except for a slight change in needle location.

As I said, I will get more information up on thw web shortly. I am having trouble getting caught up with what I presently have in the shop, so haven't ruxhed to promote the new stuff.

Len- Do you have any of the 36 TT eng. available now? Also, it would be interesting to see some more details about the others- running characteristics, weights, etc. I might as well go ahead and get one of the .36's now-the plane has been ready for months.

I have all of the following engines in stock, except for the 35 FP, but have scrounged a couple of those for future stock. Weights are as follows, converted with Delrin venturi and appropriate needle valve assembly, but without glow plug and without weighing the muffler:

Thunder Tiger 25 GP = 172 grams, 6.06 ounces.
Thunder Tiger 35 Pro (ball bearing) = 230 grams, 8.11 ounces.
OS 35 FP = 237 grams, 8.36 ounces.
Tower 40 (FP clone) = 234 grams, 8.25 ounces.
Thunder Tiger .42 = 245 grams, 8.64 ounces.
(same case size and mounting as FP)
Thunder Tiger 46 Pro (ball bearing) = 315 grams, 11.11 ounces.
By comparison, the Magnum .53 weighed 10.7 ounces.

For all of these we have or will have tongue mufflers available that weigh 1/2 ounce or less (3/10 ounce for the .25)

They all are modified in a similar fashion and seem to like about a 5.5 pitch prop. For some (BY&O) a 6 pitch works well. For others (Top Flite, Zinger, APC) a 5 pitch might work better.

As with any engine, you need to adjust the prop to desired lap speed, line length, etc. I tend to encourage longer line length than "normal" for these size engines, since they will develop greater than normal power for their size.