Mooney M20R Ovation, Mods

The trend at Mooney is toward bigger powerplants. Heres how the muscular Ovation stacks up against a modified 201.

Once prized for squeezing lots of knots out of relatively small engines, Mooneys are no longer taking a back seat in the horsepower race. The trend toward hot-rodding Mooneys is continuing, with the introduction of the Mooney Missile from Darwin Conrads Rocket Engineering, which consists of a large-block, normally aspirated engine stuffed into the Mooneys slick airframe. Rocket Engineering also does conversions to the 305 Rocket, in which a TSIO-520 is mated to an M20K airframe.

Not to be outdone by the aftermarket crowd, the Mooney factory rolled out its own high-horsepower act in 1994, in the form the M20R Ovation. Both of these aircraft represent essentially re-engining of existing airframes. Darwins Missile transplants the Mooney 201s stock IO-360 with Continentals IO-550 rated at 300 horsepower; the Ovation uses another variant of the same engine, derated to 280 horsepower.

Another big-bore mod was under development when the Missile came out, the GTO from LoPresti Speed Merchants, but it did not come to fruition. Nevertheless, buyers have the choice of three high-horsepower Mooneys, all with similar performance but with operating characteristics quite different from those of the turbocharged engines traditionally associated with go-fast airplanes.

Turbos dead?
Does the trend toward large-displacement, normally aspirated engines mean that the turbocharger has seen its day? Hardly. Both Rocket and Mooney say that the new models simply give buyers the option of high performance without turbocharging. The Missile is based in large part on the 305 Rocket mod that has been successful for Rocket. Rockets Conrad notes that this is our answer for the pilot who wants a faster Mooney, but doesnt care to spend the extra money for the Rocket or already has a 201 and wants to improve its performance without the expense of a turbo.

The Ovation, which carries a much higher price tag than the Missile, probably wont compete directly with the modified model; rather it should appeal to the buyer who seeks near 200-knot performance without dragging the airplane into the flight levels. The Ovation is essentially a TLS airframe with everything new from the firewall forward. Jeff Dunbar, Mooneys sales VP, explained that the Ovation fills out the Mooney line perfectly, fitting in between the MSE (M20J) and the TLS (M20M) in both performance and price.

Missile motivation
For the Missile, Rocket Engineering uses the same engine configuration as found in the A-36 Bonanza, producing 300 horsepower at full throttle. The engine installation is virtually identical to the Rockets, replacing the original four-point Mooney engine mount with Rockets eight-point mount. The Missiles engine, like the Rockets, is canted 2-1/2 degrees to the right and 1/2 degree down to offset torque effects. Conrad retained the heavy-wall, stainless steel exhaust with a flanged exhaust tube replacing the turbo controller and a hefty muffler with heater muff replacing the turbo, suggesting that adding a turbo down the line would be a cinch.

Theres no way that big Continental would fit under the same cowl as the stock Lycoming, so the Missile has a modified cowling from a Mooney 231, with different baffling, no air induction inlet for the non-existent turbo and no cowl flaps. As on the Rocket, the cowl is cut down at the front to clear the spinner, a slight bulge is added to the left forward upper corner of the lower cowl to clear the number six cylinder and a large oil access door is added. The engine is mated to a 75-inch Hartzell Scimitar three-bladed, full-feathering prop. The feathering prop proved popular on the Rocket and Conrad pushes it as a safety feature.

Firewall back
Aft of the firewall, there are few changes to the Missiles cockpit. A mechanical tachometer replaces the original electronic type and a digital fuel flow gauge is required, if one isnt already in the panel. Owners whose aircraft are equipped with a push/pull throttle can opt for a vernier control during conversion and wed suggest that as money well spent. The ram air and cowl flap knobs arent connected but Conrad leaves them in place, leaving open the option to add ram air later.

A new slide-in aluminum battery box fitted with two 12-volt, 35-amp batteries is installed in the tail cone, helping to counterbalance the big engine up front. Actual installed weight of the engine and accouterments adds 250 pounds. Rocket welds in 11 structural pieces to upgrade the M20J to M20K structural specs, allowing a gross weight of 2997 pounds, up from 2740 pounds in the original 201. The net impact of the conversion is an eight pound gain in useful load.

Earlier models (1977-1980) with square wingtips require installation of the tapered 231-style tips with integrated lighting. Likewise, models earlier than 1981 must comply with SB 1720-220, which calls for a fuselage tubular structural clamp to reinforce the longerons. Many buyers are likely to opt for installing the STCed Monroy auxiliary fuel tanks which add an extra 35.5 gallons (30 gallons if speed brake equipped) to the original 64-gallon capacity.

Flying the Missile
We flew the first certified Missile only hours after it had been signed off and the Experimental placard removed. Taxiing out at Spokanes Felts Field, the airplane handled much like any stock M20. With the Missile lined up and throttle firewalled, launch seems the operative word. Acceleration was rapid and pronounced and we were off in about 1000 feet, as claimed. With full tanks and equipment, we were about 200 pounds under gross. Initial rate of climb was 1500 feet per minute, which correlates with Rockets claim of 1550 feet per minute at sea level and gross weight.

The canted engine reduces P-factor effect to next to nothing and its possible to climb at full power with feet on the floor and the ball only slightly off center. The right rudder required feels to be about the same, perhaps even a bit less, than the original 201. Lowering the nose slightly for a better view reduced the rate of climb to about 1100 feet per minute. This bled off to about 1000 feet per minute at around 6000 feet and about 800 at 10,000 feet. We continued to 17,500 feet, where climb rate was still better than 200 feet per minute. Despite the lack of cowl flaps, the temps never got out of the lower part of the green.

Conrad claims a top speed and max cruise of 193 knots at 8000 feet. Our flight verified that as attainable. Conrad explained that he had hoped to see 200 knots in the Missile and that this speed may be reachable with ram air added. Our speeds and fuel flows jibed closely with the charts we were given. Pilots can expect better than 185 knots from 4000 feet through 14,000 feet, with fuel flows ranging from 16 gallons to as low to 11.8 gallons at altitude. At 17,500 feet, we saw 179 knots true, carrying 15 inches and 2500 rpm for a fuel flow of 10.7 gallons. By comparison, at 10,000 feet, 55 percent power will yield 170 knots. Noise levels are reasonable at full power and the cabin seems quite quiet in cruise.

Conrad suggested we try out the feathering prop so we established ourselves over an airfield and proceeded to slowly reduce power and allow the engine to cool down. With the mixture at idle cutoff, it took a hefty pull on the prop control to get the prop to feather, after which it stopped dead. The improved glide ratio is noticeable. A stock 201 with a stopped prop has a respectable 12 to 1 glide ratio; the feathered prop increases that to 16 to 1, an improvement that could make a difference in a genuine engine-out situation. Following the glide test, we were happy to restart the engine to try a series of stalls, and minimum controllable air speed exercises. We found no unusual behavior; just typical, predictable Mooney performance. Landings were also straightforward, with no discernible difference from the stock 201. So, what you have here is an honest, 190-knot airplane. Beyond that, its the same M20J Mooney you started with, for better or worse. While the Missile conversion will give you a big, shiny new engine and lots better than new performance, it doesnt make it a brand new aircraft.

New Ovation
For new all around, the Ovation is waiting, albeit at significantly higher cost. Mooneys version of the IO-550, the G model, features a tuned induction system, similar to the one incorporated on the 252. A 73-inch diameter McCauley three-bladed prop turns the horsepower into motive force. Mooneys Dunbar said that much effort went into the induction system to achieve even fuel distribution with ram air recovery totaling 1 to 1.5 inches.

The G-model has no altitude-compensating fuel metering, so the pilot must lean the mixture manually above 3000 feet MSL in the climb. To facilitate this, the EGT gauge is marked, in blue, with a climb range from 1400 to 1450 degrees. Dunbar claimed this was done to reduce complexity and to allow more precise fuel management. Were not sure this isnt a step backwards.

Mooney derated the IO-550G to 280 horsepower by limiting maximum RPM to 2500. This probably contributes to the engines claimed 2000-hour TBO. Whether thats a realistic number wont be known until the aircraft accumulates some history, so buyers are duly cautioned not to bank on the high TBO. Dunbar said the power was limited primarily to reduce noise. However, we were told that theres another good reason for limiting engine output: Higher horsepower might have made it difficult to meet certification requirements during stalls.

The most noticeable difference on the Ovation exterior is a new sculpted cowl which slopes down to the pair of the small cooling inlets which seem the rage these days. These inlets are smaller even than those on the MSE but they still manage to provide adequate airflow. No cowl flaps are fitted so cooling air exhausts around the dual exhaust pipes.

Not your fathers Mooney
The interior belies Mooneys reputation for cramped and uncomfortable cockpits. The extended fuselage, which the Ovation shares with the TLS, makes a big difference. Mooney consigned the chintzy plastic interior panels from prior models to the waste heap. All interior panels on the Ovation (and TLS) are now a laminated composite material with very nice natural wool cloth or synthetic material coverings. This really upgrades the cabins looks, in keeping with the contemporary, upper-end tenor of the new aircraft. The composite panels also reportedly do a better job attenuating sound than the thin plastic they replace.

The instrument panels lower edge has been raised slightly, offering more leg and knee room. The panel itself is painted light gray with screen-printed placards, giving an appearance thats consistent with an airplane in this price range. The prototype we flew was reasonably well equipped with Stormscope and GPS, but no GEM or engine monitor of any sort. There was plenty of room for either, and we would expect most owners would, and should, opt for monitoring of some kind.

Exterior lighting switches are on the overhead and it takes a compliment of six, two of them split switches. Mooney, to their credit, makes sure everyone has the best possible chance of seeing you coming. Inside are the traditional map lights under the yokes, area lighting in the glare shield and individual adjustable lights for each seat in the overhead.

Standby vacuum is standard, as are dual 24-volt batteries (located in the tailcone for balance considerations). A rocker switch toggles from one battery to the other. Either can be used for all operations and they can be switched at any time, but they cannot be used at the same time. It isnt a dual buss system, just dual batteries. With no second alternator offered, the dual batteries at least give you ample standby reserve in case of an alternator failure.

Mooney got rid of the storage bin which used to be affixed to the nose wheel enclosure below the power quadrant and this small change makes a world of difference in apparent cockpit size. It makes getting in and out of the pilots seat easier, too. Both front seats adjust every which way a pilot might want and are as comfortable as in any production aircraft weve seen. Still, the seating position is classic Mooney; you sit low with your legs straight out in front. It takes some getting used to. The difference the longer fuselage makes is most obvious in the rear seats, which are considerably improved over the torture devices they simulate in the short-fuselage Mooneys.

The prototype, which we looked at, had a reasonable useful load of 1050 pounds and was probably equipped much as the average buyer will order the aircraft. Add EFIS, a built-in oxygen system, de-ice equipment and youd eat into that figure. The Ovation carries 89 gallons of fuel so the pilot has the choice of long legs with two aboard or shorter flights with four people and baggage.

Opening Ovation
In its striking Lone Star paint scheme, the Ovation prototype was impossible to miss on the ramp in Tucson, where we flew it. The long fuselage and sculpted nose make it the prettiest Mooney yet, at least to our eyes. It was early and the outside temperature was still in the 70s when we departed Tucson. Tanks were just under half full from Dunbars flight in the night before from Kerrville. With his luggage and our survival equipment, we were still about 300 pounds below gross. Takeoff roll was brisk, but initial acceleration didnt seem as rapid as that of the Missile. With the trim set for takeoff, the Ovation flew itself off at about 65 knots. The Ovations standard electric rudder trim is welcome for climbout, even with an engine canted at 2 degrees to ease the strain.

At cruise climb (120 knots) we maintained better than 1000 feet per minute up to 9000 feet, where the climb rate started to sag a bit. The airplane seems happiest in the 10,000- to 12,000-foot range and settled in for about 187 knots cruise at 12,500, consuming 15 gallons per hour. Reducing the power back to 2400 RPM resulted in 175 knots and 11.5 gallons. We didnt climb any higher because there was no oxygen on board, but the factory claims 175 knots on 11.3 gallons at 17,500 feet and that seems plausible.

The engine runs smooth as silk with nary a vibration, quite a contrast from the TLS. Its also quiet. Even without headsets it was possible to carry on a conversation without undo strain. The standard electric speed brakes make coming down from high cruise a breeze. Again, slow flight, stalls and landings were what youd expect from a Mooney. No surprises, although the sight picture over the sloped cowl takes getting used to, thus our first landings were on the firm side.

Engine cooling
Flying in Tucson in high summer proved a rigorous test for both cabin ventilation and engine cooling. Cabin air flow is adequate from the floor, side panel and overhead vents, but at 105 degrees plus on the ramp, the need for air conditioning was made obvious by the sweat trickling down my nose. Air conditioning in a new model is a $20,000 option, but in some parts of the country buyers will probably consider it necessary.

After our initial flight, we stopped for a cold drink and gave that tightly cowled engine plenty of time to heat soak. It started right up, stumbling briefly as gas vapor cleared the line. A long taxi and ground hold added to the heat gain. Temperatures approached about a needles width of redline, but never exceeded the redline. As we climbed out, the temps stayed up, but gradually started down once we established a cruise climb. Only experience (and a hotter day) will tell if the lack of cowl flaps was a good idea. Our initial experience on a warm day seems promising, though.

The Missile and Ovation offer similar performance but, as we said, will likely appeal to very different buyers. The Ovation offers flexibility with the ample useful load and large tanks. The Missile isnt too far behind if the Monroy tanks are fitted but it loses a bit to the Ovation in useful load. Either is capable of 185 knots or better in cruise, or you can slow down 10 to 15 knots to stretch the range while still perking along at a speed far greater than most singles will deliver. In that sense, the big-engined Mooneys are more flexible than a stock 201 or even the turbocharged versions.

The biggest difference, of course, is the price tag. At $64,900 installed for a conversion using a factory remanufactured engine, the Missile allows a 201 owner who likes his plane to add lots more performance without going to turbocharging. If the conversion is done at overhaul time, the price is somewhat less daunting.

With a decent overhaul of the original going for about $17,500 fly away cost, the balance is $41,500 to upgrade to a Missile. Add $5,300 to $6,000 for the long range tanks, if not fitted. We wouldnt call that cheap but surveying the market for a recent vintage single of comparable speed, economy and flexibility, the Missile conversion stands out as a competitive choice. (Admittedly, a Bonanza or Cessna 210 aficionado might argue the point.)

A new Ovation has a 2001 base price of $418,000, which gets you a fairly well-equipped ride. The earliest models are currently going for $267,000.

For a comparably equipped aircraft, the new price is better than $70,000 more than a new Eagle and $60,000 less than a TLS.

Predicting how either airplane will weather depreciation is all but impossible. Traditionally, most go-fast engine swaps have not retained over time much of their initial added incremental cost. On the other hand, the 305 Rocket seems to be holding its value relatively well for now but future values are subject to the vagaries of the market.

We think owners should expect any mod to depreciate somewhat like a new aircraft and not be surprised by a relatively steep drop in value after a few hours are on the tach. This mod is not something to consider unless you plan on keeping the airplane for a while.

How well the new Ovation holds its value is a question without an answer at the moment; four years of depreciation isnt enough to establish a trend. The TLS hasnt done as well in the used market as some early buyers would have hoped. But we see the Ovation as having the potential for better performance due to the proven engine combined with the desirable airframe. Still, expect a precipitous drop, as with all new aircraft. Its only a matter of degree.

By the way, Mooney has not been kind to the aftermarket mods implying that the supplemental type certificate process under which theyre approved is somehow inferior to the factorys full TC certification. On at least a half dozen occasions Dunbar made remarks denigrating modified STCed aircraft despite the fact that Mooney has itself installed a number of options on new Mooneys which are not TCed, but rather STCed. As noted in our article, Mooneys Rocket Attack (see Aviation Consumer, September 1993), theres no evidence to suggest that a mod or improved design approved under an STC is any less safe, generically, than those done by the factory with a TC.

In our view, both the Missile and Ovation are fine airplanes in their own right which seem well positioned for their intended markets which, as we said, are quite different. They are both a pleasure to fly and their pilots will likely love the capabilities, performance and flexibility they offer.

More than anything else, the decision between a new aircraft or one of the mods is likely to be based on the thickness of the owners wallet.

Also With This Article
Click here to view charts for Resale Values, Payload Compared and Prices Compared.
Click here to view the Mooney M20R Ovation features guide.
Click here to view “The Lure of The Big-Bore Engine.”