Thorp Air Command - T18.net

Hey everyone, my dad and I are really interested in building an aluminium home built, but how does a thorp stack up to say, a vans aircraft in terms of build difficulty and flight performance(the numbers are pretty similar, but I want to know about the feel)?
Is the extra build time and effort worth the end product? or would it be best to spend the extra money on a kit? (considering that we don't have a great deal of experience in building aeroplanes)
thanks guys

If you close to Kentucky Dam, there is a Thorp gathering next month. You can get a lot of your questions answered.


*** admin posted for Bill Williams ***

_________________
Forum Administrator

Looks like you're from down under ... probably not in the neighborhood of KY Dam.

The Florida dynamic duo has built an RV-7A (and sold it before the paint was dry from what I understand).

Perhaps they'd be kind enough to shed some light on the apples to oranges comparison.

As far as "feel" goes ... I personally think the T-18 is the best flying airplane I've ever been in. It was designed by a real aeronautical engineer and it shows. No disrespect to the "other" homebuilts but my recent flight experience in an RV-8 put a huge grin on my face that I had a T-18.

_________________
Lee Walton
Houston, TX
N51863,N118LW
KEFD

I will attempt to give an unbiased opinion on the T/S-18 and the RV series.

I have just returned from a breakfast flight in my T-18 with S-18 wings. As always, it lept into the air with two aboard and promply cruise climbed to 2,000 agl at about 1,000 ft/min. We leveled off and with 24 squared power, indicated 187 mph. After a fine airport breakfast on the seaside in Venice, Florida, proceded back to LAL. I decided to push it up at 1000 ft msl and got just over 200 mph (two aboard, hot day, full internal fuel). I have easily broken the red-line of 214 mph straight and level (autopilot on a cool day, solo).

With a roll rate of 180 degrees per second, light aerobatics are a joy in the Thorp. While not a great soft field plane, you can get it in and out of a short sod strip without too much pucker factor.

Contrasted with the RV series, you will find the RVs have about 120 degree per second roll rate with a decided ratcheting effect with full deflection. The RVs must be flown all the time as they exhibit neutral ailron feel much like a helicopter. Some are better than others depending on the trim spring tension. The Thorp just sits there like a 40# robin.

As far as speed is concerned, they are about even with a lot depending on weight and trim. The tandem RVs are a bit faster due less flat plate area, given the same power and prop selection.

Pitch moments in the RVs can vary widely with CG. The RV-6 is particularly pitch sensitive. The RV-7 is more mild mannered due to a longer tail arm and the -8 flies well if you mind the balance with two aboard. It is a totally different plane with two aboard. The -9 is again, a different plane as it was designed with a docile airfoil.

The Thorp has the edge in ground handling as you can easily see over the nose in the three point attitude, which you can't in the taildragger RVs. the nose roller RVs are OK on the ground except for the excessive braking required to steer, especially in a cross wind. Takeoff in the nose rollers, particularly in the RV-7 can be tricky as the ground attitude yields a negative angle of attack. This causes the nose to pop over center at lift-off and can cause a high pitch up at lift off if you are not ready. Most of us use full aft stick from the beginning of the take off roll blending it out as the tail becomes effective.

The RVs have more room and more fuel (you need to switch tanks as you burn off). The T/S-18 has more baggage capacity and a more tolerant CG range.

In the final anaysis, I have owned a T-18 and an RV-7. I still have the T-18.

_________________
Bob Highley
N711SH
SN 835
KLAL

Have you done any Infomercials on late nite TV ? I think I bought a Dice-a-Matic from you ![8D]

RB