raisbeck learjet 60 aft fuselage locker · luggage and cargo! the forward compartment is 8 feet...

Raisbeck Lear 60 Aft Fuselage Locker – Program Pamphlet Ver. 072314-9

Raisbeck Learjet 60Aft Fuselage Locker

Program Pamphletprepared by the Raisbeck Engineers


Learjet 60 Aft Fuselage Locker – Program Pamphlet

Table of Contents

1. General Description A. The Locker’s Purpose B. Dimensions and Weights C. Pictorial Summary

2. Typical Loading Examples A. Example Descriptions B. Gross Weight-CG Examples for Airplanes Without an APU 1. 8 Passengers and Baggage 2. 4 Passengers and Baggage 3. Ferry Flight – No baggage

C. Gross Weight-CG examples for Airplanes with an APU 1. 8 Passengers and Baggage 2. 4 Passengers and Baggage 3. Ferry Flight – No Baggage

3. Economic Considerations A. Possible Ballast Installations B. Fuel Consumption Considerations C. Resale Implications

4. Frequently Asked Questions (FAQs)

5. Executive Summary


1. General DescriPtion a. Purpose of the aft Fuselage locker (aFl)

The Learjet 60 is a fast, longer-range, nine-passenger airplane with remarkable operational efficiencies. Its only real deficiency is its available luggage space. When accommodating more than four passengers, ever-increasing compromise comes from loading luggage in the passenger seating area, or sending that luggage by commercial carrier to the Lear 60’s destination. Neither of these options is attractive to the operator.

Raisbeck Engineering’s Aft Fuselage Locker (AFL) provides an additional 28 cubic feet of external uncom-promised baggage space under the airplane’s upswept aft fuselage. It also offers a measurable decrease in drag due to its streamlined shape and reduced trim drag from the aft shift of the CG. With minimal maintenance and ease of loading, the Raisbeck AFL for the Lear 60 is currently the only available solution for increased cargo space and efficiency for the Lear 60. The AFL returns the full use of the cabin to your passengers.

B. the locker’s Dimensions and Weights The Aft Fuselage Locker has two separate but connected compartments that comprise 12 feet of length in

all. It provides 28 cubic feet of waterproof space outside the cabin and the ability to carry 210 pounds of luggage and cargo!

The forward compartment is 8 feet long; the aft compartment is 4 feet. Both compartments conveniently allow for the separation of passenger luggage and aircraft equipment if desired.

• Overallluggagecompartmentlength–12feet• Forwardcompartmentlength–8feet• Aftcompartmentlength–4feet• Internalspace–28cubicfeetofinternalspace• Installedweight–276pounds• Internalcapacity–210poundsofluggageandcargo

22 ft

8 ft

4 ft

12 ft

The aerodynamic clean lines are preserved with forward and aft fairings, both of which blend seamlessly into the linesofthefuselage.Overalllengthofthelockerwithits fairings is 22 feet long.


c. Pictorial summary

The overall clean lines of the Aft Fuselage Locker are apparent.

The three baggage/cargo doors open outward simultaneously for easy access.


c. Pictorial summary - continued

The original aft cargo door is retained, as is the original maintenance door. Full access is available for all four doors to be open at the same time if necessary.

Close-up of the new AFL storage space with doors open show an additional 28 cubic feet storage.


3. tyPical loaDinG examPles

a. Description of the examples

Sometypicalloadingexamplesareprovidedtoenabledirectcomparisonoftheaircraft’sGrossWeight–CGenvelopewithandwithouttheAFL.Whiletheairplane’semptyweightincreasesby276pounds,maximumrange is generally not compromised since drag reduction carries most of the increased empty weight, and in most instances, aft ballast is no longer needed.

Two sets of comparisons are shown; one set for airplanes without an APU, and the other for APU-equipped airplanes. Loading examples are designed to bracket missions with 8, 4, and 0 passengers (ferry flights). Normal climb and cruise are not changed, so fuel on board is the measure of range.

Passengers and crew are assumed to weigh 185 pounds each, and each passenger has 30 pounds of lug-gage. Luggage is loaded in each case to minimize the requirement for ballast.

In cases where ballast is needed to achieve maximum fuel capacity, it is positioned so that the least amount of weight is used.

B. loading examples for airplanes without an aPU (with and without the aFl)

LOADING FOR A/C WITHOUT AN APU

CONCLUSION: • No Aft Ballast Required• No Forward Ballast Required Except for Full Fuel Ferry Flights

With AFLBaseline


c. loading examples for airplanes with an aPU (with and without the aFl)

LOADING FOR A/C WITH AN APU

CONCLUSION: • No Aft Ballast Required• No Forward Ballast Required Except for Full Fuel Ferry Flights

With AFLBaseline

WEIGHT AND BALANCE ~ AIRCRAFT LOADING

Item Description Weight Fus. Sta. C.G. Momentlb in % Mac lb-in

Empty Weight (Typical w/AFL w/o APU) 14,747.4 380.37 19.09 5,609,528.40

CrewCaptain: 170.0 144.6 24,582

First Officer: 170.0 144.6 24,582Seat 1: 0.0 204.7Seat 2: 0.0 224.7Seat 3: 0.0 218.9Seat 4: 170.0 257.5 43,775Seat 5: 170.0 257.5 43,775Seat 6: 170.0 301.9 51,323Seat 7: 170.0 301.9 51,323Seat 8: 0.0 333.7

Provision and Baggage:Right hand service cabinet (50 lb max): 10.0 168.0 1,680

Left hand closet (60 lb max): 10.0 170.6 1,706Right hand galley provisions (180 lb max): 30.0 177.0 5,310

Toilet provisions (32 lb max): 5.0 333.0 1,665Sink (35 lb max): 5.0 333.7 1,669

Vanity (20 lb max): 5.0 333.7 1,669Cabin baggage (350 lb max): 150.0 360.0 54,000

Tailcone baggage (300 lb max): 0.0 515.0AFL Fwd Baggage (210 lb max): 0.0 538.9

AFL Aft Baggage (50 lb max): 0.0 609.6

ZERO FUEL WT (MAX 17,000 LB): 15,982 370.19 6.38 5,916,586

Fuel, lb (Max 1180 gal, 7910 lb @ 6.7 lb/gal)Fuselage (Max 748 gal, 5012 lb @ 6.7 lb/gal): 4670.0 427.68 1,997,246

Wings (Max 433 gal, 2898 lb @ 6.7 lb/gal): 2898.0 391.70 1,135,150

RAMP WEIGHT (MAX 23,750 LB): 23,550 384.24 23.9 9,048,983

Loading SummaryTotal Occupant Load (LB): 1020

Provision and Baggage Load (LB): 215Ballast Load (LB): 0

Total Usable Fuel Load (LB): 7568Ramp C.G. (%MAC): 23.92

LEARJET 604 Pax Mission: AFL without APU

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TYPCIAL WORKUP


3. economic consiDerations

a. Possible Ballast installations

Two individual ballast systems have been designed and are available as options at time of installation if desired or needed. These are typically more useful for airplanes with an APU installed, and are useful for ferry flights and for flights with one or two passengers sitting in the far aft cabin seats.

A permanent forward ballast system is mounted far forward in the avionics bay, where an avionics mount-ingplatformisreplacedwithoneofstainlesssteel,weighing75pounds.Thisisforusewhenmostallflights are made with little to no payload, either passengers or cargo.

A removable flight-specific ballast box is mounted transversely across the seat rails at their forward-most location in the cabin. Lead weights with combined weights as high as 200 pounds can be placed in this ballast box.

B. Fuel consumption considerations

Theeffectonrangeoftheincreasedairplaneweightof276poundsisnegligiblebutpositive.Theaero-dynamics of the locker shape has been designed using Computational Fluid Dynamics (CFD) to decrease the drag of the airplane as much as possible. This positive effect has been measured directly in flight tests, and amounts to a little over 1% at the same CG.

The effect of the aft shift in CG due to the empty weight addition of the AFL brings about another 2% due to reduced horizontal tail trim drag. This too has been quantitatively measured in flight test.

The combination of these two effects compensates for the increased basic operating weight due to the AFL. The net result is no measurable compromise in payload-range.

c. resale implications

The addition of the Aft Fuselage Locker increases the operational flexibility of the Lear 60 and makes it more adaptable to higher density seating without having to carry luggage in the cabin.

The number of Learjet 60/60XR airplanes equipped with the AFL will increase over time, but will take 10 or more years to penetrate the available market. In the meantime, demand will far exceed supply, making these AFL-equipped Lear 60s very desirable in the resale marketplace.


4. FreqUently askeD qUestions

We know you’re going to have questions, and we are here to answer them in as much detail as you need. Here is a list of some possible questions you might have. If you have further questions, feel free to call

[email protected].

Q: What is the temperature of locker during cruise?

A: The same as the existing external baggage compartment, and never lower than 10 degrees F at altitude.

Q: How easy is it to load the locker?

A: The AFL is positioned directly onto the lower aft portion of the aircraft fuselage, allowing you to enjoy easy access when loading and unloading baggage and cargo. Minimal bending and no kneeling are required.

Q: Will the locker leak in flight or when it rains?

A: No, the AFL does not leak. The locker has been leak tested during the certification process. In addition to rigorous testing, our past experience with Lear 30 lockers has allowed us to engineer waterproof solutions with confidence. The two access doors on the Lear 60 AFL have rubber seals that protect the locker from moisture. Provisions have also been made for capturing moisture coming from the tail cone and re-routing it directly overboard.

Q: Does the AFL compromise aircraft performance?

A: No compromise. In fact, airplane drag is reduced through aft-body shaping and aft CG shift (reducedtrimdrag)tomorethancompensatefortheincreasedairplaneweightof276pounds.

Q: What is the return on investment on this product?

A: It should be positive. If a buyer wants or needs the increase airplane capabilities of an AFL-equipped Lear 60, he can buy on so-equipped or get his own. The AFL itself is not inclined to wear out and is not subject to fatigue, so its lifetime is as long as the airplane itself.

Q: How do we handle the CG shift?

A: The aft shift of the BOW CG is, inmost cases, advantageous to loading. The Basic Lear 60,particularly those without an APU, tends to load out the front of the forward CG limit. This required the carrying of ballast back where the locker is now installed in order to keep the airplane safe, legal and within CG limits.

Q: Does the locker add inspection time?

A: Only nominally. There are periodic inspections for fire detection and door locking features. All such requirements are documented and woven into the normal inspection periods and requirements for the Lear 60.


5. execUtive sUmmary

“The engineers at Raisbeck Engineering have worked continuously on the Lear 60 Aft Fuselage Locker Project

since January 2009, a time span of five and a half years. The personal energy of our team has poured into this

effort from its very beginning. I am very proud of their successful efforts to bring you the very best, no-com-

promise system that ingenuity can bring, not to mention the financial investment such a program represents.

It’s here now, and ready to serve you in the same way our other Learjet Systems have since our first offering,

the Raisbeck Mark II Wing for the Learjet family in 1974. Thank you for your continued patronage of the long

string of Raisbeck Performance Systems.”

James D. raisbeckFounder&CEO

Raisbeck Engineering, Inc

raisbeck learjet 60 aft fuselage locker · luggage and cargo! the forward compartment is 8 feet...

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